DTC U0100, U0122, U0129, U0155 (CVT (TCM): Without ACC)

DTC U0100  : F-CAN Malfunction (TCM - FI Control Module)DTC U0122  : Lost Communication With Vehicle Dynamics Control Module DTC U0129  : Lost Communication With Brake System Control Module DTC U0155  : Lost Communication With Gauge Control Module

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
• Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.
• According to the detected DTC (s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the TCM.

DTC (CVT)

1. 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	Freeze Frame
   U0100 F-CAN Malfunction (TCM - FI Control Module)
   U0122 Lost Communication With Vehicle Dynamics Control Module
   U0129 Lost Communication With Brake System Control Module
   U0155 Lost Communication With Gauge Control Module

   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 and loose terminals between the transmitting control units and the TCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Open wire check (F-CAN A_H line, F-CAN A_L line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. DTC 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
   -	TCM 50P connector
   U0100	PCM connector A (50P)
   U0122	VSA modulator-control unit 46P connector
   U0129	Electric brake booster 26P connector
   U0155	Gauge control module connector A (32P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	TCM 50P 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	TCM 50P connector	No. 3	PCM connector A (50P)	No. 37
   	F-CAN A_L		No. 11		No. 36
   U0122	F-CAN A_H	TCM 50P connector	No. 3	VSA modulator-control unit 46P connector	No. 20
   	F-CAN A_L		No. 11		No. 21
   U0129	F-CAN A_H	TCM 50P connector	No. 3	Electric brake booster 26P connector	No. 26
   	F-CAN A_L		No. 11		No. 18
   U0155	F-CAN A_H	TCM 50P connector	No. 3	Gauge control module connector A (32P)	No. 20
   	F-CAN A_L		No. 11		No. 21

   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	Check for poor connections or loose terminals at the TCM and the PCM. Substitute a known-good PCM , then recheck. If this DTC goes away and the TCM was substituted, replace the original PCM .
   U0122	Check for poor connections or loose terminals at the TCM and the VSA modulator-control unit. Replace the VSA modulator-control unit .
   U0129	Check for poor connections or loose terminals at the TCM and the electric brake booster. Replace the electric brake booster .
   U0155	Check for poor connections or loose terminals at the TCM and the gauge control module. Substitute a known-good gauge control module , then recheck. If this DTC goes away and the gauge control module was substituted, replace the original gauge control module .

   NO 

   Repair an open in the F-CAN A_H wire and/or F-CAN A_L wire between the receiving control unit and the transmitting control unit.