DTC Troubleshooting: P0563
DTC P0563: 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.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0563 PCM Power Source Circuit Unexpected Voltage
      

1.
Problem verification:

Problem verification
?1.
Press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Press the engine start/stop button to select the OFF mode.

?4.
Wait 10 seconds.

?5.
Press the engine start/stop button to select the ON mode.

?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0563 PCM Power Source Circuit Unexpected Voltage
      

Is DTC P0563 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 and the PCM.?
2.
Determine possible failure area (FI MAIN RLY OUT line, others):

Determine possible failure area (FI MAIN RLY OUT line, others)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

?4.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode
 
PCM connector A (51P): disconnected
Test circuit
FI MAIN RLY CL-
Test point 1
PCM connector A (51P) No. 7 (ORN)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 3.
3.
Shorted wire check (FI MAIN RLY CL- line):

Shorted wire check (FI MAIN RLY CL- line)
?1.
Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.


?2.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
PCM connector A (51P): disconnected
 
PGM-FI main relay 1: disconnected
Test circuit
FI MAIN RLY CL-
Test point 1
PCM connector A (51P) No. 7 (ORN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the FI MAIN RLY CL- wire between the PCM (A7) and PGM-FI main relay 1, then do the repair verification.
     
NO
     
     
     
The FI MAIN RLY CL- wire is OK. Go to step 4.
4.
Relay check:

Relay check
?1.
Test PGM-FI main relay 1.

Is PGM-FI main relay 1 OK?

     
YES
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
     
NO
     
     
     
Replace PGM-FI main relay 1, then do the repair verification.
5.
Shorted wire check (IGP/FI MAIN RLY OUT line to power):

Shorted wire check (IGP/FI MAIN RLY OUT line to power)
?1.
Disconnect the following connector.

?2.
Remove PGM-FI main relay 1 (A) from the under-dash fuse/relay box.


?3.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode
PCM connector A (51P): disconnected
PCM connector B (51P): disconnected
PGM-FI main relay 1: disconnected
Test circuit
IGP
Test point 1
PCM connector B (51P) No. 10 (YEL)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Repair a short to power in the IGP/FI MAIN RLY OUT wire between the PCM (B10) and PGM-FI main relay 1, then do the repair verification.
     
NO
     
     
     
The IGP/FI MAIN RLY OUT wire is OK. Go to step 6.
6.
Relay check:

Relay check
?1.
Test PGM-FI main relay 1.

Is PGM-FI main relay 1 OK?

     
YES
     
     
     
PGM-FI main relay 1 is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
     
NO
     
     
     
Replace PGM-FI main relay 1, then do the repair verification.
Repair verification:

?1.
Press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Exit the SCS mode with the HDS.


?4.
Press the engine start/stop button to select the ON mode.

?5.
Reset the PCM with the HDS.


?6.
Do the PCM idle learn procedure.

?7.
Press the engine start/stop button to select the OFF mode.

?8.
Wait 10 seconds.

?9.
Press the engine start/stop button to select the ON mode.

?10.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0563 PCM Power Source Circuit Unexpected Voltage
     


Is DTC P0563 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at PGM-FI main relay 1 and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
     
NO
     
     
     
Troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?