DTC Troubleshooting: U0100-00, U0101-00, U0123-00, U0126-00, U0151-00, U0155-00 (VSA Control Unit: Without ACC)

DTC Troubleshooting: U0100-00, U0101-00, 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 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
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

Problem verification:

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, then start the engine.

?4.

Check for DTCs with the HDS.

DTC Description	DTC
U0100-00 CAN Communication Failure with ECM/ISU
U0101-00 CAN Communication Failure with TCM
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

Is any of DTC indicated?


	YES

Go to step 2.


	NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control units, and VSA modulator-control unit. Refer to intermittent failures troubleshooting.?

Open wire check (F-CAN_H, F-CAN_L lines):

Open wire check (F-CAN_H, F-CAN_L lines)

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

?2.

Disconnect the following connector.

VSA modulator-control unit 46P connector

?3.

Disconnect the appropriate transmitting control unit connector.

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.

PCM connector A (50P)^*1

PCM connector No. 2 (58P)^*2

TCM 50P connector

SRS unit connector A (39P)

EPS control unit connector B (6P)

Gauge control module connector A (32P)

*1: Except Type-R
*2: Type-R

?4.

Check for continuity between the receiving control unit and the appropriate transmitting control unit on the F-CAN_H circuit and the F-CAN_L circuit (see table).

Test condition

Vehicle OFF (LOCK) mode

DTC	Circuit Name	Receiving Control Unit	Transmitting Control Unit
U0100-00^*1 CAN Communication Failure with ECM/ISU	F-CAN_H	VSA modulator-control unit 46P connector No. 20	PCM connector A (50P) No. 37
U0100-00^*1 CAN Communication Failure with ECM/ISU	F-CAN_L	VSA modulator-control unit 46P connector No. 21	PCM connector A (50P) No. 36
U0100-00^*2 CAN Communication Failure with ECM/ISU	F-CAN_H	VSA modulator-control unit 46P connector No. 20	PCM connector No. 2 (58P) No. 15
U0100-00^*2 CAN Communication Failure with ECM/ISU	F-CAN_L	VSA modulator-control unit 46P connector No. 21	PCM connector No. 2 (58P) No. 27
U0101-00 CAN Communication Failure with TCM	F-CAN_H	VSA modulator-control unit 46P connector No. 20	TCM 50P connector No. 3
U0101-00 CAN Communication Failure with TCM	F-CAN_L	VSA modulator-control unit 46P connector No. 21	TCM 50P connector No. 11
U0123-00 CAN Communication Failure with Yaw-Rate/Acceleration Sensor	F-CAN_H	VSA modulator-control unit 46P connector No. 20	SRS unit connector A (39P) No. 34
	F-CAN_L	VSA modulator-control unit 46P connector No. 21	SRS unit connector A (39P) No. 35
U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor	F-CAN_H	VSA modulator-control unit 46P connector No. 20	EPS control unit connector B (6P) No. 3
	F-CAN_L	VSA modulator-control unit 46P connector No. 21	EPS control unit connector B (6P) No. 1
U0151-00 CAN Communication Failure with SRS	F-CAN_H	VSA modulator-control unit 46P connector No. 20	SRS unit connector A (39P) No. 34
U0151-00 CAN Communication Failure with SRS	F-CAN_L	VSA modulator-control unit 46P connector No. 21	SRS unit connector A (39P) No. 35
U0155-00 CAN Communication Failure with Meter	F-CAN_H	VSA modulator-control unit 46P connector No. 20	Gauge control module connector A (32P) No. 19
U0155-00 CAN Communication Failure with Meter	F-CAN_L	VSA modulator-control unit 46P connector No. 21	Gauge control module connector A (32P) No. 20

*1: Except Type-R
*2: Type-R

Is there continuity?


	YES

The F-CAN_L and F-CAN_H wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.

Refer to the DTC shown on the display, then substitute or replace the control unit based on the instructions (see table).?

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.?
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.?
U0155-00	Substitute a known-good gauge control module, then recheck. If DTC U0155-00 goes away and the gauge control module was substituted, replace the original gauge control module.?


	NO

Repair an open in the F-CAN_L or F-CAN_H wires between the receiving control unit and the appropriate transmitting control unit.?