DTC Troubleshooting

DTC Troubleshooting: P0563

DTC P0563: 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. Reading and Clearing Diagnostic Trouble Codes

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 Pending or Confirmed 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 (FI MAIN) and the No. 8 FI ECU (PCM) (15 A) fuse in the under-hood fuse/relay box and the PCM.


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

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector E (31P).

10. Measure the voltage between PCM connector terminal E5 and body ground.

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

NO - Go to step 11.






11. Remove the left kick panel. Interior Trim Removal/Installation - Front Door Sill Area Then remove PGM-FI main relay 1 (FI MAIN) (A) from the driver's under-dash fuse/relay box.






12. Check for continuity between PCM connector terminal E5 and body ground.

Is there continuity?
YES - Repair short in the wire between the PCM (E5) and PGM-FI main relay 1 (FI MAIN), then go to step 20.

NO - Go to step 19.






13. Reconnect PCM connector E (31P).

14. Measure the voltage between PCM connector terminal E5 and body ground.

Is there battery voltage?
YES - Go to step 15.

NO - Go to step 27.






15. Disconnect PCM connector A (31P).

16. Measure the voltage between PCM connector terminal A4 and body ground.

Is there battery voltage?
YES - Go to step 17.

NO - Go to step 27.






17. Remove the left kick panel. Interior Trim Removal/Installation - Front Door Sill Area Then remove PGM-FI main relay 1 (FI MAIN) (A) from the driver's under-dash fuse/relay box.






18. Measure the voltage between PCM connector terminal A4 and body ground.

Is there battery voltage?
YES - Repair short to power in the wire between the PCM (A4) and PGM-FI main relay 1 (FI MAIN), then go to step 20.

NO - Go to step 19.






19. Replace PGM-FI main relay 1 (FI MAIN) (A).

20. Reconnect all connectors.

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

22. Reset the PCM with the HDS.

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

24. Wait 10 seconds.

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

26. Check for Pending or Confirmed DTCs with the HDS.

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






27. Reconnect all connectors.

28. Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Reading and Clearing Diagnostic Trouble Codes

29. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0563 indicated?
YES - Check for poor connections or loose terminals at PGM-FI main relay 1 (FI MAIN) and the PCM. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes then recheck. 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. Service and Repair If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.