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 P0116, P0125 and P0128?	Go to applicable DTC (s).	Go to Step 3.
3	ECT sensor signal circuit and ground circuit check Confirm that ignition mode of keyless push start system is "OFF". Disconnect "C01", "E01" and ECT sensor connectors. Check for proper terminal connection to "C01", "E01" and ECT sensor connectors. If connections are OK, check the following points. Resistance of each "A1" and "A2" circuits: less than 1 Ω Resistance of "A1" circuit between ECT sensor connector and ground: infinity Resistance between "A1" circuit terminal and each terminal at ECT sensor connector: infinity Voltage of "A1" and "A2" circuits: (0 - 1 V with ignition mode of keyless push start system in "ON") Are they in good condition?	Go to Step 4.	Repair or replace defective wire harness.
4	ECT sensor check Check ECT sensor, see ECT SENSOR INSPECTION . Is it in good condition?	Go to Step 5.	Replace ECT sensor, see ECT SENSOR REMOVAL AND INSTALLATION .
5	Thermostat check Check thermostat, see THERMOSTAT INSPECTION . Is it in good condition?	Replace ECM and recheck DTC, see ECM REMOVAL AND INSTALLATION .	Replace thermostat, see THERMOSTAT REMOVAL AND INSTALLATION .