DTC Troubleshooting: U0100-00, U0101-00, U0104-00, U0123-00, U0126-00, U0151-00, U0155-00
DTC U0100-00: CAN Communication Failure with ECM/ISU
DTC U0101-00: CAN Communication Failure with TCM
DTC U0104-00: CAN Communication Failure with ACC
DTC U0123-00: CAN Communication Failure with Yaw-Rate/Acceleration Sensor
DTC U0126-00: CAN Communication Failure with Absolute Steering Wheel Angle Sensor
DTC U0151-00: CAN Communication Failure with SRS
DTC U0155-00: CAN Communication Failure with Meter
NOTE:
Before you troubleshoot, review the general troubleshooting information.
Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table.
These DTC(s) may be stored due to a power/ground circuit failure of the appropriate transmitting control unit. Before doing this troubleshooting, check the power/ground circuit of the appropriate transmitting control unit first.

DTC Description
DTC
U0100-00 CAN Communication Failure with ECM/ISU
  
U0101-00 CAN Communication Failure with TCM
  
U0104-00 CAN Communication Failure with ACC
  
U0123-00 CAN Communication Failure with Yaw-Rate/Acceleration Sensor
  
U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor
  
U0151-00 CAN Communication Failure with SRS
  
U0155-00 CAN Communication Failure with Meter
  

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 there 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.

  

Does the CAN gateway detect the VSA modulator-control unit Bus channels A and B?

     
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.
Disconnect the following connectors.
CAN gateway 16P connector
VSA modulator-control unit 46P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 16P connector: disconnected
 
VSA modulator-control unit 46P connector: disconnected
Test point 1
CAN gateway 16P connector (female terminals) No. 3:
Test point 2
VSA modulator-control unit 46P connector No. 20

Test point 1
CAN gateway 16P connector (female terminals) No. 11:
Test point 2
VSA modulator-control unit 46P connector No. 21


Is there continuity?

     
YES
     
     
     
The F-CAN A_H and F-CAN A_L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or replace the VSA modulator-control unit.?
     
NO
     
     
     
Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the VSA modulator-control unit 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.
Disconnect the following connectors.
CAN gateway 16P connector
VSA modulator-control unit 46P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CAN gateway 16P connector: disconnected
 
VSA modulator-control unit 46P connector: disconnected
Test point 1
CAN gateway 16P connector (female terminals) No. 6:
Test point 2
VSA modulator-control unit 46P connector No. 24

Test point 1
CAN gateway 16P connector (female terminals) No. 14:
Test point 2
VSA modulator-control unit 46P connector No. 25


Is there continuity?

     
YES
     
     
     
The F-CAN B_H and F-CAN B_L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or replace the VSA modulator-control unit.?
     
NO
     
     
     
Repair an open in the F-CAN B_H wire or the F-CAN B_L wire between the VSA modulator-control unit 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
U0100-00
PCM
A, B
U0101-00
TCM
A
U0104-00
Millimeter wave radar
B
U0123-00
SRS unit
B
U0126-00
EPS control unit
B
U0151-00
SRS unit
B
U0155-00
Gauge control module
C

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.?
     
U0100-00: PCM is Not Available for Bus A
     
     
     
Go to step 6.
     
U0100-00: PCM is Not Available for Bus B
     
     
     
Go to step 7.
     
U0101-00: TCM is Not Available for Bus A
     
     
     
Go to step 6.
     
U0104-00: Millimeter wave radar is Not Available for Bus B
     
     
     
Go to step 7.
     
U0123-00: SRS unit is Not Available for Bus B
     
     
     
Go to step 7.
     
U0126-00: EPS control unit is Not Available for Bus B
     
     
     
Go to step 7.
     
U0151-00: SRS unit is Not Available for Bus B
     
     
     
Go to step 7.
     
U0155-00: Gauge control module is Not Available for Bus C
     
     
     
Go to step 8.
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
U0100-00
PCM connector A (50P)
U0101-00
TCM 50P connector

NOTE: Before disconnecting the PCM connector, jump the SCS line with the HDS, and wait for more than 1 minute.


?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
Test point 1 (Receiving control unit)
Test point 2 (Transmitting control unit)
Connector
Terminal
Connector
Terminal
U0100-00
F-CAN A_H
CAN gateway 16P connector (female terminals) :
No. 3
PCM connector A (50P)
No. 37
F-CAN A_L
No. 11
No. 36
U0101-00
F-CAN A_H
CAN gateway 16P connector (female terminals) :
No. 3
TCM 50P connector
No. 3
F-CAN A_L
No. 11
No. 11


Is there continuity?

     
YES
     
     
     
The F-CAN A_H wire and the F-CAN A_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.
According to the detected DTC on the following table, substitute or replace the correspond control unit.?
DTC
Operation for transmitting control unit
U0100-00
Substitute a known-good PCM, then recheck. If DTC U0100-00 goes away and the PCM was substituted, replace the original PCM.?
U0101-00
Substitute a known-good TCM, then recheck. If DTC U0101-00 goes away and the TCM was substituted, replace the original TCM.?
     
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
U0100-00
PCM connector A (50P)
U0104-00
Millimeter wave radar 8P connector
U0123-00
SRS unit connector A (39P)
U0126-00
EPS control unit connector B (6P)
U0151-00
SRS unit connector A (39P)

NOTE:

Before disconnecting the PCM connector, jump the SCS line with the HDS, and wait for more than 1 minute.
Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

?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
Test point 1 (Receiving control unit)
Test point 2 (Transmitting control unit)
Connector
Terminal
Connector
Terminal
U0100-00
F-CAN B_H
CAN gateway 16P connector (female terminals) :
No. 6
PCM connector A (50P)
No. 39
F-CAN B_L
No. 14
No. 38
U0104-00
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
U0123-00
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
U0126-00
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
U0151-00
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 continuity?

     
YES
     
     
     
The F-CAN B_H wire and the F-CAN B_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.
According to the detected DTC on the following table, substitute or replace the correspond control unit.?
DTC
Operation for transmitting control unit
U0100-00
Substitute a known-good PCM, then recheck. If DTC U0100-00 goes away and the PCM was substituted, replace the original PCM.?
U0104-00
Substitute a good-known millimeter wave radar, then recheck. If DTC U0104-00 goes away and the millimeter wave radar was substituted, replace the original millimeter wave radar.?
U0123-00
Substitute a known-good SRS unit, then recheck. If DTC U0123-00 goes away and the SRS unit was substituted, replace the original SRS unit.?
U0126-00
Substitute a known-good EPS motor/control unit, then recheck. If DTC U0126-00 goes away and the EPS motor/control unit was substituted, replace the original EPS motor/control unit.?
U0151-00
Substitute a known-good SRS unit, then recheck. If DTC U0151-00 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, F-CAN C_L lines):

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

?2.
Disconnect the following connectors.
CAN gateway 16P connector
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
 
Gauge control module connector A (32P): disconnected
Test point 1
CAN gateway 16P connector (female terminals) No. 5:
Test point 2
Gauge control module connector A (32P) No. 19

Test point 1
CAN gateway 16P connector (female terminals) No. 13:
Test point 2
Gauge control module connector A (32P) No. 20


Is there continuity?

     
YES
     
     
     
The F-CAN C_H and the F-CAN C_L wires are OK. Check for loose terminals in the CAN gateway 16P connector and the gauge control module connector A (32P) connector. If they are OK, substitute a known-good gauge control module, then retest. If the indicators come on then go off after substitution, replace the original gauge control module.?
     
NO
     
     
     
Repair an open in the wire between the gauge control module and the CAN gateway.?