DTC Troubleshooting
DTC Troubleshooting: P2185 (192)
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 Initial Inspection and Diagnostic Overview.
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 PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect 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 19.
8. Turn the ignition switch to LOCK (0).
9. Remove the jumper wire from ECT sensor 2 2P connector.
10. Turn the ignition switch to ON (II).
11. Measure the 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 17.
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector A (49P).
15. Connect ECT sensor 2 2P connector terminal No. 2 to body ground with a jumper wire.
16. Check for continuity between PCM connector terminal A27 and body ground.
Is there continuity?
YES -
Go to step 26.
NO -
Repair an open in the wire between the PCM (A27) and ECT sensor 2, then go to step 21.
17. Connect ECT sensor 2 2P connector terminal No. 1 to body ground with a jumper wire.
18. Check for continuity between PCM connector terminal A45 and body ground.
Is there continuity?
YES -
Go to step 26.
NO -
Repair an open in the wire between the PCM (A45) and ECT sensor 2, then go to step 21.
19. Turn the ignition switch to LOCK (0).
20. Replace ECT sensor 2 ECT Sensor 2 Replacement.
21. Reconnect all connectors.
22. Turn the ignition switch to ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure PCM Idle Learn Procedure.
25. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2185 indicated?
YES -
Check for poor connections or loose terminals at ECT sensor 2 and the PCM, then go to step 1.
NO -
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
26. Reconnect all connectors.
27. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
28. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2185 indicated?
YES -
Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
NO -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.