DTC Troubleshooting: P0563 (34)

DTC P0563:  ECM/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.

1.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 7.


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


7.Turn the ignition switch OFF.

8.Jump the SCS line with the HDS.

9.Disconnect ECM/PCM connector A (44P).

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

 

Is there battery voltage?


YES - Go to 13.


NO - Go to 11.


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

 

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

 

Is there continuity?


YES - Repair short in the wire between the ECM/PCM (A6) and PGM-FI main relay 1 (C), then go to 16.


NO - Go to 15.


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

 

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

 

Is there battery voltage?


YES - Repair short to power in the wire between the ECM/PCM (A8) and PGM-FI main relay 1 (C), then go to 16.


NO - Go to 15.


15.Test PGM-FI main relay 1 (C).

Is PGM-FI main relay 1 (C) OK?


YES - Go to 23.


NO - Replace PGM-FI main relay 1 (C), then go to 16.

16.Reconnect all connectors.

17.Turn the ignition switch ON (II).

18.Reset the ECM/PCM with the HDS.

19.Do the ECM/PCM idle learn procedure.

20.Turn the ignition switch OFF.

21.Wait 10 seconds.

22.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 PGM-FI main relay 1 (C) and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n


23.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

24.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 PGM-FI main relay 1 (C) and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n