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	DTC check 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 Confirm that ignition mode of keyless push start system is "OFF". Disconnect "C01", "E01" and MAF & IAT sensor connectors. Check for proper terminal connection to "C01", "E01" and MAF & IAT sensor connectors. If connections are OK, check the following points. Resistance of each "B1" and "B2" circuits: less than 1 Ω Resistance of "B1" circuit between MAF & IAT sensor connector and ground: infinity Resistance between "B1" circuit terminal and each terminal at MAF & IAT sensor connector: infinity Resistance between "B2" circuit terminal and each terminal at MAF & IAT sensor connector: infinity Are they in good condition?	Go to Step 4.	Repair or replace defective wire harness.
4	IAT sensor check 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 .