DTC Troubleshooting

NOTE: When DTC P0118 and P0113 are indicated together, it is possible that ECT sensor ground circuit is open.

DTC TROUBLESHOOTING PROCEDURES

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	Wire harness check Turn ignition switch OFF position. Disconnect connectors from ECT sensor and ECM. Check for proper terminal connection to ECT sensor and ECM connectors. If connections are OK, check that ECT sensor circuit is as follows. Wiring harness resistance of each ECT sensor signal and ground circuit is less than 3 Ω. Insulation resistance of ECT sensor signal circuit is infinity between ECT sensor connector and vehicle body ground. Insulation resistance of wire harness is infinity between ECT sensor signal terminal and each other terminal at ECT sensor connector. Circuit voltage of each ECT sensor signal and ground circuit is 0 - 1 V with ignition switch turned ON. Are they in good condition?	Go to Step 3.	Repair or replace defective wire harness.
3	ECT sensor reference voltage check Connect connectors to ECM. Turn ignition switch to ON position. Check that ECT sensor signal voltage is 5 V between ECT sensor connector and vehicle body ground. Is it in good condition?	Go to Step 4.	Substitute a known-good ECM and recheck.
4	ECT sensor check Check ECT sensor for performance referring to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION . Is it in good condition?	Substitute a known-good ECM and recheck.	Replace ECT sensor.