DTC Troubleshooting

DTC Troubleshooting: P0563

DTC P0563: ECM 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. Turn the ignition switch to LOCK (0).

4. Wait 10 seconds.

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

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

Is DTC P0563 indicated?
YES - Go to step 7.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 and the ECM.


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

8. Jump the SCS line with the HDS.

9. Disconnect ECM connector A (44P).

10. Measure the voltage between ECM connector terminal A6 and body ground.

Is there battery voltage?
YES - Go to step 13.

NO - Go to step 11.






11. Remove PGM-FI main relay 1 (C) from the under-hood fuse/relay box.






12. Check for continuity between ECM connector terminal A6 and body ground.

Is there continuity?
YES - Repair short in the wire between the ECM (A6) and PGM-FI main relay 1, then go to step 16.

NO - Go to step 15.






13. Remove PGM-FI main relay 1 (C) from the under-hood fuse/relay box.






14. Measure the voltage between ECM connector terminal A8 and body ground.

Is there battery voltage?
YES - Repair short to power in the wire between the ECM (A8) and PGM-FI main relay 1, then go to step 16.

NO - Go to step 15.






15. Test PGM-FI main relay 1 Power Relay Test.

Is PGM-FI main relay 1 OK?
YES - Go to step 23.

NO - Replace PGM-FI main relay 1, then go to step 16.


16. Reconnect all connectors.

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

18. Reset the ECM with the HDS.

19. Do the ECM idle learn procedure. ECM Idle Learn Procedure

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

21. Wait 10 seconds.

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

Is DTC P0563 indicated?
YES - Check for poor connections or loose terminals at PGM-FI main relay 1 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.


23. Reconnect all connectors.

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

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

Is DTC P0563 indicated?
YES - Check for poor connections or loose terminals at PGM-FI main relay 1 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.