DTC Troubleshooting: U0101-00
DTC U0101-00: Lost Communication With The PCM/TCM
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
U0101-00 Lost Communication With The PCM/TCM
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode.

?4.
Turn the vehicle to the ON mode, then wait for at least 5 seconds.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0101-00 Lost Communication With The PCM/TCM
    

Is DTC U0101-00 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.?
2.
Open wire check (F-CAN_L, F-CAN_H lines):

Open wire check (F-CAN_L, F-CAN_H lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Multipurpose camera unit 20P connector
PCM connector A (51P) connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Multipurpose camera unit 20P connector: disconnected
 
PCM connector A (51P) connector: disconnected
Test point 1
Multipurpose camera unit 20P connector No. 13
Test point 2
PCM connector A (51P) No. 1 (K24W1 engine)
 
PCM connector A (51P) No. 10 (J35Y1 engine)


Is there continuity?

     
YES
     
     
     
The F-CAN_L and F-CAN_H wires are OK. Go to step 3.
     
NO
     
     
     
Repair an open in the wire between the multipurpose camera unit and the PCM.?
3.
PCM check (substitution):

PCM check (substitution)
?1.
Reconnect the following connectors.
Multipurpose camera unit 20P connector
PCM connector A (51P) connector

?2.
Substitute a known-good PCM.

?3.
Clear the DTC with the HDS.


?4.
Turn the vehicle to the OFF (LOCK) mode.

?5.
Turn the vehicle to the ON mode, then wait for at least 5 seconds.

?6.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0101-00 Lost Communication With The PCM/TCM
    

Is DTC U0101-00 indicated?

     
YES
     
     
     
Check for loose terminals and poor connections in the multipurpose camera unit 20P connector. If they are OK, replace the multipurpose camera unit.?
     
NO