Diagnostic procedure
STEP
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INSPECTION
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ACTION
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to available repair information.
• If vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTC
• Turn the ignition switch off, then to the ON position (Engine off).
• Verify related pending code or stored DTCs.
• Is other DTCs present?
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Yes
|
Go to the appropriate DTC troubleshooting.
(See DTC TABLE [LF, L3].)
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No
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Go to the next step.
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4
|
VERIFY CURRENT INPUT SIGNAL STATUS (KEY TO ON /IDLE)
• Access BOO, ECT, IAT, MAF, RPM, TP and VSS PIDs using WDS or equivalent.
(See PCM INSPECTION [LF, L3].)
• Is there any signal that is far out of specification when ignition switch is turned to the ON position and engine idles?
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Yes
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Inspect suspected circuit and/or part according to inspection results. Then go to Step 13.
(See PCM INSPECTION [LF, L3].)
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No
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Go to the next step.
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5
|
VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
• Inspect same PIDs as in Step 4 while simulating FREEZE FRAME DATA condition.
• Is there any signal which causes drastic changes?
|
Yes
|
Inspect suspected circuit and/or part according to inspection results. Then go to Step 13.
(See PCM INSPECTION [LF, L3].)
|
No
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Go to the next step.
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6
|
INSPECT SPARK PLUG CONDITION
• Turn the ignition switch off.
• Remove spark plug from suspected cylinder.
• Inspect spark plug condition:
• Is any problem found on spark plug?
|
Yes
|
• If spark plug is wet, fuel flooding is suspected. Go to step 13.
• If spark plug has a cracks, excessive wear or improper gap, replace the malfunctioning spark plug. Then go to Step 13.
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No
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Go to the next step.
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7
|
INSPECT IGNITION COIL WIRING HARNESSES
• Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders.
• Are wiring harness conditions normal?
|
Yes
|
Go to the next step.
|
No
|
Repair the wiring harnesses, then go to Step 13.
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8
|
INSPECT FOR AIR SUCTION AT INTAKE-AIR SYSTEM
• Inspect for air leakage at following:
• Is air leakage found?
|
Yes
|
Repair or replace suspected part, then go to Step 13.
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No
|
Go to the next step.
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9
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INSPECT FUEL INJECTOR WIRING HARNESS
• Remove intake air system parts.
• Disconnect the fuel injector connector on suspected cylinder.
• Connect NOID LIGHT to fuel injector terminals.
• Inspect dim of light during cranking.
• Does noid light illuminate?
|
Yes
|
Go to the next step.
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No
|
Inspect for fuel injector wiring harnesses.
Repair or replace it if necessary, then go to Step 13.
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10
|
INSPECT SEALING OF ENGINE COOLANT PASSAGE
• Perform ENGINE COOLANT LEAKAGE INSPECTION.
• Is there any malfunction?
|
Yes
|
Repair or replace the malfunctioning part according to inspection result.
Then go to Step 13.
|
No
|
Go to the next step.
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11
|
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
• Is engine compression normal?
|
Yes
|
Go to the next step.
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No
|
Overhaul the engine, then go to Step 13.
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12
|
INSPECT FUEL INJECTOR OPERATION
• Remove the fuel injector from suspected cylinder.
• Switch the injector with the injector on other cylinder.
• Start the engine and idle it.
• Is misfire DTC for cylinder which has a suspected fuel injector?
|
Yes
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Replace the injector, then go to the next step.
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No
|
Go to the next step.
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13
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VERIFY TROUBLESHOOTING OF MISFIRE DTC COMPLETED
• Make sure to reconnect all disconnected connectors.
• Start the engine.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the PCM Adaptive Memory Produce Drive Mode. (See OBD DRIVE MODE [LF, L3].)
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
|
Go to the next step.
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14
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VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTC present?
|
Yes
|
Go to the applicable DTC troubleshooting.
(See DTC TABLE [LF, L3].)
|
No
|
Troubleshooting completed.
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