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