ELECTRONICALLY CONTROLLED BRAKE SYSTEM > CHECK FOR INTERMITTENT PROBLEMS

for Preparation Click here



CHECK FOR INTERMITTENT PROBLEMS

HINT:
A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected in the ECU data list function of the intelligent tester.



    C104146E01

  1. Turn the ignition switch off and connect the intelligent tester to the DLC3.



    2. F047125E01

  2. Turn the ignition switch on. Follow the directions on the intelligent tester to display the "Data List" and select areas where momentary interruption should be monitored.

    HINT:
    A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned on (initial check).


    ABS / VSC / TRAC: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    		Diagnostic Note
    FR Speed Open
    		FR speed sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    FL Speed Open
    		FL speed sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    RR Speed Open
    		RR speed sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    RL Speed Open
    		RL speed 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
    		-
    Deceleration Open
    		Deceleration sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    Steering Open
    		Steering angle sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    Master Cylinder Open
    		Master Cylinder pressure sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    Master Cylinder2 Open
    		Master Cylinder pressure sensor 2 open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    Stroke Open
    		Stroke sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    FR Wheel Cylinder Open
    		FR wheel cylinder pressure sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    FL Wheel Cylinder Open
    		FL wheel cylinder pressure sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    RR Wheel Cylinder Open
    		RR wheel cylinder pressure sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    RL Wheel Cylinder Open
    		RL wheel cylinder pressure sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    Accumulator Open
    		Accumulator pressure sensor open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-
    HV Communication Open
    		HV communication open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal
    		-

    HINT:
    1. If the status remains on (ERROR displayed), check the continuity between the ECU and the sensors, or between ECUs.
    2. The ERROR display on the intelligent tester remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.



    3. F047126

  3. While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.

    Result:
    ERROR display does not change.

    HINT:
    The connector and/or wire harness will be in momentary interruption (open circuit) if the display changes. Repair or replace connector and/or wire harness as one of them is faulty.