Vehicle Stability Control System Check For Intermittent Problems

Brake. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Brake Control. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. CHECK FOR INTERMITTENT PROBLEMS

Vehicle Stability Control System -- Check For Intermittent Problems



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 by using the ECU Data List function of the intelligent tester.

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

  2. Turn the ignition switch to ON.



    3. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System.Vehicle Stability Control System Check For Intermittent Problems

  3. Follow the prompts on the intelligent tester to display the Data List and select areas where a momentary interruption should be monitored.

    HINT:
    1. A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned to ON (initial check).
    2. If the status remains on the ERROR display, check for continuity between the ECU and the sensors, or between ECUs.
    3. The ERROR display on the intelligent tester remains on for 1 second after the harness signal changes from a momentary interruption (open circuit) to normal condition.

    ABS/VSC/TRC:
    Tester Display
    		Measurement Item/Range
    		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
    		-
    EFI Communication Open
    		EFI communication 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
    		-


    4. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  4. While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs. If the display changes, the connector and/or wire harness is in momentary interruption (open circuit). Repair or replace the connector and/or wire harness, as one of them is faulty.