Diagnostic procedure
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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 next step.
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No
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Record FREEZE FRAME DATA on repair order, then go to next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
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No
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Go to next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTCS
• Turn ignition key to OFF, then ON (Engine OFF).
• Verify related pending code or stored DTCs.
• Is other DTCs present?
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Yes
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Go to appropriate DTC troubleshooting procedures.
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No
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If driveability concern or rough idle is present, go to Step 9.
If not, go to next step.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P0172 on FREEZE FRAME DATA?
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Yes
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Go to next step.
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No
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Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
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5
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VERIFY CURRENT INPUT SIGNAL STATUS (IGNITION KEY TO ON/IDLE)
• Access ECT, MAF, TP and VSS PIDs using WDS or equivalent.
• Is there any signal that is far out of specification when ignition key is at ON and engine is running?
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Yes
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Inspect suspected sensor and excessive resistance in related wiring harnesses. Repair or replace if necessary. Then go to Step 11.
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No
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Go to next step.
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6
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VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
• Inspect same PIDs as is Step 4 while simulating FREEZE FRAME DATA condition.
• Is there any input signal which causes drastic changes?
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Yes
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Inspect suspected sensor and related wiring harnesses, and repair or replace it. Then go to Step 11.
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No
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Go to next step.
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7
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VERIFY CURRENT INPUT SIGNAL STATUS OF FRONT HO2S
• Access O2S11 PID using WDS or equivalent.
• Verify PID while racing engine (in NEUTRAL).
• Is PID reading okay?
- Above 0.55 V when accelerator pedal is suddenly depressed (rich condition). - Below 0.55 V just after release of accelerator pedal (lean condition) |
Yes
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Go to next step.
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No
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Replace suspected front HO2S.
Then go to Step 11.
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8
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INSPECT FUEL LINE PRESSURE
• Turn ignition key to OFF.
• Connect fuel gauge to fuel pipe.
• Start engine and run it at idle.
• Inspect fuel line pressure while engine running.
• Is fuel line pressure okay?
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Yes
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Go to next step.
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No
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Replace fuel pump unit, then go to Step 11
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9
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INSPECT PURGE SOLENOID VALVE FOR STUCK OPEN
• Turn ignition key to OFF.
• Disconnect both hoses from purge solenoid valve.
• Blow air through purge solenoid valve.
• Does air blow through?
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Yes
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Replace purge solenoid valve.
Then go to Step 11.
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No
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Go to next step.
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10
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INSPECT PCV VALVE OPERATION
• Inspect PCV valve operation.
(See PCV VALVE INSPECTION [L3].)
• Is PCV valve okay?
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Yes
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Go to next step.
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No
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Replace PCV valve, then go to next step.
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11
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VERIFY TROUBLESHOOTING OF DTC P0172 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from memory using WDS or equivalent.
• Run OBD DRIVE MODE.
(See OBD DRIVE MODE [L3].)
• Is PENDING CODE of same DTC present?
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Yes
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Replace PCM, then go to next step.
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No
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Go to next step.
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12
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VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
(See AFTER REPAIR PROCEDURE [L3].)
• Is there any DTC present?
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Yes
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Go to applicable DTC troubleshooting.
(See DTC TABLE [L3].)
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No
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Troubleshooting completed.
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