P0563
DTC P0563: PCM Power Source Circuit Unexpected Voltage1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF.
4. Wait 10 seconds.
5. Turn the ignition switch ON (II).
6. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0563 indicated?
YES - Go to step 7.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the No.6 FI ECU (PCM) (15 A) fuse in the driver's under-dash fuse/relay box and at the PCM.
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector B (56P).
10. Measure voltage between PCM connector terminal B12 and body ground.
Is there battery voltage?
YES - Go to step 14.
NO - Go to step 11.
11. Remove the driver's dashboard lower cover, then remove the PGM-FI main relay 1 (FI MAIN) (A).
12. Remove the ignition coil relay (A) and throttle actuator control module relay (B).
13. Check for continuity between PCM connector terminal B12 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (B12) and the PGM-FI main relay 1 (FI MAIN), then go to step 21.
NO - Go to step 20.
14. Reconnect PCM connector B (56P).
15. Measure voltage between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No.3 and body ground.
Is there battery voltage?
YES - Go to step 16.
NO - Go to step 27.
16. Disconnect PCM connector A (73P).
17. Measure voltage between PCM connector terminal A18 and body ground.
Is there battery voltage?
YES - Go to step 18.
NO - Go to step 27.
18. Remove the driver's dashboard lower cover, then remove the PGM-FI main relay 1 (FI MAIN) (A).
19. Measure voltage between PCM connector terminal A18 and body ground.
Is there battery voltage?
YES - Repair short to power in the wire between the PCM (A18) and the PGM-FI main relay 1 (FI MAIN), then go to step 21.
NO - Go to step 20.
20. Replace the PGM-FI main relay 1 (FI MAIN) (A).
21. Turn the ignition switch ON (II).
22. Clear the DTC with the HDS.
23. Turn the ignition switch OFF.
24. Wait 10 seconds.
25. Turn the ignition switch ON (II).
26. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0563 is indicated, check for poor connections or loose terminals at the PGM-FI main relay 1 (FI MAIN) and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - Troubleshooting is complete.
27. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
28. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0563 is indicated, check for poor connections or loose terminals at the PGM-FI main relay 1 (FI MAIN) and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.