DTC P2185: ECT Sensor 2 Circuit High Voltage Acura TL IV facelift

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

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1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 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), or press the engine start/stop button to select the OFF mode.
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), or press the engine start/stop button to select the ON mode.
7. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about - 40°F (-40°C) or less, or 4.92 V or more indicated? YES - Go to step 8. NO - Go to step 20 .
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Remove the jumper wire from the ECT sensor 2 2P connector.
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 16 .
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector A (49P).
15. Check for continuity between ECM/PCM connector terminal A27 and ECT sensor 2 2P connector terminal No. 2. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the ECM/PCM (A27) and ECT sensor 2, then go to step 22 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Jump the SCS line with the HDS.
18. Disconnect ECM/PCM connector A (49P).
19. Check for continuity between ECM/PCM connector terminal A21 and ECT sensor 2 2P connector terminal No. 1. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the ECM/PCM (A21) and ECT sensor 2, then go to step 22 .
20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
21. Replace «ECT sensor 2»(ref-512332-S32715485322012103100000) .
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Reset the ECM/PCM with the HDS.
25. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-512362-S04299387872012103100000) ).
26. 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 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.
27. Reconnect all connectors.
28. Update the «ECM/PCM»(ref-512332-S15795428962012103100000) if it does not have the latest software (see «ECM/PCM Update»(ref-512332-S15795428962012103100000) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-512356-S00793962012012103100000) ).
29. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-512356-S00793962012012103100000) ), 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»(ref-512332-S08907075282012103100000) (see «ECM/PCM Replacement»(ref-512332-S08907075282012103100000) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.