SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500, P030600

DTC Code	DTC Name
P030000	Random/Multiple Cylinder Misfire Detected
P030027	Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold
P030085	Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range
P030100	Cylinder 1 Misfire Detected
P030200	Cylinder 2 Misfire Detected
P030300	Cylinder 3 Misfire Detected
P030400	Cylinder 4 Misfire Detected
P030500	Cylinder 5 Misfire Detected
P030600	Cylinder 6 Misfire Detected

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the VVT sensor and the crankshaft position sensor. The VVT sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P030000	Random/Multiple Cylinder Misfire Detected	Simultaneous misfiring of several cylinders occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: P0300
P030027	Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold	An emission deterioration misfire occurs (2 trip detection logic).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on	DTC stored	SAE Code: -
P030085	Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range	A misfire occurs that may damage the three-way catalytic converter (2 trip detection logic).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: -
P030100	Cylinder 1 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: P0301
P030200	Cylinder 2 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: P0302
P030300	Cylinder 3 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: P0303
P030400	Cylinder 4 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: P0304
P030500	Cylinder 5 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: P0305
P030600	Cylinder 6 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	DTC stored	SAE Code: P0306

When DTCs for misfiring cylinders are randomly stored, but DTC P030000 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P030000 is only stored when several misfiring cylinders are detected at the same time.

MONITOR DESCRIPTION

The ECM illuminates the MIL and stores a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).

Within the first 1000 crankshaft revolutions after the engine starts, an excessive number of misfires (approximately 50 to 100 misfires per 1000 crankshaft revolutions) occurs once.
An excessive number of misfires (approximately 50 to 100 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

The ECM flashes the MIL (immediate detection logic) and stores a DTC (2 trip detection logic) when either one of the following conditions, which could cause damage to the three-way catalytic converter, is detected.

At a high engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected once.
At a normal engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected 3 times.

MONITOR STRATEGY

Required Sensors/Components (Main)

Crankshaft position sensor

VVT sensor

Required Sensors/Components (Related)

Engine coolant temperature

Intake air temperature sensor (mass air flow meter sub-assembly)

Mass air flow meter sub-assembly

Frequency of Operation

Continuous

TYPICAL ENABLING CONDITIONS

Misfire
Either of the following conditions is met	(a) or (b)
(a) Engine coolant temperature at engine start	Higher than -7°C (19°F)
(b) Engine coolant temperature	Higher than 20°C (68°F)

Monitor Period of Emission-related Misfire
Monitor period	Crankshaft 1000 revolutions x 4

Monitor Period of Catalyst-damaging Misfire (MIL Blinks)
Monitor period	Crankshaft 200 revolutions x 3

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Record the DTC(s) and Freeze Frame Data.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Using the GTS, switch the ECM from normal mode to check mode.

Click here
Start the engine.
Read the misfire counts of each cylinder, Misfire Count Cylinder #1 to Misfire Count Cylinder #6, with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.

Drive the vehicle so that the vehicle conditions displayed in Misfire RPM and Misfire Load of the Data List are the same as the freeze frame data. Perform this step several times.

Tech Tips

In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, confirm the Misfire RPM and Misfire Load in the Data List.

Engine speed	Duration
Idling	8.0 minutes or more
1000	4.5 minutes or more
2000	2.5 minutes or more
3000	1.5 minutes or more

Check whether misfires have occurred by checking DTCs and Freeze Frame Data.

Tech Tips

Do not turn the engine switch off until the output DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data are cleared.
Record the DTC(s), freeze frame data and misfire counts.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.

WIRING DIAGRAM

Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
Check the "Fuel Cut Elapsed Time" in the Data List or the Freeze Frame Data.

If the elapsed time is over 0 seconds, then the engine speed is high (engine speed at which fuel cut occurs + 500 rpm).

When this has happened, there is the possibility that the No. 1 valve rocker arm sub-assembly will become loose and a fire could start, so check that the No. 1 valve rocker arm sub-assembly is properly attached.
By clearing the DTCs, "Fuel Cut Elapsed Time" will be cleared.
If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem:

There was insufficient fuel in the tank.
Improper fuel was used.
The spark plugs have been contaminated.
The problem requires further diagnosis.

After finishing repairs, check the misfire counts of the cylinders (Misfire Count Cylinder #1 to Misfire Count Cylinder #6).
Be sure to confirm that no misfiring cylinder DTCs are stored again by performing the confirmation driving pattern after finishing repairs.
For 6 cylinder engine, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed. If misfires occur only in high engine speed areas, only DTC P030000 is set.

In the event of DTC P030000 being present, perform the following operations:

Clear the DTCs.

Click here
Start the engine and conduct the confirmation driving pattern.
Read the misfire count of each cylinder or DTC(s) using the GTS.
Repair the cylinder(s) that has a high misfiring count or is indicated by the DTC.
After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P030000 is not set.

When one of Short FT B1S1, Long FT B1S1, Short FT B2S1 or Long FT B2S1 in the freeze frame data is outside the range of +/-15%, the air fuel ratio may be rich (-15% or less) or lean (15% or higher).
When Coolant Temperature in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while warming up the engine.
Vehicle body vibration caused by an extremely imbalanced drive wheel may cause misfire DTCs to be stored.
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 and/or P030600 are output	A
DTC P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 and/or P030600 and other DTCs are output	B

Tech Tips

If any DTCs other than P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 and/or P030600 are output, troubleshoot those DTCs first.

GO TO DTC CHART Click here

CHECK PCV HOSE CONNECTIONS

Check the PCV hose connections.

Click here

OK
PCV valve and hose are correctly connected and are not damaged.

Result

Proceed to
OK
NG

REPAIR OR REPLACE PCV HOSE

READ VALUE USING GTS (MISFIRE RPM AND MISFIRE LOAD)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Misfire RPM and Misfire Load.

Powertrain > Engine > Data List

Tester Display
Misfire RPM
Misfire Load

Read and note the Misfire RPM and Misfire Load values.

Tech Tips

The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.

Result

Proceed to
NEXT

READ VALUE USING GTS (CATALYST OT MISFIRE FUEL CUT)

Enter the following menus: Powertrain / Engine / Data List / Catalyst OT Misfire Fuel Cut.

Powertrain > Engine > Data List

Tester Display

Catalyst OT Misfire Fuel Cut

Tester Display
Catalyst OT Misfire Fuel Cut

Read the value displayed on the GTS.

Result

Data List	Result	Proceed to
Catalyst OT Misfire Fuel Cut	Avail	A
Catalyst OT Misfire Fuel Cut	Not Avl	B

CHECK MISFIRE COUNT OF PORT INJECTION Click here

READ FREEZE FRAME DATA (CATALYST OT MISFIRE FUEL CUT HISTORY)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.

Using the GTS, confirm the vehicle conditions recorded in the Freeze Frame Data which were present when the DTC was stored.

Powertrain > Engine > DTC(P030000) > Freeze Frame Data

Tester Display
Catalyst OT Misfire Fuel Cut History

Result

Freeze Frame Data Item	Result	Proceed to
Catalyst OT Misfire Fuel Cut History	ON	A
Catalyst OT Misfire Fuel Cut History	OFF	B

GO TO STEP 7 Click here

CHECK MISFIRE COUNT OF PORT INJECTION

Connect the GTS to the DLC3.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Active Test / Prohibit the Catalyst OT Misfire Prevent Fuel Cut / Data List / Coolant Temperature, Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6.

Powertrain > Engine > Active Test

Active Test Display
Prohibit the Catalyst OT Misfire Prevent Fuel Cut

Data List Display
Coolant Temperature
Injection Mode
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4
Misfire Count Cylinder #5
Misfire Count Cylinder #6

Read each value for Misfire Count Cylinder #1 to Misfire Count Cylinder #6 and Injection Mode displayed on the GTS while performing the Active Test.

Result

Injection Mode	Misfire Count	Proceed to
Port	1 or 2 cylinders have misfire counts	A
	3 cylinders or more have misfire counts	A
	There are no misfire counts	B

GO TO STEP 8 Click here

GO TO STEP 11 Click here

CHECK MISFIRE COUNT OF PORT INJECTION

Connect the GTS to the DLC3.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Data List / Coolant Temperature, Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Mode

Data List Display
Coolant Temperature
Injection Mode
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4
Misfire Count Cylinder #5
Misfire Count Cylinder #6

According to the display on the GTS, read the Data List with the Active Test "Control the Injection Mode" set to Port. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.

Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using GTS (Misfire RPM and Misfire Load)" procedures above [A].
Read the Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6 or DTCs displayed on the GTS [B].

Result

Injection Mode	Misfire Count	Proceed to
Port	1 or 2 cylinders have misfire counts	A
	3 cylinders or more have misfire counts	A
	There are no misfire counts	B

CHECK MISFIRE COUNT OF DIRECT INJECTION Click here

CHECK MISFIRE COUNT OF DIRECT INJECTION

Connect the GTS to the DLC3.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Data List / Coolant Temperature, Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Mode

Data List Display
Coolant Temperature
Injection Mode
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4
Misfire Count Cylinder #5
Misfire Count Cylinder #6

According to the display on the GTS, read the Data List with the Active Test "Control the Injection Mode" set to Direct. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.

Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using GTS (Misfire RPM and Misfire Load)" procedures above [A].
Read the Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6 or DTCs displayed on the GTS [B].

Result

Misfire Count		Proceed to
Port (Result of step 6 or 7)	Direct	Proceed to
1 or 2 cylinders have misfire counts	1 or 2 cylinders have misfire counts	A
3 cylinders or more have misfire counts	3 cylinders or more have misfire counts	B
1 or 2 cylinders have misfire counts	There are no misfire counts	C
3 cylinders or more have misfire counts	There are no misfire counts	D

Tech Tips

Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

Click here

GO TO STEP 14 Click here

GO TO STEP 17 Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION (MISFIRING CYLINDER)) Click here

CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

Check the fuel pressure (for low pressure side).

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

Click here

Result

Proceed to
OK
NG

REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION (MISFIRING CYLINDER)) Click here

CHECK FURL PUMP OPERATION (FOR LOW PRESSURE SIDE)

Check the fuel pump operation (for low pressure side).

Click here

Result

Proceed to
OK
NG

CHECK AND REPLACE FUEL SYSTEM

GO TO FUEL PUMP CONTROL CIRCUIT Click here

CHECK MISFIRE COUNT OF DIRECT INJECTION

Connect the GTS to the DLC3.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Data List / Coolant Temperature, Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Mode

Data List Display
Coolant Temperature
Injection Mode
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4
Misfire Count Cylinder #5
Misfire Count Cylinder #6

Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using GTS (Misfire RPM and Misfire Load)" procedures above [A].
Read the Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6 or DTCs displayed on the GTS [B].

Result

Misfire Count		Proceed to
Port (Result of step 6 or 7)	Direct	Proceed to
There are no misfire counts	There are misfire counts	A
There are no misfire counts	There are no misfire counts	B

Tech Tips

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Click here

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK MISFIRE COUNT

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature, Injection Mode, Misfire Count Cylinder #1 to Misfire Count Cylinder #6, Misfire RPM and Misfire Load.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature
Injection Mode
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4
Misfire Count Cylinder #5
Misfire Count Cylinder #6
Misfire RPM
Misfire Load

Drive the vehicle with Misfire RPM and Misfire Load.

Monitor all of the misfire count values or DTCs and Injection Mode displayed on the GTS.

Result

Misfire Count	Injection Mode	Proceed to
There are no misfire counts	-	A
1 or 2 cylinders have misfire counts	Port or Either	B
3 cylinders or more have misfire counts	Port or Either	C
There are misfire counts	Direct	D

Tech Tips

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click here

CHECK FOR INTERMITTENT PROBLEMS Click here

CHECK INTAKE SYSTEM Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Click here

INSPECT SPARK PLUG

Inspect the spark plug of the misfiring cylinder.

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the spark plug.

Click here

Result

Proceed to
OK
NG

REPLACE SPARK PLUG Click here

CHECK FOR SPARK (SPARK TEST)

Perform a spark test.

Click here

Tech Tips

If the result of the spark test is normal, proceed to the next step.
Perform "Inspection After Repair" after replacing the spark plug or ignition coil assembly.

Click here

Result

Proceed to
NEXT

CHECK CYLINDER COMPRESSION PRESSURE

Measure the cylinder compression pressure of the misfiring cylinder.

Click here

Tech Tips

Perform "Inspection After Repair" after repairing or replacing the engine assembly.

Click here

Result

Proceed to
OK
NG

REPLACE ECM Click here

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Click here

OK
No leaks in intake system.

Tech Tips

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE INTAKE SYSTEM

READ VALUE USING GTS (COOLANT TEMPERATURE)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display

Coolant Temperature

Read the Data List twice, when the engine is both cold and warmed up.

Standard

GTS Display	Condition	Specified Condition
Coolant Temperature	Cold engine	Same as ambient air temperature
Coolant Temperature	Warm engine	Between 75 and 100°C (167 and 212°F)

Tech Tips

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

Click here

Result

Proceed to
OK
NG

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor
Coolant Temperature

Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.

Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

Standard

GTS Display

Condition

Specified Condition

Mass Air Flow Sensor

Engine warmed up

Shift position: P

A/C: Off

Engine Speed: 3000 rpm

Between 10.6 and 15.8 gm/sec

Result

Proceed to
OK
NG

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) Click here

CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

Remove the cylinder head cover sub-assembly and cylinder head cover sub-assembly LH.

*a	Timing Mark	*b	TDC Timing Mark
*c	Groove	-	-

Turn the crankshaft pulley and align its groove with the TDC timing mark of the timing chain cover.

Check that the timing marks of the camshaft timing gear assemblies and camshaft timing exhaust gear assemblies are aligned with the timing marks of the bearing cap as shown in the illustration.

Tech Tips

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

OK
Timing marks on camshaft timing gear assemblies and camshaft timing exhaust gear assemblies are aligned as shown in the illustration.

Tech Tips

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

Result

Proceed to
OK
NG

GO TO STEP 24 Click here

CHECK ENGINE MECHANICAL SYSTEM

Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

Tech Tips

Perform "Inspection After Repair" after repairing or replacing the engine mechanical system.

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CONFIRM WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 or P030600.

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 and/or P030600 are output)

CHECK FOR INTERMITTENT PROBLEMS Click here

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

Click here

Tech Tips

Repair any problems.

Result

Proceed to
NEXT

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 or P030600.

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 and/or P030600 are output)

END

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

Disconnect the mass air flow meter sub-assembly connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
F38-5 (VG) - F87-116 (VG)	Always	Below 1 Ω
F38-4 (E2G) - F87-115 (E2G)	Always	Below 1 Ω
F38-5 (VG) or F87-116 (VG) - Body ground and other terminals	Always	10 kΩ or higher
F38-4 (E2G) or F87-115 (E2G) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Replace the mass air flow meter sub-assembly.

Click here

Tech Tips

If the results of the inspections performed in step 19 (READ VALUE USING GTS (MASS AIR FLOW SENSOR)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

Click here

Result

Proceed to
NEXT

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 or P030600.

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P030000, P030027, P030085, P030100, P030200, P030300, P030400, P030500 and/or P030600 are output)

END

REPLACE ECM Click here