VEHICLE STABILITY CONTROL SYSTEM(for TMC Made) 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 to ON.

    4. Turn the tester on.

    5. 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 to ON (initial check).

      • If the Error display remains displayed, measure the resistance between the ECUs and 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 the normal condition.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Speed Open FR speed sensor open detection/Normal or Error

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

      		 -
      EFI Communication Open EFI communication open detection/Normal or Error

      Normal: Normal

      Error: Momentary interruption

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

      Error: Momentary interruption

      Normal: Normal

      		 -
      Deceleration Open Acceleration sensor open detection/Normal or Error

      Normal: Normal

      Error: Momentary interruption

      		 -
      Steering Open Steering angle sensor open detection/Normal or Error

      Normal: Normal

      Error: Momentary interruption

      		 -
      Master Cylinder Open Master cylinder pressure sensor open detection/Normal or Error

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

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

      Normal: Normal

      Error: Momentary interruption

      		 -

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

      Tech Tips

      If the display changes, the connector and/or the wire harness has caused a momentary interruption of the circuit. Repair or replace the connector and/or wire harness as one of them is faulty.