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 harness between the sensors and ECUs can be detected using the Data List function of the GTS.


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Follow the directions on the GTS to display the Data List and select areas where momentary interruption 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 Error remains displayed for one of the items on the GTS, check for continuity between the ECU and the item for which Error is displayed.

      • If a momentary interruption occurs and Error is displayed on the GTS, Error will remain displayed on the GTS for 1 second after the circuit returns to normal.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Speed Open Front speed sensor RH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      FL Speed Open Front speed sensor LH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      RR Speed Open Rear speed sensor RH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      RL Speed Open Rear speed sensor LH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      EFI Communication Open ECM 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

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

      Error: Momentary interruption

      Normal: Normal

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

      Error: Momentary interruption

      Normal: Normal

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

      Error: Momentary interruption

      Normal: Normal

      		 -
      RL Speed Sensor Voltage Open Rear speed sensor LH 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 ECM communication invalid detection Error or Normal

      Error: Invalid

      Normal: Normal

      		 -
      Master Cylinder Pressure Sensor Power Supply Open Master cylinder pressure sensor power supply voltage status Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Solenoid Power Supply Open Solenoid power supply voltage status Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Motor Power Supply Open Motor power supply voltage status Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Stop Switch Open Momentary interruption (open circuit) status in the wire harness between the skid control ECU (brake actuator assembly) and the stop light switch assembly Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -

    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, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.