DTC Troubleshooting: U0101, U0122, U0128, U0131, U0151, U0155, U129E
DTC U0101: F-CAN Malfunction (PCM-TCM)
DTC U0122: F-CAN Malfunction (PCM-VSA Modulator-Control Unit)
DTC U0128: F-CAN Malfunction (PCM-Electric Parking Brake Control Unit)
DTC U0131: F-CAN Malfunction (PCM-EPS Control Unit)
DTC U0151: F-CAN Malfunction (PCM-SRS Unit)
DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)
DTC U129E: F-CAN Malfunction (PCM-Power Control Unit (PCU))
NOTE:
Before you troubleshoot, review the general troubleshooting information.
According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the PCM.
Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.
Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC Description
Confirmed DTC
Pending DTC
U0101 F-CAN Malfunction (PCM-TCM)
    
U0122 F-CAN Malfunction (PCM-VSA Modulator-Control Unit)
    
U0128 F-CAN Malfunction (PCM- Electric Parking Brake Control Unit)
    
U0131 F-CAN Malfunction (PCM-EPS Control Unit)
    
U0151 F-CAN Malfunction (PCM-SRS Unit)
    
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
    
U129E F-CAN Malfunction (PCM-Power Control Unit (PCU))
    

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
U0101 F-CAN Malfunction (PCM-TCM)
    
U0122 F-CAN Malfunction (PCM-VSA Modulator-Control Unit)
    
U0128 F-CAN Malfunction (PCM- Electric Parking Brake Control Unit)
    
U0131 F-CAN Malfunction (PCM-EPS Control Unit)
    
U0151 F-CAN Malfunction (PCM-SRS Unit)
    
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
    
U129E F-CAN Malfunction (PCM-Power Control Unit (PCU))
    

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 or loose terminals at the transmitting control units and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the 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.
Disconnect the receiving control unit connector(s).
NOTE: Jump the SCS line with the HDS, and wait more than 1 minute when removing the PCM connector(s).

PCM connector A (50P)

?3.
Disconnect the transmitting control unit connector(s).
Refer to the DTC shown on the display, then disconnect the connector(s) based on the instructions (see table).

DTC
Connector
U0101
TCM 50P connector
U0122
VSA modulator-control unit 46P connector
U0128
VSA modulator-control unit 46P connector
U0131
EPS control unit connector B (6P)
U0151
SRS unit connector A (39P)
U0155
Gauge control module connector A (32P)
U129E
Body control module connector B (36P)

?4.
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.
Test condition
Vehicle OFF (LOCK) mode
 
Receiving control unit connector(s): disconnected
 
Transmitting control unit connector(s) for indicated DTCs: disconnected

DTC
Circuit name
Receiving control unit
Transmitting control unit
Connector
Terminal
Connector
Terminal
U0101
F-CAN_H
PCM connector A (50P)
No. 37
TCM 50P connector
No. 3
F-CAN_L
No. 36
No. 11
U0122
F-CAN_H
PCM connector A (50P)
No. 37
VSA modulator-control unit 46P connector
No. 20
F-CAN_L
No. 36
No. 21
U0128
F-CAN_H
PCM connector A (50P)
No. 37
VSA modulator-control unit 46P connector
No. 20
F-CAN_L
No. 36
No. 21
U0131
F-CAN_H
PCM connector A (50P)
No. 37
EPS control unit connector B (6P)
No. 3
F-CAN_L
No. 36
No. 1
U0151
F-CAN_H
PCM connector A (50P)
No. 37
SRS unit connector A (39P)
No. 34
F-CAN_L
No. 36
No. 35
U0155
F-CAN_H
PCM connector A (50P)
No. 37
Gauge control module connector A (32P)
No. 19
F-CAN_L
No. 36
No. 20
U129E
F-CAN_H
PCM connector A (50P)
No. 37
Body control module connector B (36P)
No. 22
F-CAN_L
No. 36
No. 23

Is there continuity?

     
YES
     
     
     
The F-CAN_H wire and the F-CAN_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.
Refer to the DTC shown on the display, then substitute or replace the control unit based on the instructions (see table).?
DTC
Operation for transmitting control unit
U0101
Substitute a known-good TCM, then recheck. If DTC U0101 goes away after substitution, replace the original TCM.
U0122
Replace the VSA modulator-control unit.
U0128
Replace the VSA modulator-control unit.
U0131
Replace the EPS control unit.
U0151
Substitute the SRS unit. If DTC U0151 goes away after substitution, replace the original SRS unit.
U0155
Substitute a known-good gauge control module, then recheck. If DTC U0155 goes away after substitution, replace the original gauge control module.
U129E
Substitute a known-good body control module, then recheck. If DTC U129E goes away after substitution, replace the original body control module.
     
NO
     
     
     
Repair an open in the F-CAN_H wire and/or the F-CAN_L wire between the receiving control unit and the transmitting control unit.?