## DTC Troubleshooting: P0563 (34-2)

DTC P0563 (34-2): | ECM/PCM Power Source Circuit Unexpected Voltage

1. | Reset the ECM/PCM.

2. | Turn the ignition switch OFF.

3. | Wait 5 seconds.

4. | Turn the ignition switch ON (II). Is DTC P0563 indicated? YES - Go to 5. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the No. 20 (15A) fuse in the under-dash fuse/relay box and at the ECM/ PCM.n

5. | Turn the ignition switch OFF.

6. | Disconnect the negative cable from the battery.

7. | Disconnect ECM/PCM connector E (31P).

8. | Reconnect the negative cable from the battery.

9. | Measure voltage between ECM/PCM connector terminal E7 and body ground. Is there battery voltage? YES - Go to 13. NO - Go to 8.

10. | Remove the driver's side under cover.

11. | Remove the relay holder (A) from the under-dash fuse/relay box, and remove the PGM-FI main relay 1 (brown) (B) from the relay holder (A), after reinstall the relay holder (A) to the under-dash fuse/relay box.

12. | Check for continuity between ECM/PCM connector terminal E7 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E7) and the PGM-FI main relay 1.n NO - Replace the PGM-FI main relay 1.n

13. | Disconnect the negative cable from the battery.

14. | Reconnect ECM/PCM connector E (31P).

15. | Reconnect the negative cable from the battery.

16. | Measure voltage between ECM/PCM connector terminal E7 and body ground. Is there battery voltage? YES - Go to 18. NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/ PCM.n

17. | Disconnect the negative cable from the battery.

18. | Disconnect ECM/PCM connector A (31P).

19. | Reconnect the negative cable from the battery.

20. | Measure voltage between body ground and ECM/PCM connector terminals A3 and A2 individually. Is there battery voltage? YES - Go to 21. NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/ PCM.n

21. | Remove the driver's side under cover.

22. | Remove the relay holder (A) from the under-dash fuse/relay box, and remove the PGM-FI main relay 1 (brown) (B) from the relay holder (A), after reinstall the relay holder (A) to the under-dash fuse/relay box.

23. | Measure voltage between body ground and ECM/PCM connector terminals A3 and A2 individually. Is there battery voltage? YES - Repair short to power in the wire between the ECM/ PCM (A2, A3) and the PGM-FI main relay 1.n NO - Replace the PGM-FI main relay 1.n