DTC P1659: ETCS Control Relay OFF Malfunction Honda Pilot II

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 268

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed DTCs or DTCs with the HDS. Is DTC P1659 indicated? YES - Go to step 4 . NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ETCS control relay and the-PCM.
4. Turn the ignition switch to LOCK (0).
5. Check the No. 21 DBW (THROTTLE ACTUATOR CONTROL) (15A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 6 . NO - Go to step 17
6. Remove the ETCS control relay (F) from the under-hood fuse/relay box.
7. Test the ETCS control relay (see «POWER RELAY TEST»(ref-333609-S14631099402009072100000) ). Is the ETCS control relay OK? YES - Go to step 8 . NO - Replace the ETCS control relay, then go to step 23
8. Turn the ignition switch to ON (II).
9. Measure the voltage between ETCS control relay 4P connector terminal No. 4 and body ground.
10. Measure the voltage between ETCS control relay 4P connector terminal No. 1 and body ground.
11. Turn the ignition switch to LOCK (0).
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (49P).
14. Check for continuity between ETCS control relay 4P connector terminal No. 2 and PCM connector terminal C4.
15. Disconnect PCM connector A (49P).
16. Check for continuity between ETCS control relay 4P connector terminal No. 3 and PCM connector terminal A29.
17. Remove the ETCS control relay (F) from the under-hood fuse/relay box.
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector C (49P).
20. Check for continuity between PCM connector terminal C4 and body ground.
21. Check for continuity between ETCS control relay 4P connector terminal No. 1 and body ground.
22. Turn the ignition switch to LOCK (0).
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II).
25. Reset the PCM with the HDS.
26. Do «PCM IDLE LEARN PROCEDURE»(ref-333561-S36442749152009072100000) .
27. Check for Pending or Confirmed DTCs or DTCs with the HDS. Is DTC P1659 indicated? YES - Check for poor connections or loose terminals at the ETCS control relay and the PCM, then go to step 1 NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
28. Reconnect all connectors.
29. Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-333558-S24141467512009072100000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-333557-S35070474232009072100000) ).
30. Check for Pending or Confirmed DTCs or DTCs with the HDS.

Is DTC P1659 indicated?

YES - Check for poor connections or loose terminals at the ETCS control relay and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE 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 (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.