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DTC Troubleshooting

DIAGNOSTIC INFORMATION AND PROCEDURES REFERENCE CHART

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2  IMT valve actuator drive circuit check 
  1. Disconnect connectors from IMT valve actuator and ECM with ignition switch turned OFF.
  2. Check for proper terminal connection to IMT valve actuator and ECM connectors.
  3. If connection are OK, check that IMT valve circuit is as follows.
    • Wiring harness resistance of IMT valve actuator drive circuit is less than 3 Ω.
    • Insulation resistance of IMT valve actuator drive circuit is infinity between IMT valve actuator connector and vehicle body ground.
    • Insulation resistance of wire harness is infinity between IMT valve actuator drive terminal and each other terminal at IMT valve connector.

Are they in good condition? 		 Go to Step 3. Repair or replace IMT valve actuator drive circuit.
3  IMT valve actuator check 
  1. Check IMT valve actuator. Refer to IMT VALVE ACTUATOR INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck DTC Replace IMT valve actuator.
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