DTC Troubleshooting
DTC Troubleshooting: P1659, P1659
DTC P1659:
ETCS Control Relay OFF Malfunction
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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed 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 ECM/PCM.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Check the No. 18 DBW (ETCS) (15 A) 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 (A) from the under-hood fuse/relay box.
7. Test the ETCS control relay Testing and Inspection.
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), or press the engine start/stop button to select the ON mode.
9. Measure the voltage between ETCS control relay 4P connector terminal No. 4 and body ground.
Is there battery voltage?
YES -
Go to step 10.
NO -
Replace the under-hood fuse/relay box Under-Hood Fuse/Relay Box Removal and Installation, then go to step 22.
10. Measure the voltage between ETCS control relay 4P connector terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to step 11.
NO -
Replace the under-hood fuse/relay box Under-Hood Fuse/Relay Box Removal and Installation, then go to step 22.
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector C (49P).
14. Check for continuity between ETCS control relay 4P connector terminal No. 2 and ECM/PCM connector terminal C4.
Is there continuity?
YES -
Go to step 15.
NO -
Repair open in the wire between the ECM/PCM(C4) and the ETCS control relay, then go to step 23.
15. Disconnect ECM/PCM connector A (49P).
16. Check for continuity between ETCS control relay 4P connector terminal No. 3 and ECM/PCM connector terminal A29.
Is there continuity?
YES -
Go to step 28.
NO -
Repair open in the wire between the ECM/PCM(A29) and the ETCS control relay, then go to step 23.
17. Remove the ETCS control relay (A) from the under-hood fuse/relay box.
18. Jump the SCS line with the HDS.
19. Disconnect ECM/PCM connector C (49P).
20. Check for continuity between ECM/PCM connector terminal C4 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM(C4) and the ETCS control relay, then go to step 23.
NO -
Go to step 21.
21. Check for continuity between ETCS control relay 4P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Replace the under-hood fuse/relay box Under-Hood Fuse/Relay Box Removal and Installation, then go to step 23.
NO -
Go to step 28.
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
25. Reset the ECM/PCM with the HDS.
26. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.
27. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1659 indicated?
YES -
Check for poor connections or loose terminals at the ETCS control relay 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.
28. Reconnect all connectors.
29. Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM.
30. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1659 indicated?
YES -
Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, 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.