Vehicle Stability Control System -- Check For Intermittent Problems |
| CHECK FOR INTERMITTENT PROBLEMS |
- HINT:
- 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.
Turn the ignition switch off.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the intelligent tester on.
Follow the directions on the intelligent tester to display the Data List and select areas where momentary interruptions should be monitored.
- HINT:
- A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned to ON (initial check).
- If Error is displayed, measure the resistance between the ECUs and sensors or between ECUs.
- Error remains displayed on the intelligent tester for 1 second after the harness signal changes from a momentary interruption (open circuit) to normal.
ABS/VSC/TRC Tester Display Measurement Item/Range Normal Condition Diagnostic Note FR Speed Open Front speed sensor RH open circuit detection / Error or Normal Normal - FL Speed Open Front speed sensor LH open circuit detection / Error or Normal Normal - RR Speed Open Rear speed sensor RH open circuit detection / Error or Normal Normal - RL Speed Open Rear speed sensor LH open circuit detection / Error or Normal Normal - EFI Communication Open EFI communication open circuit detection / Error or Normal Normal - Yaw Rate Open Yaw rate sensor open circuit detection / Error or Normal Normal - Deceleration Open Acceleration sensor open circuit detection / Error or Normal Normal - Steering Open Steering angle sensor open circuit detection / Error or Normal Normal - Master Cylinder Open Master cylinder pressure sensor open circuit detection / Error or Normal Normal - IG Voltage Value Decreased IG voltage value decrease detection / Error or Normal Normal - IG Voltage Value Increased IG voltage value increase detection / Error or Normal Normal - FR Speed Sensor Voltage Open Front speed sensor RH voltage open circuit detection / Error or Normal Normal - FL Speed Sensor Voltage Open Front speed sensor LH voltage open circuit detection / Error or Normal Normal - RR Speed Sensor Voltage Open Rear speed sensor RH voltage open circuit detection / Error or Normal Normal - RL Speed Sensor Voltage Open Rear speed sensor LH voltage open circuit detection / Error or Normal Normal - M/C Pressure Sensor Noise Master cylinder pressure sensor noise detection / Error or Normal Normal - Brake Pedal Switch Open Brake pedal load sensing switch open circuit detection / Error or Normal Normal - Yaw Rate Sensor Voltage Open Yaw rate sensor voltage open circuit detection / Error or Normal Normal - EFI Communication Invalid EFI communication invalid detection / Error or Normal Normal - While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors, or between ECUs.
- OK:
- Normal display does not change.
- HINT:
- If the display changes, the connector and/or 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.