Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Start the engine, and let it idle for 5 minutes or more.
- Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 0°F(-18°C) or less indicated? YES -Check for poor connections or loose terminals at ECT SENSOR 1, ECT SENSOR 2, and the PCM. If they are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(ref-513833-S15821966552012111600000) ), then go to step 10 . NO -Go to step 3.
- Turn the ignition switch to LOCK (0).
- Allow the engine to cool to 104°F (40°C) or less.
- Make sure the temperature difference of ECT SENSOR 1 and ECT SENSOR 2 is between about 50°F (10°C) in the DATA LIST with the HDS.
- Start the engine, and let it idle until ECT sensor 1 goes up about 158°F (70°C). Does ECT SENSOR 2 also show about 158°F (70°C)? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
- Check the thermostat (see «FAN MOTOR TEST»(ref-513839-S32671492482012111600000) ). Is the thermostat OK? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If they are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(ref-513833-S15821966552012111600000) ), then go to step 8. NO -Replace the thermostat (see «THERMOSTAT REPLACEMENT»(ref-513839-S22941550142012111600000) ), then go to step 8.
- Turn the ignition switch to ON (II).
- Reset the PCM with the HDS.
- Turn the ignition switch to LOCK (0).
- Allow the engine to cool 104°F (40°C) or less.
- Check the temperature difference of ECT SENSOR 1 and ECT SENSOR 2 is between about 50°F (10°C) in the DATA LIST with the HDS.
- Start the engine, and let it idle until ECT sensor 1 goes up about 158°F (70°C). Does ECT SENSOR 2 also show about 158°F (70°C)? YES -Go to step 1 and recheck. NO -Troubleshooting is complete.