DTC Troubleshooting: U0100
DTC U0100: Power Control Unit Lost Communication With PCM
DTC Description
DTC
U0100 Power Control Unit Lost Communication With PCM
  

1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Press the engine start/stop button to select the OFF mode and then the ON mode.

?3.
Wait for at least 6 seconds.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
U0100 Power Control Unit Lost Communication With PCM
  

Is DTC U0100 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Open wire check (F CAN lines):

Open wire check (F CAN lines)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connectors.

?4.
Check for continuity between test points 1 and 2 respectively.
K24W1 engine
Test condition
OFF mode
PCM connector A (51P): disconnected
Keyless access control unit connector C (24P): disconnected
Test circuit
F CAN-H
Test point 1
Keyless access control unit connector C (24P) No. 4 (WHT)
Test point 2
PCM connector A (51P) No. 2 (WHT)

Test circuit
F CAN-L
Test point 1
Keyless access control unit connector C (24P) No. 5 (RED)
Test point 2
PCM connector A (51P) No. 1 (RED)

J35Y1, J35Y2 engines
Test condition
OFF mode
PCM connector A (51P): disconnected
Keyless access control unit connector C (24P): disconnected
Test circuit
F CAN-H
Test point 1
Keyless access control unit connector C (24P) No. 4 (WHT)
Test point 2
PCM connector A (51P) No. 9 (WHT)

Test circuit
F CAN-L
Test point 1
Keyless access control unit connector C (24P) No. 5 (RED)
Test point 2
PCM connector A (51P) No. 10 (RED)


Is there continuity?

     
YES
     
     
     
The F CAN wires are OK. Replace the keyless access control unit.?
     
NO
     
     
     
An open or poor connection in the F CAN wires between the PCM and the keyless access control unit.?