VEHICLE STABILITY CONTROL SYSTEM CHECK FOR INTERMITTENT PROBLEMS


  1. CHECK FOR INTERMITTENT PROBLEMS

    Tech Tips

    A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the ECU Data List function of the intelligent tester.


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch on (IG).

    4. Turn the intelligent tester on.

    5. A017C3YE44

      Follow the directions on the intelligent tester to display the Data List and select areas where momentary interruptions should be monitored.

      Tech Tips


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

      • If the Error display remains displayed, check for continuity between the ECUs and the sensors, or between ECUs.

      • The Error display on the intelligent tester will remain displayed for 1 second after the harness signal changes from 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 Acceleration 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

      		 -
      IG Voltage Value Decreased IG voltage value decrease detection / Error or Normal

      Error: Decrease

      Normal: Normal

      		 -
      IG Voltage Value Increased IG voltage value increase detection / Error or Normal

      Error: Increase

      Normal: Normal

      		 -
      FR Speed Sensor Voltage Open FR speed sensor voltage open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      FL Speed Sensor Voltage Open FL speed sensor voltage open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      RR Speed Sensor Voltage Open RR speed sensor voltage open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      RL Speed Sensor Voltage Open RL speed sensor voltage open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      M/C Pressure Sensor Noise Master cylinder pressure sensor noise detection / Error or Normal

      Error: Malfunction

      Normal: Normal

      		 -
      Brake Pedal Switch Open Brake pedal load sensing switch open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Yaw Rate Sensor Voltage Open Yaw rate sensor voltage open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      EFI Communication Invalid EFI communication invalid detection / Error or Normal

      Error: Invalid

      Normal: Normal

      		 -
    6. A017BD1

      While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors, or between ECUs.

      Tech Tips

      The connector and/or wire harness has a momentary interruption (open circuit) if the display changes. Repair or replace the connectors and/or wire harnesses as one of them is faulty.