DTC Troubleshooting: U0100, U0122, U0151, U0155
DTC U0100: F-CAN Malfunction (TCM - FI Control Module)
DTC U0122: Lost Communication With Vehicle Dynamics Control Module
DTC U0151: Lost Communication With SRS Unit
DTC U0155: Lost Communication With Gauge Control Module
NOTE:
Before you troubleshoot, review the General Troubleshooting Information.
This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.
According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the TCM.
Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0100 F-CAN Malfunction (TCM - FI Control Module)
      
U0122 Lost Communication With Vehicle Dynamics Control Module
      
U0151 Lost Communication With SRS Unit
      
U0155 Lost Communication With Gauge Control Module
      

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.

?5.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0100 F-CAN Malfunction (TCM - FI Control Module)
      
U0122 Lost Communication With Vehicle Dynamics Control Module
      
U0151 Lost Communication With SRS Unit
      
U0155 Lost Communication With Gauge Control Module
      

Are any DTCs indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between the transmitting control units and the TCM. 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_H line, F-CAN_L line):

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

?2.
DTC U0100: Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
DTC U0151: Do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

?4.
Disconnect the following connectors.
TCM 50P connector
DTC U0100: PCM connector A (50P)
DTC U0122: VSA modulator-control unit 46P connector
DTC U0151: SRS unit connector A (39P)
DTC U0155: Gauge control module connector A (32P)

?5.
Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN_H circuit and the F-CAN_L circuit.

Is there continuity?

     
YES
     
     
     
The F-CAN_H wire and the F-CAN_L wire are OK. Replace the control unit based on the instructions (see table).?
DTC
Transmitting control unit
Procedure
U0100
PCM
Replace the PCM
U0122
VSA modulator-control unit
Replace the VSA modulator-control unit
U0151
SRS unit
Replace the SRS unit
U0155
Gauge control module
Replace the gauge control module
     
NO
     
     
     
Repair an open in the F-CAN_H wire and/or F-CAN_L wire between the receiving control unit and the transmitting control unit.?