DTC    U0073/94    Control Module Communication Bus Off

DTC    U0100/65    Lost Communication with ECM / PCM

DTC    U0123/62    Lost Communication with Yaw Rate Sensor Module

DTC    U0124/95    Lost Communication with Lateral Acceleration Sensor Module

DTC    U0126/63    Lost Communication with Steering Angle Sensor Module

for Preparation Click here


DESCRIPTION

The skid control ECU inputs the signals from the ECM, steering angle sensor, and yaw rate and acceleration sensor via CAN communication system.

DTC No.
DTC Detecting Condition
Trouble Area
U0073/94
When either of the following is detected:
  1. After the output of data from the skid control ECU is completed, the sending continues for 5 seconds or more.
  2. The condition that bus OFF state occurs once or more within 100 ms occurs 10 times in succession. (Sent signals cannot be received.)
CAN communication system
U0100/65
When either of the following is detected:
  1. With the IG1 terminal voltage 10 V or more and the vehicle speed 9 mph (15 km/h) or more, data cannot be sent to the ECM.
  2. With the IG1 terminal voltage 10 V or more and the vehicle speed 9 mph (15 km/h) or more, either of the following occurs 10 times in succession.
  1. The condition that data cannot be sent to the ECM occurs once or more within 5 seconds.
  2. The condition that data from the ECM cannot be received occurs once or more within 5 seconds.
Can communication system
(Skid control ECU to ECM)
U0123/62
When either of the following is detected:
  1. With the IG1 terminal voltage 10 V or more, data from the yaw rate sensor cannot be received for 1 second or more.
  2. With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession.
  1. The condition that data from the yaw rate sensor cannot be received occurs once or more within 5 seconds.
CAN communication system
(Skid control ECU to yaw rate and acceleration sensor)
U0124/95
When either of the following is detected:
  1. With the IG1 terminal voltage 9.5 V or more, data from the acceleration sensor cannot be received for 1 second or more.
  2. With the IG1 terminal voltage 9.5 V or more, the following occurs 10 times in succession.
  1. The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.
CAN communication system
(Skid control ECU to yaw rate and acceleration sensor)
U0126/63
When either of the following is detected:
  1. With the IG1 terminal voltage 10 V or more, data from the steering sensor cannot be received for 1 second or more.
  2. With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession.
  1. The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.
CAN communication system
(Skid control ECU to steering angle sensor)

WIRING DIAGRAM


C109393E01


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (Click here).

    DATA LIST: ABS/VSC/TR(A)C 
    Item (Display)
    		Measurement Item / Range (Display)
    		Normal Condition
    EFI Communication Open
    		EFI communication open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    Steering Open
    		Steering sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    Yaw Rate Open
    		Yaw rate sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal

    OK:
    There are no momentary interruptions.

    HINT:
    Perform the above inspection before removing the sensor and connector.



NG
Go to step 3
OK


2.RECONFIRM DTC

  1. Record the output DTCs (for ABS, VSC, and CAN communication) (Click here for ABS, VSC or Click here for CAN).

    HINT:
    If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS and VSC) after the CAN communication system returns to normal.


    Result:

    Condition
    		Proceed To
    DTC is not output
    		A
    DTC is output
    		B (Click here for ABS, VSC or Click here for CAN)



B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A

REPAIR CAN COMMUNICATION SYSTEM 

3.REPAIR OR REPLACE HARNESS AND CONNECTOR

  1. Repair or replace the harness and connector.

  1. Check for any momentary interruption between the skid control ECU and each sensor or ECM (Click here).

  1. Check that there is no momentary interruption.


NEXT


4.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Start the engine.

  1. Drive the vehicle and turn the steering wheel to the right and left at a speed of 9 mph (15 km/h) or more.

  1. Check that no CAN communication system DTC is output.

  1. If ABS and VSC DTCs are output, record them.

    Result:

    Condition
    		Proceed To
    DTC output for the CAN communication system
    		A
    No DTC is output (ABS and VSC DTCs are output)
    		B (Click here)
    No DTC is output (No ABS and VSC DTCs are output)
    		C

    HINT:
    The CAN communication system must be normal when repairing each sensor DTC (for ABS and VSC).



B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE

C
END
A

REPAIR CAN COMMUNICATION SYSTEM