DTC Troubleshooting

DTC Troubleshooting: P2184

DTC P2184: ECT Sensor 2 Circuit Low 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 356 °F (180 °C) or more, or 0.08 V or less 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. Turn the ignition switch to ON (II).

6. Check ECT SENSOR 2 in the DATA LIST with the HDS.

Is about 356 °F (180 °C) or more, or 0.08 V or less indicated?
YES - Go to step 7.

NO - Go to step 11.


7. Turn the ignition switch to LOCK (0).

8. Jump the SCS line with the HDS.

9. Disconnect ECM/PCM connector A (49P).

10. Check for continuity between ECT sensor 2 2P connector terminal No. 2 and body ground.

Is there continuity?
YES - Repair short in the wire between ECT sensor 2 and the ECM/PCM (A34), then go to step 13.

NO - Go to step 18.






11. Turn the ignition switch to LOCK (0).

12. Replace ECT sensor 2. ECT Sensor 2 Replacement

13. Reconnect all connectors.

14. Turn the ignition switch to ON (II).

15. Reset the ECM/PCM with the HDS.

16. Do the ECM/PCM idle learn procedure. ECM/PCM Idle Learn Procedure

17. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2184 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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.


18. Reconnect all connectors.

19. Update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good ECM/PCM. Initial Inspection and Diagnostic Overview

20. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2184 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, Initial Inspection and Diagnostic Overview 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. Service and Repair If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.