DTC Troubleshooting: U0122-00, U0151-00 (Without LKAS (EPS Control Unit))

DTC Troubleshooting: U0122-00, U0151-00

DTC U0122-00: F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)
DTC U0151-00: F-CAN Malfunction (EPS Control Unit-SRS Unit)

NOTE:

	Before you troubleshoot, review the general troubleshooting information.
	According to the detected DTC(s), check for power circuit and ground circuit of the control unit which cannot communicate with the EPS control unit.
	Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table.

DTC Description	DTC	Freeze Frame
U0122-00 F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)
U0151-00 F-CAN Malfunction (EPS Control Unit-SRS Unit)

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 ON mode.

?4.

Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame
U0122-00 F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)
U0151-00 F-CAN Malfunction (EPS Control Unit-SRS Unit)

Is any of DTC indicated?


	YES

Go to step 2.


	NO

Intermittent failure, the system is OK at this time. 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.?

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

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

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

?2.

Disconnect the following connector.

EPS control unit connector B (6P)

?3.

Disconnect the appropriate transmitting control unit connector.

NOTE:Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

DTC	Transmitting Control Unit
U0122-00 F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)	VSA modulator-control unit 46P connector
U0151-00 F-CAN Malfunction (EPS Control Unit-SRS Unit)	SRS unit connector A (39P)

?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
U0122-00 F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)	F-CAN_H	EPS control unit connector B (6P) No. 3	VSA modulator-control unit 46P connector No.20
	F-CAN_L	EPS control unit connector B (6P) No. 1	VSA modulator-control unit 46P connector No. 21
U0151-00 F-CAN Malfunction (EPS Control Unit-SRS Unit)	F-CAN_H	EPS control unit connector B (6P) No. 3	SRS unit connector A (39P) connector No. 34
U0151-00 F-CAN Malfunction (EPS Control Unit-SRS Unit)	F-CAN_L	EPS control unit connector B (6P) No. 1	SRS unit connector A (39P) connector No. 35

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
U0122-00	Replace the VSA modulator-control unit.
U0151-00	Replace the SRS unit.


	NO

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