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 terminals 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 ECM/PCM connector E (31P).

7.Measure voltage between ECM/PCM connector terminal E7 and body ground.

 

Is there battery voltage?


YES - Go to 11.


NO - Go to 8.

8.Remove the driver's side under cover.

9.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.

 

10.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


11.Reconnect ECM/PCM connector E (31P).

12.Measure voltage between ECM/PCM connector terminal E7 and body ground.

 

Is there battery voltage?


YES - Go to 13.


NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original  ECM/ PCM.n


13.Disconnect ECM/PCM connector A (31P).

14.Measure voltage between body ground and ECM/PCM connector terminals A3 and A2 individually.

 

Is there battery voltage?


YES - Go to 15.


NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original  ECM/ PCM.n

15.Remove the driver's side under cover.

16.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.

 


17.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