DTC Troubleshooting: U0155
DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)
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
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
      

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.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
      

Is DTC U0155 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 the gauge control module and the PCM.?
2.
Gauge control module DTC check:

Gauge control module DTC check
?1.
Check for gauge control module DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0029 F-CAN Malfunction (BUS-OFF (PCM))
   
U0100 Gauge Control Module Lost Communication with ENG/AT
    

Is DTC U0029 and/or U0100 indicated?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Open wire check (F CAN-H line):

Open wire check (F CAN-H line)
?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.
Test condition
OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
Test circuit
F CAN-H
Test point 1
Gauge control module connector A (32P) No. 19 (WHT)
Test point 2
PCM connector A (51P) No. 9 (WHT)


Is there continuity?

     
YES
     
     
     
The F CAN-H wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the F CAN-H wire between the PCM (A9) and the gauge control module, then do the repair verification.
4.
Open wire check (F CAN-L line):

Open wire check (F CAN-L line)
?1.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
Test circuit
F CAN-L
Test point 1
Gauge control module connector A (32P) No. 20 (RED)
Test point 2
PCM connector A (51P) No. 10 (RED)


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the F CAN-L wire between the PCM (A10) and the gauge control module, then do the repair verification.
Repair verification:

?1.
Reconnect all connectors.

?2.
Exit the SCS mode with the HDS.


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

?4.
Reset the PCM with the HDS.


?5.
Do the PCM idle learn procedure.

?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
      


Is DTC U0155 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at the gauge control module and the PCM, then go to step 1.
     
NO
     
     
     
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?