DTC P2185: ECT Sensor 2 Circuit High Voltage Acura RL 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 ).

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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 18 .
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 E (31P).
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 E1 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the PCM (E1) and ECT sensor 2, then go to step 20 .
17. Measure the voltage between PCM connector terminal B24 and body ground. Is there about 5 V? YES -Repair open in the wire between the PCM (B24) and ECT sensor 2, then go to step 20 . NO -Go to step 25 .
18. Turn the ignition switch to LOCK (0).
19. Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(ref-348508-S25200254742009112400000) ).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-348529-S13364648212009112400000) ).
24. 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 PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-348508-S21120732372009112400000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ).
27. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ), 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-348508-S08692035992009112400000) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.