RX400h · Service Manual BRAKE

U0073/94

Diagnostic trouble codes

DESCRIPTION

The skid control ECU inputs the signals from the ECM, power steering (EPS) ECU, steering control (VGRS) ECU, steering angle sensor, and yaw rate and deceleration sensor via the CAN communication system.
DTC No.
 INF Code
 DTC Detecting Condition
 Trouble Area
U0073/94
 360
 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
U0123/62
 338
 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
U0124/95
 319
 When either of the following is detected:
  1. With the IG1 terminal voltage 9.5 V or more, data from the deceleration 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 deceleration sensor cannot be received occurs once or more within 5 seconds.
 CAN communication system
U0126/63
 350
 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
U0293/59
 152
 With the IG2 terminal voltage at 9.5 V or more for 2 seconds or more, communication with the HV control ECU remains invalid for 2 seconds or more.
 CAN communication system
U0293/59
 153
 With the G2 terminal voltage at 9.5 V or more for 2 seconds or more, communication with the HV control ECU that occurs once or more within 5 seconds changes from being valid communication to being invalid communication 10 times or more within 1 minute.
 CAN communication system
U0293/59
 155
 With the IG2 terminal voltage at 9.5 V or more for 2 seconds or more, abnormal regenerative braking torque value or braking request torque value is received for 2 seconds or more.
 CAN communication system

WIRING DIAGRAM

C112006E02

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).

    ABS / VSC / TRAC: 
    Item
    (Display)
    		 Measurement Item /
    Range (Display)
    		 Normal Condition
    HV COM OPN
    		 HV communication open detection /
    ERROR or NORMAL
    		 ERROR: Momentary interruption
    NORMAL: Normal
    STEERING OPN
    		 Steering sensor open detection /
    ERROR or NORMAL
    		 ERROR: Momentary interruption
    NORMAL: Normal
    YAW RATE OPN
    		 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, ECB and CAN communication) (Click here).

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


    Result:
    Condition
    		 Proceed To
    DTC is not output
    		 A
    DTC is output
    		 B



B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A

REPAIR CAN COMMUNICATION SYSTEM

3. REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector (Click here).

  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


Go to step 3

4. RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Turn the ignition switch on.

  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 (Click here).

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

    Result:
    Condition
    		 Proceed To
    DTC for the CAN communication system is output
    		 A
    No DTC is output (ABS, VSC and ECB DTCs are output)
    		 B
    No DTC is output (No ABS, VSC and ECB DTCs are output)
    		 C

    HINT:
    The CAN communication system must be normal when repairing the sensor DTCs (for ABS, VSC and EBC).



 B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE

C
END
A

REPAIR CAN COMMUNICATION SYSTEM


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