DTC Troubleshooting

DTC P2185: ECT Sensor 2 Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch to ON (II).
2. Check ECT SENSOR 2 in the DATA LIST with the HDS.

Is about -40 °F (-40 °C) or less, or 4.90 V or more Indicated?

YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the ECM/PCM.

3. Turn the ignition switch to LOCK (0).
4. Disconnect the ECT sensor 2 2P connector.
5. Connect ECT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire.






6. Turn the ignition switch to ON (II).
7. Check ECT SENSOR 2 in the DATA LIST with the HDS.

Is about -40 °F (-40 °C) or less, or 4.90 V or more indicated?

YES - Go to step 8.

NO - Go to step 20.

8. Turn the ignition switch to LOCK (0).
9. Remove the jumper wire from the ECT sensor 2 2P connector.
10. Turn the ignition switch to ON (II).
11. Measure voltage between ECT sensor 2 2P connector terminal No. 1 and body ground.






Is there about 5 V?

YES - Go to step 12.

NO - Go to step 16.

12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector A (49P).
15. Check for continuity between ECT sensor 2 2P connector terminal No. 2 and ECM/PCM connector terminal A10.






Is there continuity?

YES - Go to step 27.

NO - Repair open in the wire between the ECM/PCM (A10) and ECT sensor 2, then go to step 22.

16. Turn the ignition switch to LOCK (0).
17. Jump the SCS line with the HDS.
18. Disconnect ECM/PCM connector A (49P).
19. Check for continuity between ECT sensor 2 2P connector terminal No. 1 and ECM/PCM connector terminal A34.






Is there continuity?

YES - Go to step 27.

NO - Repair open in the wire between the ECM/PCM (A34) and ECT sensor 2, then go to step 22.

20. Turn the ignition switch to LOCK (0).
21. Replace ECT sensor 2.
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II).
24. Reset the ECM/PCM with the HDS.
25. Do the ECM/PCM idle learn procedure. Programming and Relearning
26. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2185 indicated?

YES - Check for poor connections or loose terminals at ECT sensor 2 and the ECM/PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

27. Reconnect all connectors.
28. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
29. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2185 indicated?

YES - Check for poor connections or loose terminals at ECT sensor 2 and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then recheck. If the ECM/PCM was substituted, go to step 1.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.