DTC Troubleshooting: U0104, U0122, U0128, U0131, U0151, U0155, U129E
DTC U0104: F-CAN Malfunction (PCM-Driving Support System Control Unit)
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.

DTC Description
Confirmed DTC
Pending DTC
U0104 F-CAN Malfunction (PCM-Driving Support System Control Unit)
    
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.
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
   

Are any DTCs 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 B is Not Available
     
     
     
Go to step 4.
     
Bus A and B are Available
     
     
     
Go to step 5.
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 No. 2 (58P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 16P connector: disconnected
 
PCM connector No. 2 (58P): disconnected
Test point 1
CAN gateway 16P connector (female terminals) No. 3:
Test point 2
PCM connector No. 2 (58P) No. 15

Test point 1
CAN gateway 16P connector (female terminals) No. 11:
Test point 2
PCM connector No. 2 (58P) No. 27


Is there 1.0 ? or less?

     
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 PCM connector No. 2 terminal (No. 15, No. 27) and the CAN gateway.?
4.
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.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connectors.
CAN gateway 16P connector
PCM connector No. 2 (58P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 16P connector: disconnected
 
PCM connector No. 2 (58P): disconnected
Test point 1
CAN gateway 16P connector (female terminals) No. 6:
Test point 2
PCM connector No. 2 (58P) No. 29

Test point 1
CAN gateway 16P connector (female terminals) No. 14:
Test point 2
PCM connector No. 2 (58P) No. 17


Is there 1.0 ? or less?

     
YES
     
     
     
The F-CAN B_H wire and the F-CAN B_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 B_H wire or the F-CAN B_L wire between PCM connector No. 2 terminal (No. 17, No. 29) and the CAN gateway.?
5.
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
Millimeter wave radar
B
U0122
VSA modulator-control unit
A, B
U0128
VSA modulator-control unit
A, B
U0131
EPS control unit
B
U0151
SRS unit
B
U0155
Gauge control module
C
U129E
Body control module
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: Millimeter wave radar is Not Available for Bus B
     
     
     
Go to step 7.
     
U0122: VSA modulator-control unit is Not Available for Bus A
     
     
     
Go to step 6.
     
U0122: VSA modulator-control unit is Not Available for Bus B
     
     
     
Go to step 7.
     
U0128: VSA modulator-control unit is Not Available for Bus A
     
     
     
Go to step 6.
     
U0128: VSA modulator-control unit is Not Available for Bus B
     
     
     
Go to step 7.
     
U0131: EPS control unit is Not Available for Bus B
     
     
     
Go to step 7.
     
U0151: SRS unit is Not Available for Bus B
     
     
     
Go to step 7.
     
U0155: Gauge control module is Not Available for Bus C
     
     
     
Go to step 8.
     
U129E: body control module is Not Available for Bus A
     
     
     
Go to step 6.
6.
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
U0122
VSA modulator-control unit 46P connector
U0128
VSA modulator-control unit 46P connector
U129E
Body control module connector B (36P)

?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
U0122
F-CAN A_H
CAN gateway 16P connector (female terminals):
No. 3
VSA modulator-control unit 46P connector
No. 20
F-CAN A_L
No. 11
No. 21
U0128
F-CAN A_H
CAN gateway 16P connector (female terminals):
No. 3
VSA modulator-control unit 46P connector
No. 20
F-CAN A_L
No. 11
No. 21
U129E
F-CAN A_H
CAN gateway 16P connector (female terminals):
No. 3
Body control module connector B (36P)
No. 22
F-CAN A_L
No. 11
No. 23


Is there 1.0 ? or less?

     
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
U0122
Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit.
U0128
Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit.
U129E
Check for poor connections or loose terminals at the CAN gateway and the body control module. Substitute a known-good body control module, then recheck. If DTC U129E goes away and the body control module was substituted, replace the original body control module.
     
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.?
7.
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
Millimeter wave radar 8P 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)

?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
U0104
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
Millimeter wave radar 8P connector
No. 7
F-CAN B_L
No. 14
No. 6
U0122
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
VSA modulator-control unit 46P connector
No. 24
F-CAN B_L
No. 14
No. 25
U0128
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
VSA modulator-control unit 46P connector
No. 24
F-CAN B_L
No. 14
No. 25
U0131
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
EPS control unit connector B (6P)
No. 3
F-CAN B_L
No. 14
No. 1
U0151
F-CAN B_H
CAN gateway 16P connector (female terminals):
No. 6
SRS unit connector A (39P)
No. 34
F-CAN B_L
No. 14
No. 35


Is there 1.0 ? or less?

     
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 millimeter wave radar. Replace the millimeter wave radar.
U0122
Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit.
U0128
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 EPS control unit.
U0151
Check for poor connections or loose terminals at the CAN gateway and the SRS unit. Substitute the SRS unit, then recheck. If DTC U0151 goes away and the SRS unit was substituted, replace the original SRS 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.?
8.
Open wire check (F-CAN C_H line, F-CAN C_L line):

Open wire check (F-CAN C_H line, F-CAN C_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 connector A (32P)

?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 C_H
CAN gateway 16P connector (female terminals):
No. 5
Gauge control module connector A (32P)
No. 19
F-CAN C_L
No. 13
No. 20


Is there 1.0 ? or less?

     
YES
     
     
     
The F-CAN C_H wire and the F-CAN C_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.
     
NO
     
     
     
Repair an open in the F-CAN C_H wire or the F-CAN C_L wire between the transmitting control unit and the CAN gateway.?