DTC Troubleshooting

DTC Troubleshooting: P0560

DTC P0560: 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), or press the engine start/stop button to select the ON mode.

2. Clear the DTC with the HDS.

3. Start the engine, and let it idle.

4. Check for Pending or Confirmed 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 PCM.


5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

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 PCM connector A (49P).

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

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

NO - Repair open in the wire between the 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 PCM connector A (49P).

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

Is there continuity?
YES - Repair short in the wire between the 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), or press the engine start/stop button to select the ON mode.

15. Reset the PCM with the HDS.

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

17. Start the engine, and let it idle.

18. Check for Pending or Confirmed 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 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.


19. Reconnect all connectors.

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

21. Start the engine, and let it idle.

22. Check for Pending or Confirmed 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 PCM. If the PCM updated, substitute a known-good PCM, then go to step 21. 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. PCM Replacement If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.