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DTC Troubleshooting

P0111 DIAGNOSIS PROCEDURE

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:J24B .
2  DTC check 
  1. Check DTC.

Is there DTC(s) other than P0111? 		 Go to applicable DTC (s). Go to Step 3.
3  IAT sensor signal circuit and ground circuit check 
  1. Turn OFF ignition switch and disconnect connectors from MAF and IAT sensor and ECM.
  2. Check for proper terminal connection to MAF and IAT sensor and ECM connectors.
  3. If connections are OK, check that IAT sensor signal circuit (B1) and IAT sensor ground circuit (B2) are as follows.
    • Wiring harness resistance of each IAT sensor signal circuit and ground circuit is less than 3 Ω.
    • Insulation resistance of IAT sensor signal circuit is infinity between MAF and IAT sensor connector and vehicle body ground.
    • Insulation resistance of wire harness is infinity between IAT sensor signal circuit terminal and each terminal at MAF and IAT sensor connector.
    • Insulation resistance of wire harness is infinity between IAT sensor ground circuit terminal and each terminal at MAF and IAT sensor connector.
    • Circuit voltage of each IAT sensor signal circuit and ground circuit is 0 - 1 V with ignition switch in ON position.

Are they in good condition? 		 Go to Step 4. Repair or replace defective wire harness.
4  IAT sensor check 
  1. Check IAT sensor, see MAF (MASS AIR FLOW) AND IAT (INTAKE AIR TEMPERATURE) SENSOR INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace MAF and IAT sensor.
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