P1792

DTC P1792: Problem in Engine Coolant Temperature Sensor Circuit

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

1. Turn the ignition switch ON (II).
2. Check whether the OBD II scan tool indicates code for the engine coolant temperature (ECT) sensor.
Does the OBD II scan tool indicate code for ECT sensor ?
YES-Do the DTC Troubleshooting for the ECT sensor circuit low voltage, and the ECT sensor circuit high voltage. Recheck for DTC P1792 after troubleshooting.
NO-Turn the ignition switch OFF, then go to step 3.
3. Disconnect TCM connectors A (26P) and B (22P).
4. Turn the ignition switch ON (II).





5. Measure the voltage between TCM connector terminals B20 and A4 or A17.
Is there 4.75 - 5.25 V ?
YES-Go to step 6.
NO-Repair open or short in VREF wire between TCM connector terminals B20 and the ECM.





6. Measure the voltage between TCM connector terminals A19 and A4 or A17.
Is there 0.1 - 4.8 V?
YES-Check for I case terminal fit in the TCM connectors. If necessary, substitute a known-good TCM and recheck..
NO-Repair open or short in the wire between TCM connector terminal A19 and the ECT sensor.