DTC U0100, U0122 (Keyless Access Power Control Unit without CAN gateway)

DTC U0100  : Power Control Unit (Body Control Module) Lost Communication with PCM

DTC U0122:  Power Control Unit (Body Control Module) Lost Communication with VSA Modulator-Control Unit (VSA Message)

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 body control module.
• Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC (Power Control Unit)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTCs with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   -4. Wait for at least 6 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100 Power Control Unit (Body Control Module) Lost Communication with PCM
   U0122 Power Control Unit (Body Control Module) Lost Communication with VSA Modulator-Control Unit (VSA Message)

   Are any DTCs 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 the gauge control module.

2. Open wire check (F-CAN_H line, F-CAN_L line)

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

   -2. Disconnect the following connector.

   Body control module connector B (36P)

   -3. U0100: Jump the SCS line with the HDS, and wait more than 1 minute.

   SCS short

   -4. Disconnect the transmitting control unit connector(s).

   Refer to the DTC shown on the display, then disconnect the connector(s) based on the instructions (see table).

   DTC	Connector
   U0100	PCM connector A (50P) *1/*3 PCM connector No. 2 (58P) *2
   U0122	VSA modulator-control unit 46P connector

   *1: L15B7/L15BA/L15BY engine

   *2: K20C1 engine

   *3: K20C2 engine

   -5. Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN_H circuit and the F-CAN_L circuit.

   Test condition

   Receiving control unit connector(s): disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Receiving control unit		Transmitting control unit
   		Connector	Terminal	Connector	Terminal
   U0100 *1/*3	F-CAN_H	Body control module connector B (36P)	No. 22	PCM connector A (50P)	No. 37
   	F-CAN_L		No. 23		No. 36
   U0100 *2	F-CAN_H	Body control module connector B (36P)	No. 22	PCM connector No. 2 (58P)	No. 15
   	F-CAN_L		No. 23		No. 27
   U0122	F-CAN_H	Body control module connector B (36P)	No. 22	VSA modulator-control unit 46P connector	No. 20
   	F-CAN_L		No. 23		No. 21

   *1: L15B7/L15BA/L15BY engine

   *2: K20C1 engine

   *3: K20C2 engine

   Is there continuity?

   YES 

   The F-CAN_H wire and the F-CAN_L wire are OK.

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

   DTC	Operation for transmitting control unit
   U0100	Substitute a known-good PCM , then recheck. If DTC U0100 goes away and the PCM was substituted, replace the original PCM .
   U0122	Replace the VSA modulator-control unit .

   NO 

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