DTC Troubleshooting: U0100-00, U0122-00, U0151-00(EPS Control Unit (Without CAN Gateway)) (2017 2018 2019)

DTC U0100-00  : F-CAN Malfunction (EPS Control Unit-PCM/TCM)

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 the power circuit and the ground circuit of the control unit which cannot communicate with the EPS control unit.

DTC (EPS)

1. DTC check

   -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. Wait 10 seconds or more.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   U0100-00 F-CAN Malfunction (EPS Control Unit-PCM/TCM)
   U0122-00 F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)

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

   Is DTC indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . 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_H, F-CAN_L lines)

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

   -2. Disconnect the following connector.

   EPS control unit connector B (6P)

   -3. Disconnect the following connectors according to the detected DTC.

   DTC	Connector
   U0100-00	PCM connector A (51P)
   U0122-00	VSA modulator-control unit 46P connector
   U0151-00	SRS unit connector A (39P)

   NOTE:  Jump the SCS line with the HDS, and wait more than 1 minute when disconnecting the PCM connector.

   -4. Check for continuity between the receiving control unit and the transmitting control unit according to the detected DTC.

   Test condition	Vehicle OFF (LOCK) mode
   	EPS control unit connector B (6P): 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_H	EPS control unit connector B (6P)	No. 3	PCM connector A (51P)	No. 2
   	F-CAN_L		No. 1		No. 1
   U0122-00	F-CAN_H	EPS control unit connector B (6P)	No. 3	VSA modulator-control unit 46P connector	No. 40
   	F-CAN_L		No. 1		No. 28
   U0122-00	F-CAN_H	EPS control unit connector B (6P)	No. 3	SRS unit connector A (39P)	No. 34
   	F-CAN_L		No. 1		No. 35

   Is there continuity?

   YES 

   The F-CAN_H and F-CAN_L wires 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, replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0100-00	PCM
   U0122-00	VSA modulator-control unit
   U0151-00	SRS unit

   NO 

   Repair an open in the wire between the receiving control unit and the transmitting control unit.