This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.
Using the GTS, 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 ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
MIL
Memory
P1604
Startability Malfunction
Either of the following conditions is met (1 trip detection logic):
The engine speed is below 500 rpm with the STA signal on for a certain amount of time.
In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty.
As the DTC can be stored as a result of certain user actions, even if the DTC is output, if the customer makes no mention of problems, clear the DTC without performing any troubleshooting and return the vehicle to the customer.
If any other DTCs are output, perform troubleshooting for those DTCs first.
When the Data List item "Immobiliser Fuel Cut" is ON, the engine cannot be started.
Read freeze frame data using the GTS. 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.
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 start the engine under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and compare it with the freeze frame data.
If the malfunction does not reoccur, carefully check the vehicle conditions from when the malfunction occurred using freeze frame data.
When performing inspections, jiggle the relevant wire harness and connectors in an attempt to reproduce malfunctions that do not always occur.
If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.
Malfunction Recurrence and Inspection Areas
Freeze frame data exists, but the malfunction has not reoccurred and the malfunction conditions are unknown.
The engine speed recorded in the freeze frame data is 0 rpm (the engine does not crank).
Tip:
One of the following problems may be present: battery depletion, excess engine friction, a starter malfunction or a crankshaft position sensor malfunction.
If the battery voltage is less than 6 V during cranking, there is a high probability that engine friction is abnormal.
If the battery voltage drops to 5 V or less when starting the engine, the battery may be malfunctioning.
If the battery voltage fluctuates while cranking the engine, it can be concluded that cranking is being performed. When the engine speed is 0 rpm, the crankshaft position sensor and/or an ECM may be malfunctioning.
All engine speeds recorded in the freeze frame data are between 60 and 250 rpm (the engine cranks but there is no combustion).
Tip:
If the engine speed is between 60 and 250 rpm (no initial combustion), there may be a wiring problem or a complete failure of an ignition or fuel system part.
Due to a engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and the engine may not be able to be started.
The engine speed recorded in the freeze frame data is 250 rpm or higher (the initial combustion and starter turnoff occur late).
Tip:
If the engine speed is 250 rpm or higher (combustion occurs but the initial combustion and starter turnoff timing is too late), the fuel injection volume is often incorrect (too low or too high) and determining the cause of the malfunction is often difficult.
Due to an engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and engine starting trouble may occur.
If Long FT is incorrect, there may be a fuel supply problem due to the injectors or fuel pump being clogged, etc.
If the engine cranking speed is high, compression loss may have occurred due to carbon interfering with the valve operation.
When the malfunction (starting difficulty) can be reproduced, or malfunction conditions are known, perform the following inspections ("Problem symptoms" and "Systems to inspect").
Problem symptoms
The engine does not crank.
Tip:
The starter is normal if a noise that indicates the starter pinion gear is extending is heard. The battery may be fully depleted or there may be excess engine friction.
The engine cranking speed is abnormal.
Tip:
If the engine cranking speed is high, compression loss may have occurred because carbon interfered with valve operation, etc.
There is no initial combustion.
Tip:
If there is no initial combustion, there is probably a wiring problem or an ignition or fuel system part malfunction.
The engine stalls after starter turnoff.
Tip:
If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the VVT may have a problem returning.
The initial combustion and starter turnoff occur late.
Tip:
If the initial combustion and starter turnoff occur late, the fuel injection volume is probably incorrect (too low or too high).
Causes of fuel system malfunctions according to conditions present at the time of the malfunction.
When 2 to 3 minutes have elapsed after stopping the engine: Fuel pressure loss due to the pressure regulator failing to maintain the fuel pressure.
When 15 to 120 minutes have elapsed after stopping the engine: Problem with injector fuel seal.
When a long time has elapsed after stopping the engine: pressure regulator is stuck open.
Systems to inspect.
Intake system
Ignition system
Fuel system
INSPECTION FLOW
Freeze frame data exists, but the malfunction has not reoccurred and the malfunction conditions are unknown.
Freeze Frame Data Item
Result
Suspected Area
Procedure
Engine Speed
0 rpm (no engine cranking at all)
Battery fully depleted
Engine assembly (excess friction)
Starter assembly
Immobiliser system
Crankshaft position sensor
ECM
4 to 9
60 to 250 rpm (engine cranks but no initial combustion*1)
Fuel pump control system
Ignition system
Engine coolant temperature sensor
Fuel injection system
10 to 14
250 rpm or higher (combustion occurs but initial combustion and starter turnoff*2 occur late)
Engine assembly (compression loss)
Fuel injection system
Fuel pump control system
15 to 23
Tip:
*1: First combustion after cranking begins.
*2: Condition when engine speed increases and starter can be turned off.
When vehicle conditions can be reproduced, or when malfunction conditions are known.
Problem symptoms
Problem Symptom
Suspected Area
Suspected Component
Procedure
The engine does not crank
Battery malfunction
Battery fully depleted
26 to 31
Starting system
Starter assembly (includes pinion gear wear or tooth damage)
Starter system
Immobiliser system
Immobiliser system
Engine assembly
Engine assembly (excess friction)
Flywheel wear or tooth damage
Cranking speed too low
Battery malfunction
Battery fully depleted
32 to 34
Starting system
Starter assembly
Engine assembly
Engine assembly (excess friction)
Cranking speed too high
Engine assembly
Engine assembly (compression loss)
There is no initial combustion
Fuel supply problem
Maintenance of fuel pressure by pressure regulator
Fuel injector leak
Fuel leak from fuel line
Fuel pump control system
Fuel pump
35 to 48
Ignition system malfunction
Spark plug
Crankshaft position sensor
No. 1 ignition coil
Engine stalls after starter turnoff
Air suction
Intake system connections
49 to 56
Deposits in throttle body
Throttle body with motor assembly
VVT valve does not return properly
Camshaft timing oil control valve assembly
Manifold absolute pressure sensor malfunction
Manifold absolute pressure sensor
EGR valve does not close properly
EGR valve assembly
The initial combustion and starter turnoff occur late
Engine coolant temperature sensor malfunction
Engine coolant temperature sensor
57 to 69, 75
Manifold absolute pressure sensor malfunction
Manifold absolute pressure sensor
Abnormal A/F learning value
Heated oxygen sensor (sensor 1)
Deviation from fuel injection characteristics
Fuel injector assembly
Wet-fouled or dry-fouled spark plug
Spark plug
Lack of fuel pressure
Pressure regulator
Fuel pump
Fuel pump control system
Systems to inspect
Problem Symptom
Suspected Area
Suspected Components
Procedure
Fuel system troubleshooting A
Abnormal A/F learning value
Fuel injector assembly
85 to 92
93 to 100
Rough idling
Crankshaft position sensor
Abnormal fuel pressure
Fuel
Fuel leak from fuel line
Fuel pump
Pressure regulator
Fuel system troubleshooting B
Abnormal concentration of HC in surge tank
Purge VSV system
Fuel injector assembly
101 to 103
Fuel system troubleshooting C
Injection signal system malfunction
Fuel injector assembly
Crankshaft position sensor
Camshaft position sensor
ECM
71 to 74
Intake system troubleshooting
Difference between ISC target value and opening angle when idling
Engine assembly (compression loss)
Valve timing
Engine coolant temperature sensor
ECM
82 to 84
104 to 106
Ignition system troubleshooting
Camshaft and/or crankshaft position sensor signal malfunction
Crankshaft position sensor system (including sensor installation)
Camshaft position sensor system (including sensor installation)
ECM
76 to 81
107 to 112
Note:
After replacing the ECM and/or throttle body with motor assembly, perform electronic throttle learning and idle learning.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Immobiliser Communication.
Powertrain > Engine and ECT > Data List
Tester Display
Immobiliser Communication
Check the Data List indication.
OK
Data List Item
GTS Display
Immobiliser Communication
ON
Tip:
If the engine is started immediately after reconnecting the battery terminal, the engine may stall immediately after it starts due to the intercommunication process between each ECU. For this reason, when starting the engine after reconnecting the battery terminal, first turn the ignition switch to ON and then wait several seconds for the communication process to complete before starting the engine.
When this operation causes DTC P1604 to be stored, this is due to normal operation of the immobiliser system and does not indicate a malfunction, so clear the DTC and return the vehicle to the customer.
60 to 250 rpm (engine cranks but no initial combustion)
-
Fuel pump control system
Ignition system
Engine coolant temperature sensor
Immobiliser system
Fuel injection system
C
250 rpm or higher (combustion occurs but initial combustion and starter turnoff occur late)
-
Engine assembly
Fuel injection system
Fuel pump control system
D
Result
Freeze Frame Data Item
Suspected Area
Proceed to
Low Rev for Eng Start
ON exists
Intake system connections
Throttle body with motor assembly
Camshaft timing oil control valve assembly
Manifold absolute pressure sensor
E
Tip:
When DTC P1604 is stored, either "Engine Start Hesitation"*1 or "Low Rev for Eng Start"*2 in the Freeze Frame Data will be ON. If "Low Rev for Eng Start" is ON, Proceed to E.
*1: This value turns ON when the engine speed does not reach a certain value for a certain period of time when starting the engine.
*2: This value turns ON when the engine stalls immediately after starting the engine. If "Low Rev for Eng Start" is ON, as there is a possibility that the low engine speed or engine stall was caused by the user, confirm the following freeze frame data items.
Minimum voltage is 6 V or higher and voltage does not fluctuate*1
Starter system
A
Minimum voltage is 6 V or higher and voltage fluctuates*2, *3
Crankshaft position sensor system
ECM
B
Minimum voltage is 5 to 6 V*4
Excess engine friction
Battery fully depleted
C
Tip:
*1: The 5 sets of freeze frame data show approximately the same battery voltage.
*2: The 5 sets of freeze frame data show different battery voltages.
*3: If the voltage fluctuates, it can be determined that cranking is being performed normally. When the engine speed is 0 rpm, the crankshaft position sensor system and/or the ECM may be malfunctioning.
*4: There may be excess engine friction. Make sure that the crankshaft rotates smoothly when turning it by hand. Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.
Difference between Coolant Temp and Intake Air is 10°C (18°F) or more*1
Coolant Temp is 125°C (257°F) or more, or lower than ambient temperature*3 by 15°C (27°F) or more
-
Engine coolant temperature sensor
A
Other than above
All 5 sets of freeze frame data are ON
-
B
At least 1 of the 5 sets of freeze frame data is OFF
Fuel pump control system
C
Difference between Coolant Temp and Intake Air is less than 10°C (18°F)*2
-
At least 1 of the 5 sets of freeze frame data is OFF
Fuel pump control system
All 5 sets of freeze frame data are ON
-
B
Tip:
*1: A long time had not elapsed after stopping the engine.
*2: A long time had elapsed after stopping the engine.
*3: Use an actual ambient temperature estimated from the Initial Intake Air, Ambient Temp for A/C, and (if possible) the weather when the DTC was detected.
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.
Result
Proceed to
OK
NG
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
Powertrain > Engine and ECT > Active Test
Tester Display
Control the Fuel Pump / Speed
When performing the Active Test, check for fuel leakage from the fuel pipes.
Result
Result
Proceed to
Fuel leakage or signs of fuel leakage are present
A
No fuel leakage or signs of fuel leakage
B
Tip:
Jiggle the fuel hose and connector to increase the likelihood of detecting malfunctions that do not always occur.
When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.
Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
A
REPAIR OR REPLACE FUEL LINE
B
CHECK FUEL SYSTEM
Check for foreign matter such as iron particles around the fuel pump (fuel pump, fuel pump filter, and inside the fuel tank), 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
Difference between Coolant Temp and Intake Air is 10°C (18°F) or more
Coolant Temp is 125°C (257°F) or more, or lower than ambient temperature*1 by 15°C (27°F) or more
-
-
Engine coolant temperature sensor
A
Other than above
-15% or less, or +15% or more
-
Fuel pump control system
Fuel injector assembly
B
-15 to +15%
Minimum speed is 300 rpm or more*2
Engine assembly
C
Minimum speed is below 300 rpm
Fuel system
Intake air system
D
Difference between Coolant Temp and Intake Air is less than 10°C (18°F)
-
-15% or less, or +15% or more
-
Fuel pump control system
Fuel injector assembly
B
-15% or less, or +15% or more
Minimum speed is 300 rpm or more*2
Engine assembly
C
Minimum speed is below 300 rpm
Fuel system
Intake air system
D
Tip:
*1: Use an actual ambient temperature estimated from the Initial Intake Air, Ambient Temp for A/C, and (if possible) the weather when the DTC was detected.
*2: Compression loss may have occurred in the engine assembly.
Check for foreign matter such as iron particles around the fuel pump (fuel pump, fuel pump filter, and inside the fuel tank), 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
Engine coolant temperature is 40°C (104°F) or less*1
Pressure regulator
A
Engine coolant temperature is 40 to 90°C (104 to 194°F)*2
Fuel injector assembly
B
Engine coolant temperature is 90°C (194°F) or more*3
Pressure regulator
A
Tip:
*1: If the engine coolant temperature is 40°C (104°F) or less (after stopping engine and vehicle not driven for a long period of time), the pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.
*2: If the engine coolant temperature is 40 to 90°C (104 to 194°F) (15 to 120 minutes have passed after stopping the engine), there may be fuel leaking from the fuel injector.
*3: If the engine coolant temperature is 90°C (194°F) or more (2 to 5 minutes have passed after stopping the engine), there may be a problem with the pressure regulator failing to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.
There is no initial combustion (combustion does not occur even once)*1
Fuel pressure of pressure regulator maintained
Fuel injector assembly leak
Fuel leak from fuel line
Fuel pump control system
Fuel pump
Spark plug
Crankshaft position sensor system
No. 1 ignition coil system
EGR valve assembly
C
The engine stalls after starter turnoff (engine stalls immediately after the first time the engine speed increases)*2
Intake system connections
Throttle body with motor assembly
Camshaft timing oil control valve assembly
Manifold absolute pressure sensor
EGR valve assembly
D
The initial combustion and starter turnoff occur late*3
Engine coolant temperature sensor
Manifold absolute pressure sensor
Heated oxygen sensor (sensor 1)
Heated oxygen sensor (sensor 2)
Fuel injector assembly
Spark plug
Pressure regulator
Fuel pump
Fuel pump control system
E
Tip:
If there is hesitation (cranking speed is slow and combustion occurs before passing TDC) during the initial cranking period, the battery charge may be insufficient or the starter may be malfunctioning.
*1: If there is no initial combustion, a wire harness may be malfunctioning, or the ignition or fuel system may be malfunctioning.
*2: If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the Camshaft timing oil control valve may have a problem returning.
*3: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or too high).
INSPECT ENGINE COOLANT TEMPERATURE SENSORClick here
A
PERFORM SIMULATION TEST
When cranking the engine, check for a noise indicating that the starter pinion gear is extending, and check that the starter pinion gear is not spinning freely.
Result
Problem Symptom
Suspected Area
Proceed to
A noise indicating that the starter pinion gear is extending is heard and the starter pinion gear is not spinning freely*1
Battery
Excess engine friction
Starter assembly
A
A noise indicating that the starter pinion gear is extending is heard and the starter pinion gear is spinning freely
Flywheel sub-assembly
Starter assembly
B
A noise indicating that the starter pinion gear is extending is not heard
Battery
Starter assembly
Starter system
Stop and start system*2
C
Tip:
*1: The battery may be fully depleted or there may be excess engine friction.
Check that the crankshaft rotates smoothly when rotating it by hand.
OK
Crankshaft rotates smoothly.
Result
Result
Proceed to
NG
A
OK
(w/ stop and start system)
B
OK
(w/o stop and start system)
C
Tip:
Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.
Check that the crankshaft rotates smoothly when rotating it by hand.
OK
Crankshaft rotates smoothly.
Result
Result
Proceed to
NG
A
OK
(w/ stop and start system)
B
OK
(w/o stop and start system)
C
Tip:
Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.
Confirm the conditions present when the malfunction occurred based on the customer problem analysis.
Result
Problem Symptom
Suspected Area
Proceed to
When the engine is stopped and a long time has passed, engine starting trouble occurs*1
Pressure regulator is stuck open
A
When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2
Fuel injector assembly leak
B
When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3
Failure to maintain fuel pressure by Pressure regulator
A
Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs
-
C
*4
Tip:
*1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.
*2: Fuel may be leaking from the fuel injector assembly.
*3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.
*4: From step 70, perform fuel system troubleshooting C (steps 71 to 74).
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.
If the wire harness is normal, after replacing the ignition coil, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 70 and perform troubleshooting for the ignition system (steps 76 to 81).
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
Powertrain > Engine and ECT > Active Test
Tester Display
Control the Fuel Pump / Speed
When performing the Active Test, check for fuel leakage from the fuel pipes.
Result
Result
Proceed to
Fuel leakage or signs of fuel leakage are present
A
No fuel leakage or signs of fuel leakage
B
Tip:
Jiggle the fuel hose and connector to increase the likelihood of detecting malfunctions that do not always occur.
Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
If there are no fuel leaks, after inspecting the fuel pump control system, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 70 and perform fuel system troubleshooting (steps 71 to 74).
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.
OK
There is no air suction.
Result
Proceed to
OK
NG
NG
REPAIR OR REPLACE INTAKE SYSTEM
OK
INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY
Disconnect the throttle body with motor assembly connector.
Tip:
When the connector is disconnected, the vehicle enters fail-safe mode and the throttle valve opening angle is 4 to 7°.
Crank the engine and check that it starts.
Result
Result
Proceed to
Engine starts
A
Engine does not start
B
Tip:
When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs.
PERFORM ACTIVE TEST USING GTS (CONTROL THE VVT SYSTEM)Click here
A
INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY
Check if carbon is in the air flow passage.
OK
No carbon present.
Result
Proceed to
OK
NG
NG
REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
OK
PERFORM ACTIVE TEST USING GTS (CONTROL THE VVT SYSTEM)
Connect the GTS to the DLC3.
Start the engine and warm it up.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT system (Bank 1).
Powertrain > Engine and ECT > Active Test
Tester Display
Control the VVT System (Bank1)
Tip:
When performing the Active Test, make sure the A/C is on and the shift lever is in neutral.
Check the engine speed while operating the camshaft timing oil control valve assembly using the GTS.
OK*
GTS Operation
Specified Condition
OFF
Normal engine speed
ON
Engine idles roughly or stalls
Result
Proceed to
OK
NG
Tip:
*: From step 70, perform intake system troubleshooting (steps 82 to 84). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 85 to 92).
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 is stuck ON, the valve overlap increases and combustion worsens due to the internal EGR which may cause the engine to stall.
NG
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
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.
If the wire harness is normal, after replacing the manifold absolute pressure sensor, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 70 and perform intake system troubleshooting (steps 82 to 84). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 85 to 92).
If the engine coolant temperature sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
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.
If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
Result
Proceed to
OK
NG
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
READ VALUE USING GTS (MAP)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAP.
Powertrain > Engine and ECT > Data List
Tester Display
MAP
Read the MAP value.
Standard
Same as actual atmospheric pressure.
Tip:
Reference MAP value:
Engine Condition
Specified Condition
Ignition switch ON, engine stopped
80 to 110 kPa*
*: varies with weather condition.
Tip:
If the manifold absolute pressure sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
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.
If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
Result
Proceed to
OK
NG
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
READ VALUE USING GTS (LONG FT #1)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Long FT #1.
PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Start the engine, turn off all accessory switches and warm up the engine until the engine coolant temperature stabilizes.
Idle the engine.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / All Data / O2S B1S1.
Powertrain > Engine and ECT > Active Test
Active Test Display
Control the Injection Volume for A/F Sensor
Data List Display
O2S B1S1
Read the output voltage from the heated oxygen sensor (sensor 1) when increasing and decreasing the fuel injection volume.
Standard
GTS Display
Specified Condition
Control the Injection Volume for A/F Sensor (12.5%)
Heated oxygen sensor (sensor 1) output voltage is higher than 0.55 V
Control the Injection Volume for A/F Sensor (-12.5%)
Heated oxygen sensor (sensor 1) output voltage is below 0.4 V
Tip:
The heated oxygen sensor (sensor 1) has an output delay of a few seconds and the heated oxygen sensor (sensor 2) has a maximum output delay of approximately 20 seconds.
If the heated oxygen sensor (sensor 1) is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
Check if the idling speed is stable after starting the engine.
OK
Speed is stable.
Tip:
After replacing the fuel injector or manifold absolute pressure sensor, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
*1: If one cylinder is abnormal, replace the spark plug of that cylinder and inspect the ignition and fuel system for that cylinder. After performing repairs, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
*2: If all cylinders are abnormal, replace the spark plugs of all cylinders and check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
*3: Engine starting trouble may occur if the vehicle is driven extremely short distances repeatedly.
Confirm the conditions present when the malfunction occurred based on the customer problem analysis.
Result
Problem Symptom
Suspected Area
Proceed to
When the engine is stopped and a long time has passed, engine starting trouble occurs*1
Pressure regulator is stuck open
A
When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2
Fuel injector assembly leak
B
When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3
Failure to maintain fuel pressure by pressure regulator
A
Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs
-
C
*4
Tip:
*1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.
*2: Fuel may be leaking from the fuel injector.
*3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.
*4: From step 70, perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
Result
Result
Proceed to
Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)
A
147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)
B
*
Tip:
If the engine cannot be started, check the fuel pressure after cranking the engine.
*: From step 70, perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
Clean the inside of the surge tank with compressed air.
After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.
Result
Result
Proceed to
4000 ppm or higher
A
Less than 4000 ppm
B
*
Tip:
If the concentration is 4000 ppm or higher, the fuel injector may have a sealing problem.
*: From step 70, perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
If the malfunction could not be identified during the inspection in steps 38, 39, 40 and 46, perform fuel system troubleshooting C (steps 71 to 74).
Result
Performed Step
Troubleshooting by System
Procedure
Proceed to
Steps 38, 39, 40 and 46
Fuel system troubleshooting C
71 to 74
A
If the malfunction could not be identified during the inspection in step 44, perform ignition system troubleshooting (steps 76 to 81).
Result
Performed Step
Troubleshooting by System
Procedure
Proceed to
Step 44
Ignition system troubleshooting
76 to 81
B
If the malfunction could not be identified during the inspection in steps 53 and 56, perform intake air system troubleshooting (steps 82 to 84). If engine starting trouble still occurs, perform fuel intake system troubleshooting A (steps 85 to 92).
Result
Performed Step
Troubleshooting by System
Procedure
Proceed to
Step 53 and 56
Intake air system troubleshooting
82 to 84
C
Fuel system troubleshooting A
85 to 92
If the malfunction could not be identified during the inspection in steps 57, 58, 59, 60, 63, 64, 66, 67, 68, 69 and 70, perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake air system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
Powertrain > Engine and ECT > Active Test
Tester Display
Control the Fuel Pump / Speed
When performing the Active Test, check for fuel leakage from the fuel pipes.
Result
Result
Proceed to
Fuel leakage or signs of fuel leakage are present
A
No fuel leakage or signs of fuel leakage
B
Tip:
Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
If there are no fuel leaks, after inspecting the fuel pump control system. check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 70 and perform fuel system troubleshooting A (steps 93 to 100), fuel system troubleshooting B (steps 101 to 103), intake system troubleshooting (steps 104 to 106), and ignition system troubleshooting (steps 107 to 112), in that order.
Check if the idling speed after starting the engine is currently stable and has always been stable in the past.
Result
Problem Symptom
Suspected Area
Proceed to
Current unstable idling speed or history of unstable idling speed
Crankshaft position sensor system
A
All current and past idling speeds are stable
Fuel
B
Tip:
Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle.
B
REPLACE FUEL
A
CHECK CRANKSHAFT POSITION SENSOR (SENSOR INSTALLATION)
Check the tightening and installation condition of the crankshaft position sensor bolt.
Check the connection of the crankshaft position sensor connector.
Check if the idling speed after starting the engine is currently stable and has always been stable in the past.
Result
Problem Symptom
Suspected Area
Proceed to
Current unstable idling speed or history of unstable idling speed
Crankshaft position sensor system
A
All current and past idling speeds are stable
Fuel
B
Tip:
Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle.
B
REPLACE FUEL
A
CHECK CRANKSHAFT POSITION SENSOR (SENSOR INSTALLATION)
Check the tightening and installation condition of the crankshaft position sensor bolt.
Check the connection of the crankshaft position sensor connector.
