DTC Troubleshooting
DTC Troubleshooting: 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).
2. Clear the DTC with the HDS.
3. Check for Temporary 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 ECM.
4. Turn the ignition switch to LOCK (0).
5. Check the No. 21 DBW (THROTTLE ACTUATOR CONTROL) (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 (F) from the under-hood fuse/relay box.
7. Test the ETCS control relay. Power Relay Test
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.
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).
12. Jump the SCS line with the HDS.
13. Disconnect ECM connector C (44P).
14. Check for continuity between ETCS control relay 4P connector terminal No. 2 and ECM connector terminal C1.
Is there continuity?
YES - Go to step 15.
NO - Repair open in the wire between the ECM (C1) and the ETCS control relay, then go to step 23.
15. Disconnect ECM connector A (44P).
16. Check for continuity between ETCS control relay 4P connector terminal No. 3 and ECM connector terminal A20.
Is there continuity?
YES - Go to step 28.
NO - Repair open in the wire between the ECM (A20) and the ETCS control relay, then go to step 23.
17. Remove the ETCS control relay (F) from the under-hood fuse/relay box.
18. Jump the SCS line with the HDS.
19. Disconnect ECM connector C (44P).
20. Check for continuity between ECM connector terminal C1 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (C1) 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).
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II).
25. Reset the ECM with the HDS.
26. Do the ECM idle learn procedure. ECM Idle Learn Procedure
27. Check for Temporary 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 ECM, 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.
28. Reconnect all connectors.
29. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview
30. Check for Temporary 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 ECM. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then recheck. If the ECM was substituted, go to step 1.
NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.