DTC Troubleshooting: U0100, U0104, U0122, U0131, U0151, U1100
DTC U0100: Gauge Control Module Lost Communication with ENG/AT
DTC U0104: Gauge Control Module Lost Communication with Driving Support System Control Unit
DTC U0122: Gauge Control Module Lost Communication with VSA Modulator-Control Unit
DTC U0131: Gauge Control Module Lost Communication with EPS Unit
DTC U0151: Gauge Control Module Lost Communication with SRS Unit
DTC U1100: Gauge Control Module Lost Communication with Driving Support System Control Unit
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 gauge control module.
Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC Description
DTC
U0100 Gauge Control Module Lost Communication with ENG/AT
  
U0104 Gauge Control Module Lost Communication With Driving Support System Control Unit
  
U0122 Gauge Control Module Lost Communication with VSA Modulator-Control Unit
  
U0131 Gauge Control Module Lost Communication with EPS Unit
  
U0151 Gauge Control Module Lost Communication with SRS Unit
  
U1100 Gauge Control Module Lost Communication with Driving Support System Control Unit
  

1.
CAN gateway system DTC check:

CAN gateway system DTC check
?1.
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:

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

  

Does the gauge control module detect the CAN gateway Bus channels A?

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

Open wire check (F-CAN A lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
CAN gateway 16P connector
Gauge control module 32P connector

?3.
Check for continuity between test points 1 and 2 respectively.
Test condition
Vehicle OFF (LOCK) mode
CAN gateway 16P connector: disconnected
Gauge control module 32P connector: disconnected
Test point 1
CAN gateway 16P connector No. 3
Test point 2
Gauge control module 32P connector No. 21

Test point 1
CAN gateway 16P connector No. 11
Test point 2
Gauge control module 32P connector No. 22


Is there continuity?

     
YES
     
     
     
The F-CAN A_H and F-CAN A_L wires are OK. 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 indicated DTC goes away and the gauge control module was substituted, replace the original gauge control module.?
     
NO
     
     
     
Repair an open in F-CAN A_H or F-CAN A_L wire between the CAN gateway and the gauge control module.?
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
U0100
PCM
A
U0104
U1100
Multipurpose camera unit
B
U0122
VSA modulator-control unit
B
U0131
EPS control unit
B
U0151
SRS unit
B

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.?
     
U0100: PCM is Not Available for Bus A
     
     
     
Go to step 5.
     
U0104, U1100: 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.
     
U0151: SRS unit is Not Available for Bus B
     
     
     
Go to step 6.
5.
Open wire check (F-CAN A lines):

Open wire check (F-CAN A lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

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


?3.
According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).
DTC
Connector
-
CAN gateway 16P connector
U0100
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
Transmitting control unit connector(s) for indicated DTCs: disconnected

DTC
Circuit name
Test point 1 (Receiving control unit)
Test point 2 (Transmitting control unit)
Connector
Terminal
Connector
Terminal
U0100
F-CAN A_H
CAN gateway 16P connector
No. 3
PCM connector A (51P)
No. 2
F-CAN A_L
No. 11
No. 1


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 substitute or replace the correspond control unit.?
DTC
Operation for transmitting control unit
U0100
Substitute a known-good PCM, then recheck. If DTC U0100 goes away after substitution, replace the original PCM.
     
NO
     
     
     
Repair an open in F-CAN A_H or F-CAN A_L wire between the CAN gateway and the transmitting control unit.?
6.
Open wire check (F-CAN B lines):

Open wire check (F-CAN B lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
U0151: Do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

?3.
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)
U0151
SRS unit connector A (39P)

?4.
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
Test point 1 (Receiving control unit)
Test point 2 (Transmitting control unit)
Connector
Terminal
Connector
Terminal
U0104
U1100
F-CAN B_H
CAN gateway 16P connector
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
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
No. 6
EPS control unit connector B (6P)
No. 4
F-CAN B_L
No. 14
No. 3
U0151
F-CAN B_H
CAN gateway 16P connector
No. 6
SRS unit connector A (39P)
No. 34
F-CAN B_L
No. 14
No. 35


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 substitute or replace the correspond control unit.?
DTC
Operation for transmitting control unit
U0104
U1100
Substitute a known-good multipurpose camera unit, then recheck. If DTC U129C goes away after substitution, replace the original multipurpose camera unit.
U0122
Replace the VSA modulator-control unit.
U0131
Substitute a known-good EPS control unit, then recheck. If DTC U0131 goes away after substitution, replace the original EPS control unit.
U0151
Substitute a known-good SRS unit, then recheck. If DTC U0151 goes away after substitution, replace the original SRS unit.
     
NO
     
     
     
Repair an open in F-CAN B_H or F-CAN B_L wire between the CAN gateway and the transmitting control unit.?