SFI SYSTEM, Diagnostic DTC:P1603, P1605

DTC Code	DTC Name
P1603	Engine Stall History
P1605	Rough Idling

DESCRIPTION

P1603

After starting the engine, this DTC is stored when the engine stops without the ignition switch being operated.

Using the intelligent tester, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle has run out of fuel in the past before performing troubleshooting, as this DTC is also stored when the engine stalls due to running out of fuel.

DTC No.	DTC Detection Condition	Trouble Area
P1603	After monitoring for startability problems (P1604) finishes and 5 seconds or more elapse after starting the engine, with the engine running, the engine stops (the engine speed drops to 200 rpm or less) without the ignition switch being operated for 0.5 seconds or more (1 trip detection logic).	Air leak in intake system Purge VSV Brake booster hose not connected properly Mass air flow meter sub-assembly Engine coolant temperature sensor Wire harness or connector Air fuel ratio sensor (sensor 1) Power supply circuit (purge VSV, fuel injector assembly, ignition coil assembly) Fuel pump Fuel pump control system Fuel line (fuel filter, pipes and hoses) Throttle with motor body assembly Camshaft timing oil control valve assembly Air conditioning system Power steering system Electrical load signal system A/T system Park/Neutral position switch assembly Thermostat ECM

P1605

This DTC is stored if the engine speed drops below the set speed.

It is necessary to check if the vehicle has run out of fuel in the past before performing troubleshooting, as this DTC is also stored when idling is unstable due to running out of fuel.

DTC No.	DTC Detection Condition	Trouble Area
P1605	After 5 seconds or more elapse after starting the engine, with the engine running, the engine speed drops to 400 rpm or less (1 trip detection logic).	Air leak in intake system Purge VSV Brake booster hose not connected properly Mass air flow meter sub-assembly Engine coolant temperature sensor Wire harness or connector Air fuel ratio sensor (sensor 1) Power supply circuit (purge VSV, fuel injector assembly, ignition coil assembly) Fuel pump Fuel pump control system Fuel line (fuel filter, pipes and hoses) Throttle with motor body assembly Camshaft timing oil control valve assembly Knock control sensor Ignition coil assembly (No. 1 to No. 4 cylinder) Fuel injector assembly Spark plug(s) Air conditioning system Power steering system Electrical load signal system A/T system Park/Neutral position switch assembly ECM

Reference waveforms showing a normal cold engine start
Reference waveforms showing a normal warm engine start

Reference values when there is an air leak in the intake system during rough idling

Freeze Frame Data P1605 Rough Idling
Parameter	-3	-2	-1	0	1	Unit
Engine Speed	533	516	612	420	416	rpm
Calculate Load	39.2	40.0	40.0	41.1	42.3	%
Vehicle Load	24.7	27.0	16.8	40.7	35.2	%
MAF	3.56	3.75	2.81	4.59	3.93	gm/sec
Atmosphere Pressure	14.5	14.5	14.5	14.5	14.5	psi(gauge)
Coolant Temp	189	189	189	189	189	F
Intake Air	109	109	109	109	109	F
Battery Voltage	13.105	13.144	13.359	12.949	12.910	V
Throttle Sensor Volt %	17.2	15.6	15.2	16.8	16.4	%
Throttl Sensor #2 Volt %	49.4	47.4	47.0	49.0	48.6	%
Throttle Sensor Position	0.0	0.0	0.0	0.0	0.0	%
Throttle Motor DUTY	17.6	15.2	15.2	15.2	16.8	%
Injector (Port)	4160	4194	4056	4979	5042	μs
Injection Volum (Cylinder 1)	0.175	0.175	0.228	0.228	0.228	ml
Fuel Pump/Speed Status	ON	ON	ON	ON	ON
EVAP (Purge) VSV	0.0	0.0	0.0	0.0	0.0	%
Evap Purge Flow	0.0	0.0	0.0	0.0	0.0	%
Purge Density Learn Value	0.000	0.000	0.000	0.000	0.000
EVAP Purge VSV	OFF	OFF	OFF	OFF	OFF
Target Air-Fuel Ratio	0.999	0.999	0.999	0.999	0.999
AF Lambda B1S1	1.232	1.232	1.232	1.232	1.232
AFS Voltage B1S1	4.996	4.996	4.996	4.996	4.996	V
O2S B1S2	0.000	0.000	0.000	0.000	0.000	V
Short FT #1	18.750	18.750	18.750	18.750	18.750	%
Long FT #1	3.906	3.906	3.906	3.906	3.906	%
Total FT #1	0.000	0.000	0.000	0.000	0.000
Fuel System Status #1	CL	CL	CL	CL	CL
IGN Advance	15.0	14.0	14.5	15.0	0.5	deg
Knock Feedback Value	-3.0	-3.0	-3.0	-3.0	-3.0	°CA
Knock Correct Learn Value	19.0	19.0	19.0	19.0	19.0	°CA
VVT Control Status #1	OFF	OFF	OFF	OFF	OFF
Starter Signal	Close	Close	Close	Close	Close

WIRING DIAGRAM

Refer to DTC P0031 for the air fuel ratio sensor circuit Click here.

Refer to DTC P0351 for the ignition coil assembly circuit Click here.

Refer to DTC P0443 for the purge VSV circuit Click here.

Refer to Fuel Pump Control Circuit Click here.

Refer to Fuel Injector Circuit Click here.

INSPECTION PROCEDURE

Tech Tips

In contrast to normal malfunction diagnosis for components, circuits and systems, DTCs P1603 and P1605 are used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as engine stall.

As these DTCs can be stored as a result of certain user actions, even if these DTCs are output, if the customer makes no mention of problems, clear these DTCs without performing any troubleshooting and return the vehicle to the customer.
If any other DTCs are output, perform troubleshooting for those DTCs first.

Use any information from the customer problem analysis about the condition of the vehicle at the time when the problem occurred (how the engine stopped, conditions when the engine was restarted, etc.) as a reference.

Symptom	Suspected Area
Engine vibration occurs and engine stops	Air fuel ratio abnormal
Engine stops with no engine vibration	Ignition system, injection stoppage, high load from external parts
Engine can be started with accelerator pedal depressed	Insufficient air volume
Rough idling after engine started	Air fuel ratio abnormal, abnormal combustion

Read freeze frame data using the intelligent tester. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data Click here.
When DTC P1603 (Engine Stall History) is stored, DTC P1605 (Rough Idling) is also stored. When confirming freeze frame data, check DTC P1605. (The ECM stores DTC P1605 first. Therefore, the 5 sets of freeze frame data can be confirmed through DTC P1605, enabling the technician to obtain more information.)
When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
Inspections take into account the fact that the malfunction may not have reoccurred and place emphasis on checking the vehicle conditions present at the time when the malfunction occurred.
When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.

Inspection flow
Using freeze frame data, narrow down the parts to be inspected according to the vehicle conditions at the time when the malfunction occurred.

P1603:

If the engine stalled when the intake air volume was low (during idling or deceleration), there may be a decrease in torque due to an incorrect air fuel ratio, etc.
If the engine stalled when the intake air volume was high (during driving or acceleration), there may be a major malfunction such as continuous misfire due to ignition stoppage, fuel injection stoppage, etc. and the torque drops to zero.

If the engine speed decreased slowly, there may have been a decrease in torque due to an air fuel ratio that was incorrect (by approximately 20 to 30%), etc.
If the engine speed decreased rapidly, there may have been a malfunction such as when the engine misfires almost continuously due to ignition stoppage, fuel injection stoppage, etc., or when the external load increases due to an external part malfunctioning.

If the air fuel ratio was abnormal, there may have been an intake air leak, sensor malfunction, or fuel supply problem.
If the air fuel ratio was normal, the air volume may have been insufficient or the ignition timing may have been incorrect.

P1603 inspection flow: Narrow down the parts to be inspected according to the vehicle conditions at the time when the malfunction occurred (freeze frame data).

Vehicle State	Engine Speed	Suspected Area		Primary Parts to Inspect	Procedure
Idling or decelerating	Slowly decreases and engine stalls	Air fuel ratio abnormal	Air suction	Intake system connections Purge VSV system Brake booster assembly	3 to 6
			Sensor malfunction (value from sensor too lean)	Mass air flow meter sub-assembly Engine coolant temperature sensor Air fuel ratio sensor system	7 to 16
			Sensor malfunction (value from sensor too rich)		25 to 34
			Fuel supply problem	Fuel pump control system Purge VSV system Fuel line ECM	17 to 24
		Intake air volume insufficient	ISC flow rate	Throttle with motor body assembly (ISC valve)	35 to 37
		Intake air volume insufficient	Excessive valve overlap	Camshaft timing oil control valve assembly	38, 39
		Ignition timing incorrect	Does not operate as expected	Engine coolant temperature sensor Knock control sensor Mass air flow meter sub-assembly	40 to 42
	Rapidly decreases and engine stalls	Ignition and injection stops (electrical system malfunction)	Power temporarily cut	Power supply circuit (fuel injector assembly, ignition coil assembly)	43, 44
	Rapidly decreases and engine stalls	External part malfunctioning	Increase in load	Air conditioning system Electrical load signal system Power steering system A/T system Park/Neutral position switch assembly	47 to 50
Accelerating	-	Crankshaft position sensor, camshaft position sensor malfunction	Power temporarily cut	Check DTCs	1
		Mass air flow meter sub-assembly	Foreign matter adhesion	Mass air flow meter sub-assembly	52
		Fuel supply problem	Fuel leak, clog	Fuel pump control system Fuel line	55 to 57
		Ignition and injection stops (electrical system malfunction)	Power temporarily cut	Power supply circuit (fuel injector assembly, ignition coil assembly)	53, 54

P1605:

If the engine speed decreased slowly, there may have been a decrease in torque due to an air fuel ratio that was incorrect (by approximately 20 to 30%), etc.
If the engine speed decreased rapidly, there may have been a malfunction such as when the engine misfires almost continuously due to ignition stoppage, fuel injection stoppage, etc., or when the external load increases due to an external part malfunctioning.

If the air fuel ratio was abnormal, there may have been an intake air leak, sensor malfunction, or fuel supply problem.
If the air fuel ratio was normal, the air volume may have been insufficient or the ignition timing may have been incorrect.

P1605 inspection flow: Narrow down the parts to be inspected according to the vehicle conditions at the time when the malfunction occurred (freeze frame data).

Engine Speed	Suspected Area		Primary Parts to Inspect	Procedure
Slowly decreases	Air fuel ratio abnormal	Air suction	Intake system connections Purge VSV system Brake booster	3 to 6
		Sensor malfunction (value from sensor too lean)	Mass air flow meter sub-assembly Engine coolant temperature sensor Air fuel ratio sensor system	7 to 16
		Sensor malfunction (value from sensor too rich)		25 to 34
		Fuel supply problem	Fuel pump control system Purge VSV system Fuel line ECM	17 to 24
	Intake air volume insufficient	ISC flow rate	Throttle with motor body assembly (ISC valve)	35 to 37
	Ignition timing incorrect	Does not operate as expected	Knock control sensor Engine coolant temperature sensor Mass air flow meter sub-assembly	40 to 42
Rapidly decreases	Ignition and injection stops (electrical system malfunction)	Power temporarily cut	Power supply circuit (fuel injector assembly, ignition coil assembly)	43, 44
Rapidly decreases	External part malfunctioning	Increase in load	Air conditioning system Power steering system A/T system Park/Neutral position switch assembly	47 to 50

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1603 AND/OR P1605)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs Click here.

Result
Result	Proceed to
DTC P1603 and/or P1605 is output	A
DTC P1603 or P1605 and other DTCs are output	B

GO TO DTC CHART Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Problem Symptom	Freeze Frame Data Item			Suspected Area	Proceed to
Problem Symptom	Closed Throttle Position SW	Engine Speed	Total of Short FT #1 and Long FT #1	Suspected Area	Proceed to
When idling or decelerating, engine speed slowly decreases (and engine stalls)	All 5 sets of freeze frame data are ON	Decreases slowly*1	All 5 sets of freeze frame data are +15% or higher*2	Air suction Sensor malfunction (value from sensor too lean) Fuel supply problem	A
			At least 1 of the 5 sets of freeze frame data is -15% or less*3	Sensor malfunction (value from sensor too rich)	B
			All 5 sets of freeze frame data are between -15% and +15%	Intake air volume insufficient Ignition timing incorrect	C
When idling or decelerating, engine speed rapidly decreases (and engine stalls)		Decreases rapidly*1	-	Injection stoppage, ignition stoppage Load from external parts	D
When accelerating or driving at constant speed, engine stalls*4	At least one is OFF	-	-	Sensor malfunction Injection stoppage, ignition stoppage Fuel supply problem	E

Tech Tips

*1: A rapid decrease in engine speed may be caused by an electrical fault in the shared wiring of all or a number of cylinders, an increase in load from external parts, etc. The engine speed is considered to have decreased rapidly if either of the following conditions applies.

Otherwise, the engine speed is considered to have decreased slowly.

In the freeze frame data, the decrease in engine speed from #3 to #5 is 400 rpm or higher.
In the freeze frame data, the engine speed at #5 is 120 rpm or less.

If the vehicle speed is 15 km/h (9 mph) or less and the difference between Engine Speed and SPD (NT) is 100 rpm or less, inspect the automatic transaxle. (Depending on the rate of vehicle deceleration, the engine speed may have decreased due to the A/T lock-up release being late.)
*2: When a DTC is stored, feedback compensation increases because the air fuel ratio is determined to be lean.
*3: When a DTC is stored, feedback compensation decreases because the air fuel ratio is determined to be rich.
*4: This item should be checked when DTC P1603 is output and is not necessary to check when only P1605 is output.

READ FREEZE FRAME DATA Click here

CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40) Click here

READ FREEZE FRAME DATA Click here

CHECK INTAKE SYSTEM
1. Check for air leaks in the intake system (vacuum hose disconnection, cracks, damaged gaskets, etc.) Click here.
  Tech Tips
  - If the accelerator pedal is released after racing the engine, the inspection is easier to perform because the vacuum inside the intake pipes increases and the air suction noise becomes louder.
  - If Short FT #1 and Long FT #1 are largely different from the normal values when idling (the intake air volume is small) and almost the same as the normal values when racing the engine (the intake air volume is high), air leaks may be present.
  OK
  
  There is no air leaks.
  
  Tech Tips
  
  Perform "Inspection After Repair" after repairing or replacing the intake system Click here.
NG
REPAIR OR REPLACE INTAKE SYSTEM

OK

OK
There is no air leaks.

CHECK PURGE VSV

Text in Illustration
*1	Fuel Vapor Feed Hose (to Canister)
*2	Connector
*3	Purge VSV

Disconnect the fuel vapor feed hose (on the canister side) of the purge VSV.

Start the engine.
Idle the engine.
Disconnect the connector of the purge VSV.
Check if air flows through the purge VSV.

OK

Air does not flow.

Tech Tips

When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear the DTCs Click here.

OK
Air does not flow.

INSPECT PURGE VSV Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Stop Light Switch	At least 1 of the 5 sets of freeze frame data is ON	Air suction from brake booster assembly	A
Stop Light Switch	All 5 sets of freeze frame data are OFF	-	B

READ FREEZE FRAME DATA Click here

READ VALUE USING INTELLIGENT TESTER (SHORT FT #1)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Start the engine and warm it up until the engine coolant temperature stabilizes.

Tech Tips

The A/C switch and all accessory switches should be off.
Idle the engine.

Using the tester, read [Short FT #1] of the Data List while depressing the brake pedal.

Standard
Short FT #1 changes by 10% or less.

Result
Result	Proceed to
OK	A
NG (for LHD)	B
NG (for RHD)	C

Tech Tips

Even if the results are normal, the brake booster assembly may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the brake booster assembly (refer to step 58).

When air leaks from the brake booster assembly is present, the feedback compensation increases because the air fuel ratio becomes lean.

It is also possible to perform the airtightness inspection to check the brake booster assembly.

REPLACE BRAKE BOOSTER ASSEMBLY (for LHD) Click here

REPLACE BRAKE BOOSTER ASSEMBLY (for RHD) Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Calculate Load	Below 90% of the current value of the vehicle*1	Mass air flow meter sub-assembly	A
AFS Voltage B1S1	3.3 V or higher*2	Air fuel ratio sensor Wire harness or connector Actual air fuel ratio abnormal	B
Both freeze frame data items listed above	Values are other than above	-	C

Tech Tips

Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
*1: If the mass air flow meter sub-assembly is malfunctioning, the freeze frame data will show a low engine load value.
*2: If the air fuel ratio sensor is malfunctioning and constantly outputs a value indicating the air fuel ratio is lean, the actual air fuel ratio will become rich and the engine may stall.

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE INJECTION VOLUME) Click here

READ FREEZE FRAME DATA Click here

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Remove the mass air flow meter sub-assembly.

Check for foreign matter in the air flow passage of the mass air flow meter sub-assembly.

Result
Result	Proceed to
Visible foreign matter is present	A
Visible foreign matter is not present	B

Tech Tips

Even if the results are normal, the mass air flow meter sub-assembly may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the mass air flow meter sub-assembly (refer to step 58).
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly Click here.

READ FREEZE FRAME DATA Click here

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE INJECTION VOLUME)

Connect the intelligent tester to the DLC3.
Start the engine.
Turn the tester on.
Warm up the engine.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / All Data / AFS Voltage B1S1 and O2S B1S2.

Change the fuel injection volume using the tester, and monitor the voltage output of the air fuel ratio and heated oxygen sensors displayed on the tester.

Standard

Tester Display	Specified Condition
Control the Injection Volume (12%)	Air fuel ratio sensor output voltage is below 3.1 V
Control the Injection Volume (-12%)	Air fuel ratio sensor output voltage is higher than 3.4 V

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
Even if the results are normal, the air fuel ratio sensor may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the air fuel ratio sensor (refer to step 58).

READ FREEZE FRAME DATA Click here

CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)
1. Check the harnesses and connectors, referring to DTC P0031 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
NG
REPAIR POWER SOURCE CIRCUIT (AIR FUEL RATIO SENSOR POWER SOURCE) Click here

OK
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
1. Check the harnesses and connectors, referring to DTC P2237 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
  - Perform "Inspection After Repair" after replacing the air fuel ratio sensor Click here.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE AIR FUEL RATIO SENSOR Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Proceed to
Initial Engine Coolant Temp, Initial Intake Air Temp	Difference in temperature between each item is below 10°C (18°F)*1	A
Initial Engine Coolant Temp, Initial Intake Air Temp	Difference in temperature between each item is 10°C (18°F) or higher*2	B

Tech Tips

*1: A long time had elapsed after stopping the engine.
*2: A long time had not elapsed after stopping the engine.

READ FREEZE FRAME DATA Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Initial Engine Coolant Temp, Coolant Temp, Engine Run Time	Range A	Engine coolant temperature sensor Thermostat	A
	Range B	Engine coolant temperature sensor	B
	Range C	-	C

Tech Tips

This step is not directly related to engine stall.

INSPECT ENGINE COOLANT TEMPERATURE SENSOR Click here

READ FREEZE FRAME DATA Click here

INSPECT THERMOSTAT

Inspect the thermostat Click here.

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

This step is not directly related to engine stall.

INSPECT ENGINE COOLANT TEMPERATURE SENSOR Click here

REPLACE THERMOSTAT Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Coolant Temp	120°C (248°F) or higher	Engine coolant temperature sensor	A
Coolant Temp	Engine coolant temperature is lower than outside temperature* by 15°C (27°F) or higher	Engine coolant temperature sensor	A
Both freeze frame data items listed above	Values are other than above	-	B

Tech Tips

*: Use an actual outside temperature estimated from the Initial Intake Air, Ambient Temp for A/C, and (if possible) the weather when the DTC was detected.

READ FREEZE FRAME DATA Click here

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Inspect the engine coolant temperature sensor Click here.

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

Even if the results are normal, the engine coolant temperature sensor may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the engine coolant temperature sensor (refer to step 58).
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor Click here.

READ FREEZE FRAME DATA Click here

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
EVAP (Purge) VSV	At least 1 of the 5 sets of freeze frame data is not 0%	Purge VSV	A
EVAP (Purge) VSV	All 5 sets of freeze frame data are 0%	-	B

Tech Tips

If the purge VSV is stuck closed, air fuel ratio compensation by the purge VSV is incorrectly adjusted, and then the air fuel ratio becomes lean and the engine may stall.

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP / SPEED) Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE VSV FOR EVAP CONTROL)

Text in Illustration
*1	Purge VSV
*2	Fuel Vapor Feed Hose (to Canister)

Disconnect the fuel vapor feed hose (on the canister side) of the purge VSV.

Connect the intelligent tester to the DLC3.
Start the engine.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

Operate the purge VSV and check the air flow.

Activate the VSV for Evap Control	Specified Condition
ON	Air flows
OFF	Air does not flow

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
Even if the results are normal, the purge VSV may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the purge VSV (refer to step 58).

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP / SPEED) Click here

INSPECT PURGE VSV
1. Inspect the purge VSV Click here.
NG
REPLACE PURGE VSV Click here

OK
CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)
1. Check the harnesses and connectors, referring to DTC P0443 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
NG
REPAIR POWER SOURCE CIRCUIT (PURGE VSV POWER SOURCE) Click here

OK
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
1. Check the harnesses and connectors, referring to DTC P0443 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE ECM Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP / SPEED)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

When performing the Active Test, check for an operating sound from the fuel pump.

Control the Fuel Pump / Speed	Specified Condition
ON	Operating sound heard
OFF	Operating sound not heard

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
While performing the Active Test, make sure that there is no fuel leakage from the pipes, no signs that fuel has leaked, and no fuel smell.
If the fuel pump operating noise is abnormal, proceed to step 23.

CHECK FUEL SYSTEM Click here

INSPECT FUEL PUMP (RESISTANCE)
1. Inspect the fuel pump Click here.
  
  Tech Tips
  
  Perform "Inspection After Repair" after replacing the fuel pump Click here.
NG
REPLACE FUEL PUMP Click here

OK

CHECK FUEL PUMP CONTROL CIRCUIT Click here

CHECK FUEL SYSTEM

Check for foreign matter such as iron particles around the fuel pump, and for signs that the fuel pump was stuck.

Result
Result	Proceed to
There is foreign matter or signs that fuel pump was stuck	A
There is no foreign matter and no signs that fuel pump was stuck	B

Tech Tips

If there is foreign matter such as iron particles on the fuel pump, remove the foreign matter.

REPLACE MALFUNCTIONING PARTS Click here

REPAIR OR REPLACE FUEL SYSTEM

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Calculate Load	110% or higher of the current value of the vehicle*1	Mass air flow meter sub-assembly	A
AFS Voltage B1S1	Below 3.3 V*2	Air fuel ratio sensor Harness and connector Actual air fuel ratio abnormal	B
Both freeze frame data items listed above	Values are other than above	-	C

Tech Tips

Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
*1: If the mass air flow meter sub-assembly is malfunctioning and incorrectly measures the intake air volume to be higher than the actual volume of air flowing through the intake manifold, the freeze frame data will show a high engine load value.
*2: As the air fuel ratio sensor output is low before the sensor warms up, the value at that time cannot be used for diagnosis. If the air fuel ratio sensor is malfunctioning and constantly outputs a value indicating the air fuel ratio is rich, the actual air fuel ratio will become lean and the engine may stall.

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE INJECTION VOLUME) Click here

READ FREEZE FRAME DATA Click here

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Remove the mass air flow meter sub-assembly.

Check for foreign matter in the air flow passage of the mass air flow meter sub-assembly.

Result
Result	Proceed to
Visible foreign matter is present	A
Visible foreign matter is not present	B

Tech Tips

Even if the results are normal, the mass air flow meter sub-assembly may have been malfunctioning. Continue this inspection procedure until step 34, and if there are no problems with other parts, replace the mass air flow meter sub-assembly (refer to step 58).
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly Click here.

READ FREEZE FRAME DATA Click here

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE INJECTION VOLUME)

Connect the intelligent tester to the DLC3.
Start the engine.
Turn the tester on.
Warm up the engine.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / All Data / AFS Voltage B1S1 and O2S B1S2.

Change the fuel injection volume using the tester, and monitor the voltage output of the air fuel ratio and heated oxygen sensors displayed on the tester.

Standard

Tester Display	Specified Condition
Control the Injection Volume (12%)	Air fuel ratio sensor output voltage is below 3.1 V
Control the Injection Volume (-12%)	Air fuel ratio sensor output voltage is higher than 3.4 V

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
Even if the results are normal, the air fuel ratio sensor may have been malfunctioning. Continue this inspection procedure until step 34, and if there are no problems with other parts, replace the air fuel ratio sensor (refer to step 58).

READ FREEZE FRAME DATA Click here

CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)
1. Check the harnesses and connectors, referring to DTC P0031 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
NG
REPAIR POWER SOURCE CIRCUIT (AIR FUEL RATIO SENSOR POWER SOURCE) Click here

OK
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
1. Check the harnesses and connectors, referring to DTC P2237 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
  - Perform "Inspection After Repair" after replacing the air fuel ratio sensor Click here.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE AIR FUEL RATIO SENSOR Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Proceed to
Initial Engine Coolant Temp, Initial Intake Air Temp	Difference in temperature between each item is below 10°C (18°F)*1	A
Initial Engine Coolant Temp, Initial Intake Air Temp	Difference in temperature between each item is 10°C (18°F) or higher*2	B

Tech Tips

*1: A long time had elapsed after stopping the engine.
*2: A long time had not elapsed after stopping the engine.

READ FREEZE FRAME DATA Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions present when the DTC was stored which are recorded in the freeze frame data Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Initial Engine Coolant Temp, Coolant Temp, Engine Run Time	Range A	Engine coolant temperature sensor Thermostat	A
	Range B	Engine coolant temperature sensor	B
	Range C	-	C

Tech Tips

This step is not directly related to engine stall.

INSPECT ENGINE COOLANT TEMPERATURE SENSOR Click here

CLEAR DTC Click here

INSPECT THERMOSTAT

Inspect the thermostat Click here.

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

This step is not directly related to engine stall.

INSPECT ENGINE COOLANT TEMPERATURE SENSOR Click here

REPLACE THERMOSTAT Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Coolant Temp	120°C (248°F) or higher	Engine coolant temperature sensor	A
Coolant Temp	Engine coolant temperature is lower than outside temperature* by 15°C (27°F) or higher	Engine coolant temperature sensor	A
Both freeze frame data items listed above	Values are other than above	-	B

Tech Tips

*: Use an actual outside temperature estimated from the Initial Intake Air, Ambient Temp for A/C, and (if possible) the weather when the DTC was detected.

CLEAR DTC Click here

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Inspect the engine coolant temperature sensor Click here.

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

Even if the results are normal, the engine coolant temperature sensor may have been malfunctioning. If there are no problems with other parts, replace the engine coolant temperature sensor (refer to step 58).
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor Click here.

REPLACE MALFUNCTIONING PARTS Click here

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Total of ISC Learning Value and ISC Feedback Value	Below 80% of the current value of the vehicle*1	Throttle with motor body assembly	A
	120% or higher of the current value of the vehicle*2	Throttle with motor body assembly	B
	From 80 to 120% of the current value of the vehicle	-	C

Tech Tips

Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
*1: If the throttle with motor body assembly has a temporary problem in which it cannot fully close, the intake air volume and engine speed increase. As a result, the ISC learning amount becomes less than the standard. At this time, if the throttle with motor body assembly returns to normal and fully closes, the intake air volume will be insufficient and the engine may stall.
*2: If carbon accumulates on the throttle with motor body assembly and the intake air volume decreases, the ISC learning amount is increased to maintain the idle speed. If this situation continues, the ISC learning amount reaches the upper limit, the idle speed cannot be maintained causing idling to become unstable, and the engine may stall.

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT LINEAR) Click here

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

Check for foreign matter and signs that the throttle with motor body assembly was stuck, and also check that the valve and shaft move smoothly during operation.

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

Even if the results are normal, the throttle with motor body assembly may have been malfunctioning. Continue this inspection procedure until step 42, and if there are no problems with other parts, replace the throttle with motor body assembly (refer to step 58).
Perform "Inspection After Repair" after replacing the throttle with motor body assembly Click here.

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT LINEAR) Click here

REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

Check if carbon is in the air flow passage of the throttle with motor body assembly.

Result
Result	Proceed to
Carbon in passage	A
No carbon in passage	B

Tech Tips

Even if the results are normal, the throttle with motor body assembly may have been malfunctioning. Continue this inspection procedure until step 42, and if there are no problems with other parts, replace the throttle with motor body assembly (refer to step 58).
Perform "Inspection After Repair" after replacing the throttle with motor body assembly Click here.

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT LINEAR) Click here

REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT LINEAR)
1. Perform the Active Test, referring to DTC P0011 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - When the results of the inspection using the Active Test are normal but the valve operating noise is abnormal, check the valve for any signs of problems.
  - If the camshaft timing oil control valve assembly (for intake camshaft) is stuck at the advanced side, the valve overlap increases and combustion worsens due to the internal EGR which may cause rough idle or cause the engine to stall.
NG
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE CAMSHAFT) Click here

OK
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT EXHAUST LINEAR)
1. Perform the Active Test, referring to DTC P0014 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - When the results of the inspection using the Active Test are normal but the valve operating noise is abnormal, check the valve for any signs of problems.
  - If the camshaft timing oil control valve assembly (for exhaust camshaft) is stuck at the retard side, the valve overlap increases and combustion worsens due to the internal EGR which may cause rough idle or cause the engine to stall.
NG
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST CAMSHAFT) Click here

OK

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item		Suspected Area	Proceed to
IGN Advance	Knock Correct Learn Value	Suspected Area	Proceed to
Differs from the current value of the vehicle by 10 deg or higher	Below 3°CA	Engine coolant temperature sensor Mass air flow meter sub-assembly Knock control sensor	A
	3°CA or higher	-	B
Differs from the current value of the vehicle by less than 10 deg	-	-	B

Tech Tips

Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
Even if the results are normal, the knock control sensors may have been malfunctioning. If there are no problems with other parts, replace the knock control sensors (refer to step 58).

REPLACE MALFUNCTIONING PARTS Click here

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Inspect the engine coolant temperature sensor Click here.

Result
Result	Proceed to
Normal	A
Abnormal	B

Tech Tips

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor Click here.

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY (INTAKE AIR TEMPERATURE SENSOR)

Inspect the mass air flow meter sub-assembly (intake air temperature sensor) Click here.

Result
Result	Proceed to
Normal	A
Abnormal	B

Tech Tips

Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly or knock control sensor Click here.

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

REPLACE KNOCK CONTROL SENSOR Click here

CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)
1. Check the harnesses and connectors, referring to DTC P0300 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
  - A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
NG
CHECK FUEL INJECTOR CIRCUIT Click here

OK
CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL ASSEMBLY)
1. Check the harnesses and connectors, referring to DTC P0351 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
  - A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
NG
REPAIR IGNITION COIL POWER SOURCE CIRCUIT Click here

OK

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Idle Spark Advn Ctrl (#1 to #4)	At least one cylinder shows a value of 4°CA or higher	Fuel injector system Ignition coil system	A
Idle Spark Advn Ctrl (#1 to #4)	All cylinders show a value of less than 4°CA	-	B

READ FREEZE FRAME DATA Click here

READ VALUE USING INTELLIGENT TESTER (IDLE SPARK ADVN CTRL #)

Change the location of the ignition coil assembly for the cylinder whose Idle Spark Advn Ctrl (#1 to #4) was 4°CA or more in step 45.
Connect the intelligent tester to the DLC3.
Start the engine.

Using the tester, select [Idle Spark Advn Ctrl (#1 to #4)] of the Data List.

Result
Result	Proceed to
Same as result in step 45	A
Different from result in step 45	B

Tech Tips

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
Perform "Inspection After Repair" after replacing the ignition coil assembly Click here.

REPLACE IGNITION COIL ASSEMBLY Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item			Suspected Area	Proceed to
A/C Signal	Air Conditioner FB Val	Power Steering Signal	Suspected Area	Proceed to
A/C Signal display changes from OFF to ON	Value displayed for Air Conditioner FB Val increases	Does not change from OFF	A/C system	B
A/C Signal display changes from OFF to ON	Value displayed for Air Conditioner FB Val increases	Changes from OFF to ON	Power steering system	A
A/C Signal display does not change from OFF	Value displayed for Air Conditioner FB Val does not increase	Changes from OFF to ON	Power steering system
A/C Signal display does not change from OFF		Does not change from OFF	-

Tech Tips

Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
Even if the results are normal, the power steering system or the air conditioning system may have been malfunctioning. Continue this inspection procedure until step 50, and if there are no problems with other parts, inspect the power steering system and the air conditioning system (refer to step 58).

CHECK AIR CONDITIONING SYSTEM Click here

CHECK AUTOMATIC TRANSAXLE ASSEMBLY
1. Start the engine.
2. Move the shift lever to R and confirm that the vehicle can move rearward.
  
  OK
  
  The vehicle can move rearward.
NG
REPLACE AUTOMATIC TRANSAXLE ASSEMBLY Click here

OK

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item				Suspected Area	Proceed to
Electrical Load Signal 1 (3)	Electric Load Feedback Val	Difference between Engine Speed and SPD (NT)	Vehicle Speed	Suspected Area	Proceed to
Electrical Load Signal 1 (3) display changes from OFF to ON1, or value displayed for Electric Load Feedback Val increases1	Value displayed for Electric Load Feedback Val changes	-	-	Electrical load signal circuit	A
	Value displayed for Electric Load Feedback Val does not change	At least 1 of the 5 sets of freeze frame data is below 100 rpm	Below 15 km/h (9 mph)	A/T system	B
			15 km/h (9 mph) or more	-	C
		All 5 sets of freeze frame data are 100 rpm or higher	-	-	C
Electrical Load Signal 1 (3) display does not change from OFF, or value displayed for Electric Load Feedback Val does not increase	-	At least 1 of the 5 sets of freeze frame data is below 100 rpm	Below 15 km/h (9 mph)	A/T system	B
			15 km/h (9 mph) or more	-	C
		All 5 sets of freeze frame data are 100 rpm or higher	-	-	C

Tech Tips

*1: If the Electrical Load Signal 1 (3) display changes from OFF to ON or the Electric Load Feedback Val increases, it probably is a malfunction due to a change in electrical load. Check the generator and the continuity and connections between the generator and ECM.
If the vehicle speed is 15 km/h (9 mph) or less and the difference between Engine Speed and SPD (NT) is 100 rpm or less, inspect the automatic transaxle. (Depending on the rate of vehicle deceleration, the engine speed may have decreased due to the A/T lock-up release being late.)
The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
Even if the results are normal, the electrical load signal system and/or the A/T system may have been malfunctioning. Continue this inspection procedure until step 50, and if there are no problems with other parts, inspect the electrical load signal system and/or the A/T system (refer to step 58).

CHECK AUTOMATIC TRANSAXLE SYSTEM Click here

READ FREEZE FRAME DATA Click here

CHECK GENERATOR CIRCUIT Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item		Suspected Area	Proceed to
Shift SW Status (P or N Range)	Neutral Position SW Signal	Suspected Area	Proceed to
P and N position are both OFF in at least one data set	ON when Shift SW Status D or R	Park/neutral position switch	A
P and N position are both OFF in at least one data set	OFF when Shift SW Status D or R	A/T system	B
All 5 sets of freeze frame data are ON	-	-	C

Tech Tips

Even if the results are normal, the park/neutral position switch assembly and/or A/T system may have been malfunctioning. If there are no problems with other parts, inspect the park/neutral position switch assembly and/or A/T system (refer to step 58).

CHECK AUTOMATIC TRANSAXLE SYSTEM Click here

REPLACE MALFUNCTIONING PARTS Click here

CHECK PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

READ FREEZE FRAME DATA

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.

Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

Result
Freeze Frame Data Item	Result	Suspected Area	Proceed to
Throttle Sensor Position, Calculate Load	Calculate Load decreases while Throttle Sensor Position increases	Mass air flow meter sub-assembly	A
Throttle Sensor Position, Calculate Load	Calculate Load does not decrease while Throttle Sensor Position increases	-	B

CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40) Click here

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Remove the mass air flow meter sub-assembly.

Check for foreign matter in the air flow passage of the mass air flow meter sub-assembly.

Result
Result	Proceed to
Visible foreign matter is present	A
Visible foreign matter is not present	B

Tech Tips

Even if the results are normal, the mass air flow meter sub-assembly may have been malfunctioning. Continue this inspection procedure until step 57, and if there are no problems with other parts, replace the mass air flow meter sub-assembly (refer to step 58).
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly Click here.

CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40) Click here

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)
1. Check the harnesses and connectors, referring to DTC P0300 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
  - A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
NG
CHECK FUEL INJECTOR CIRCUIT Click here

OK
CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL ASSEMBLY)
1. Check the harnesses and connectors, referring to DTC P0351 inspection procedure Click here.
  Tech Tips
  - Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
  - Make sure there is not an excessive amount of force applied to the wire harness.
  - A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
NG
REPAIR IGNITION COIL POWER SOURCE CIRCUIT Click here

OK

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP / SPEED)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

When performing the Active Test, check for an operating sound from the fuel pump.

Control the Fuel Pump / Speed	Specified Condition
ON	Operating sound heard
OFF	Operating sound not heard

Result
Result	Proceed to
Abnormal	A
Normal	B

Tech Tips

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
While performing the Active Test, make sure that there is no fuel leakage from the pipes, no signs that fuel has leaked, and no fuel smell.
If the fuel pump operating noise is abnormal, proceed to step 57.

CHECK FUEL SYSTEM Click here

INSPECT FUEL PUMP
1. Inspect the fuel pump Click here.
  
  Tech Tips
  
  Perform "Inspection After Repair" after replacing the fuel pump Click here.
NG
REPLACE FUEL PUMP Click here

OK

CHECK FUEL PUMP CONTROL CIRCUIT Click here

CHECK FUEL SYSTEM

Check for foreign matter such as iron particles around the fuel pump, and for signs that the fuel pump was stuck.

Result
Result	Proceed to
There is foreign matter or signs that fuel pump was stuck	A
There is no foreign matter and no signs that fuel pump was stuck	B

Tech Tips

If there is foreign matter such as iron particles on the fuel pump, remove the foreign matter.

REPLACE MALFUNCTIONING PARTS Click here

REPAIR OR REPLACE FUEL SYSTEM

REPLACE MALFUNCTIONING PARTS

If the malfunction could not be identified in steps 3 to 24, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

Performed Step	Inspection or Part to Replace
Step 6	Brake booster assembly replacement
Step 8	Mass air flow meter sub-assembly replacement
Step 9	Air fuel ratio sensor replacement
Step 16	Engine coolant temperature sensor replacement
Step 18	Purge VSV replacement
Step 24	Fuel pump replacement

If the malfunction could not be identified in steps 25 to 34, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

Performed Step	Inspection or Part to Replace
Step 26	Mass air flow meter sub-assembly replacement
Step 27	Air fuel ratio sensor replacement
Step 34	Engine coolant temperature sensor replacement

If the malfunction could not be identified in steps 35 to 42, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

Performed Step	Inspection or Part to Replace
Step 36, 37	Throttle with motor body assembly replacement
Step 40	Knock control sensor replacement

If the malfunction could not be identified in steps 43 to 50, inspect and repair the part which is suspected to be malfunctioning according to the step where an inspection was performed.

Performed Step	Inspection or Part to Replace
Step 47	A/C system inspection and repair Power steering system inspection and repair
Step 48	A/T system inspection and repair
Step 49	Electrical load signal system inspection and repair A/T system inspection and repair
Step 50	Park/neutral position switch inspection and repair A/T system inspection and repair

If the malfunction could not be identified in steps 51 to 57, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

Performed Step	Inspection or Part to Replace
Step 52	Mass air flow meter sub-assembly replacement

Tech Tips

Referring to the chart, inspect and repair or replace the part from the step where an inspection was performed.
Perform "Inspection After Repair" after replacing or servicing parts related to engine operation. Refer to detailed information in Initialization Click here.

CLEAR DTC
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Clear the DTCs Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
1. Check if engine stall symptoms are present.
  
  Tech Tips
  
  If any engine stall symptoms are present, recheck for DTCs and freeze frame data and perform an inspection.
NG
REPAIR OR REPLACE MALFUNCTIONING PARTS

OK

END