DTC Troubleshooting

DTC Troubleshooting: P0560

DTC P0560: ECM/PCM Power Source Circuit Unexpected Voltage

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. Start the engine, and let it idle.

4. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0560 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the No. 19 BACK UP FI ECU (7.5 A) fuse in the under-hood fuse relay box and the ECM/PCM.


5. Turn the ignition switch to LOCK (0).

6. Check the No. 19 BACK UP FI ECU (7.5 A) fuse in the under-hood fuse relay box.

Is the fuse OK?
YES - Go to step 7.

NO - Go to step 10.


7. Jump the SCS line with the HDS.

8. Disconnect ECM/PCM connector A (49P).

9. Measure the voltage between ECM/PCM connector terminal A23 and body ground.

Is there battery voltage?
YES - Go to step 19.

NO - Repair open in the wire between the ECM/PCM (A23) and the No. 19 BACK UP FI ECU (7.5 A) fuse, then go to step 13.






10. Jump the SCS line with the HDS.

11. Disconnect ECM/PCM connector A (49P).

12. Check for continuity between ECM/PCM connector terminal A23 and body ground.

Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A23) and the No. 19 BACK UP FI ECU (7.5 A) fuse. Also replace the No. 19 BACK UP FI ECU (7.5 A) fuse, then go to step 13.

NO - Check the under-hood fuse/relay box, and replace it if needed. Under-Hood Fuse/Relay Box Removal and Installation Also replace the No. 19 BACK UP FI ECU (7.5 A) fuse, then go to step 13.






13. Reconnect all connectors.

14. Turn the ignition switch to ON (II).

15. Reset the ECM/PCM with the HDS.

16. Do the ECM/PCM idle learn procedure. ECM/PCM Idle Learn Procedure

17. Start the engine, and let it idle.

18. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0560 indicated?
YES - Check for poor connections or loose terminals at the No. 19 BACK UP FI ECU (7.5 A) fuse and the ECM/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.


19. Reconnect all connectors.

20. Update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good ECM/PCM. Initial Inspection and Diagnostic Overview

21. Start the engine, and let it idle.

22. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0560 indicated?
YES - Check for poor connections or loose terminals at the No. 19 BACK UP FI ECU (7.5 A) fuse and the ECM/PCM. If the ECM/PCM updated, substitute a known-good ECM/PCM, then go to step 21. 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 Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.