Anti-Lock Brake 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

Anti-Lock Brake 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.


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

  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.Anti-Lock Brake 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 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 the normal condition.

    Tester Display
    		Measurement Item /
    Range
    		Normal Condition
    		Diagnostic Note
    FR Speed Open
    		FR speed sensor open detection / ERROR or NORMAL
    		NORMAL
    		-
    FL Speed Open
    		FL speed sensor open detection / ERROR or NORMAL
    		NORMAL
    		-
    RR Speed Open
    		RR speed sensor open detection / ERROR or NORMAL
    		NORMAL
    		-
    RL Speed Open
    		RL speed sensor open detection / ERROR or 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.

    OK:
    NORMAL display does not change.
    HINT:
    The connector and/or wire harness have a momentary interruption (open circuit) if the display changes. Repair or replace the connector and wire harness if either of them is faulty.