DTC Troubleshooting: U0104, U0122, U0131, U0155, U129E
DTC U0104: F-CAN Malfunction (PCM - ACC Unit / Multipurpose Camera Unit)
DTC U0122: F-CAN Malfunction (PCM-VSA Modulator-Control Unit)
DTC U0131: F-CAN Malfunction (PCM-EPS Control 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.

DTC Description
Confirmed DTC
Pending DTC
U0104 F-CAN Malfunction (PCM - ACC Unit / Multipurpose Camera Unit)
    
U0122 F-CAN Malfunction (PCM-VSA Modulator-Control Unit)
    
U0131 F-CAN Malfunction (PCM-EPS Control Unit)
    
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
    
U129E F-CAN Malfunction (PCM-Power Control Unit (PCU))
    

1.
CAN gateway system DTC check:

CAN gateway system DTC check
?1.
Turn the vehicle to the ON mode.

?2.
Check for CAN gateway system DTCs with the HDS.
DTC Description
DTC
U0029-00 CAN Gateway F-CAN ch A Bus Off
  
U0047-00 CAN Gateway F-CAN ch B Bus Off
  
U3000-49 CAN Gateway Internal Failure
  


Is DTC U0029-00, U0047-00 and/or U3000-49 indicated?

     
YES
     
     
     
     
NO
     
     
     
Go to step 2.
2.
F-CAN circuit communication check (Receiving control unit):

F-CAN circuit communication check (Receiving control unit)
?1.
Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

  

Which result is indicated?

     
Bus A is Not Available
     
     
     
Go to step 3.
     
Bus A is Available
     
     
     
Go to step 4.
3.
Open wire check (F-CAN A_H line, F-CAN A_L line):

Open wire check (F-CAN A_H line, F-CAN A_L line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

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


?3.
Disconnect the following connectors.
CAN gateway 16P connector
PCM connector A (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 16P connector: disconnected
 
PCM connector A (51P): disconnected
Test point 1
CAN gateway 16P connector (female terminals) No. 3:
Test point 2
PCM connector A (51P) No. 2

Test point 1
CAN gateway 16P connector (female terminals) No. 11:
Test point 2
PCM connector A (51P) No. 1


Is there continuity?

     
YES
     
     
     
The F-CAN A_H wire and the F-CAN A_L wire are OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If indicated DTC goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the PCM (A1, A2) and the CAN gateway.?
4.
F-CAN circuit communication check (Transmitting control unit):

F-CAN circuit communication check (Transmitting control unit)
?1.
Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

  

?2.
According to the detected DTC on the following table, make sure that the transmitting control unit detects the CAN gateway Bus channel(s) normally.
DTC
Transmitting control unit
Detected CAN gateway Bus channel(s) at normal
U0104
Multipurpose camera unit
B
U0122
VSA modulator-control unit
B
U0131
EPS control unit
B
U0155
Gauge control module
A
U129E
Keyless access control unit
A

Is it detected normally?

     
Detected normal
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control unit and the CAN gateway.?
     
U0104: Multipurpose camera unit is Not Available for Bus B
     
     
     
Go to step 6.
     
U0122: VSA modulator-control unit is Not Available for Bus B
     
     
     
Go to step 6.
     
U0131: EPS control unit is Not Available for Bus B
     
     
     
Go to step 6.
     
U0155: Gauge control module is Not Available for Bus A
     
     
     
Go to step 5.
     
U129E: Keyless access control unit is Not Available for Bus A
     
     
     
Go to step 5.
5.
Open wire check (F-CAN A_H line, F-CAN A_L line):

Open wire check (F-CAN A_H line, F-CAN A_L line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).
DTC
Connector
-
CAN gateway 16P connector
U0155
Gauge control module 32P connector
U129E
Keyless access control unit connector C (20P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 16P connector: disconnected
 
Transmitting control unit connector(s) for indicated DTCs: disconnected

DTC
Circuit name
Receiving control unit
Transmitting control unit
Connector
Terminal
Connector
Terminal
U0155
F-CAN A_H
CAN gateway 16P connector (female terminals):
No. 3
Gauge control module 32P connector
No. 21
F-CAN A_L
No. 11
No. 22
U129E
F-CAN A_H
CAN gateway 16P connector (female terminals):
No. 3
Keyless access control unit connector C (20P)
No. 2
F-CAN A_L
No. 11
No. 12


Is there continuity?

     
YES
     
     
     
The F-CAN A_H wire and the F-CAN A_L wire are OK.
According to the detected DTC on the following table, update, substitute, or replace the correspond control unit.?
DTC
Operation for transmitting control unit
U0155
Check for poor connections or loose terminals at the CAN gateway and the gauge control module. Substitute a known-good gauge control module, then recheck. If DTC U0155 goes away and the gauge control module was substituted, replace the original gauge control module.
U129E
Check for poor connections or loose terminals at the CAN gateway and the keyless access control unit. Substitute a known-good keyless access control unit, then recheck. If DTC U129E goes away and the keyless access control unit was substituted, replace the original keyless access control unit.
     
NO
     
     
     
Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the transmitting control unit and the CAN gateway.?
6.
Open wire check (F-CAN B_H line, F-CAN B_L line):

Open wire check (F-CAN B_H line, F-CAN B_L line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).
DTC
Connector
-
CAN gateway 16P connector
U0104
Multipurpose camera unit 20P connector
U0122
VSA modulator-control unit 38P connector
U0131
EPS control unit connector B (6P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 16P connector: disconnected
 
Transmitting control unit connector(s) for indicated DTCs: disconnected

DTC
Circuit name
Receiving control unit
Transmitting control unit
Connector
Terminal
Connector
Terminal
P0104
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
Multipurpose camera unit 20P connector
No. 2
F-CAN B_L
No. 14
No. 13
U0122
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
VSA modulator-control unit 38P connector
No. 38
F-CAN B_L
No. 14
No. 26
U0131
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
EPS control unit connector B (6P)
No. 4
F-CAN B_L
No. 14
No. 3


Is there continuity?

     
YES
     
     
     
The F-CAN B_H wire and the F-CAN B_L wire are OK.
According to the detected DTC on the following table, update, substitute, or replace the correspond control unit.?
DTC
Operation for transmitting control unit
U0104
Check for poor connections or loose terminals at the CAN gateway and the multipurpose camera unit. Substitute a known-good multipurpose camera unit, then recheck. If DTC U0104 goes away and the multipurpose camera unit was substituted, replace the original multipurpose camera unit.
U0122
Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit.
U0131
Check for poor connections or loose terminals at the CAN gateway and the EPS control unit. Replace the original EPS control unit.
     
NO
     
     
     
Repair an open in the F-CAN B_H wire or the F-CAN B_L wire between the transmitting control unit and the CAN gateway.?