P1792

DTC P1792: Problem in Engine Coolant Temperature Sensor Circuit
ULEV Model

NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.

1. Check whether the scan tool or the HDS indicates a code for the engine coolant temperature (ECT) sensor in the fuel and emissions system.
Does the scan tool or the HDS indicate a code for ECT sensor?
YES- Do the DTC Troubleshooting for the ECT sensor circuit. Recheck for DTC P1792 after troubleshooting.
NO- Go to step 2.
2. Turn the ignition switch OFF.
3. Disconnect TCM connectors A (31P) and C (17P).
4. Turn the ignition switch ON (II).





5. Measure the voltage between TCM connector terminals C14 and A23 or A24.
Is there about 5 V?
YES- Go to step 6.
NO- Repair open or short in VREF wire between TCM connector terminal C14 and the ECM.





6. Measure the voltage between TCM connector terminals C11 and A23 or A24.
Is there 0.1 - 4.8 V?
YES- Check the terminal fit at TCM connector terminal C11. If the connection is OK, update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.
NO- Repair open in the wire between TCM connector terminal C11 and the ETC sensor.