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STEP
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INSPECTION
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ACTION
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1
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• Does engine idle rough?
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Yes
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Go to symptom troubleshooting "No.8 Engine runs rough/rolling idle".
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No
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Go to next step.
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2
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• Verify following:
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- Proper routing and no damage of vacuum lines
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- IAC valve properly connected
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- No air leakage from intake-air system
• Are all items normal?
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Yes
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Go to next step.
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No
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Service as necessary.
Repeat Step 2.
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3
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• Connect WDS or equivalent to DLC-2.
• Turn ignition switch to ON (Engine OFF).
• Retrieve any DTC.
• Is "PASSED" displayed?
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Yes
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No DTC is displayed:
• Go to next step.
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No
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DTC is displayed:
• Go to appropriate DTC test.
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4
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• Does idle speed drop or stall when disconnecting IAC valve?
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Yes
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Go to next step.
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No
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Inspect following:
• Circuit from IAC valve to PCM connector terminal 87 or 88 for open and short
• IAC valve for sticking
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- If normal, go to next step.
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5
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• Disconnect vacuum hose between purge solenoid valve and intake manifold from purge solenoid valve side.
• Plug opening end of vacuum hose.
• Drive vehicle.
• Does engine condition improve?
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Yes
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Inspect EVAP control system.
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No
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Go to next step.
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6
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• Connect WDS or equivalent to DLC-2.
• Access TP, MAF and VSS PIDs.
• Monitor each PID while driving vehicle.
• Are PIDs normal?
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Yes
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Intermittent concern exists.
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No
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TP PID:
• Inspect TP sensor.
MAF PID:
• Inspect MAF sensor.
VSS PID:
• Inspect VSS.
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7
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• Verify test results.
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- If normal, return to diagnostic index to service any additional symptoms.
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- If malfunction remains, inspect related Service Information and perform repair or diagnosis.
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• If vehicle is repaired, troubleshooting completed.
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• If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.
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