DTC P2185: ECT Sensor 2 Circuit High Voltage Acura MDX II facelift

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

Scheme 141

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Scheme 144

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 4.92 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 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 4.92 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 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).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector A (49P).
15. Check for continuity between PCM connector terminal A27 and ECT sensor 2 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (A27) 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 PCM connector A (49P).
19. Check for continuity between PCM connector terminal A21 and ECT sensor 2 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (A21) and ECT sensor 2, then go to step 22 .
20. Turn the ignition switch to LOCK (0).
21. Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(ref-510432-S21893342762012102300000) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-510456-S37172493852012102300000) ).
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 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»(ref-510432-S17608727802012102300000) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-510432-S36085130492012102300000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-510452-S32404884522012102300000) ).
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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-510452-S32404884522012102300000) ), 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 (see «PCM REPLACEMENT»(ref-510432-S18664843072012102300000) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(ref-510432-S17608727802012102300000) .