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DTC Troubleshooting

DIAGNOSTIC PROCEDURES 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  IAT sensor circuit check 
  1. Check "B1" and "B2" circuits according to Step 3 of DTC P0111  .

Are they in good condition? 		 Go to Step 3. Repair or replace defective wire harness.
3  IAT sensor check 
  1. Check IAT sensor, see MAF AND IAT SENSOR INSPECTION .

Is it in good condition? 		 Replace ECM and recheck DTC, see ECM REMOVAL AND INSTALLATION . Replace MAF & IAT sensor, see MAF AND IAT SENSOR REMOVAL AND INSTALLATION .
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