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 in the ECU data monitor function of Techstream.
- Turn the ignition switch off and connect Techstream to the DLC3.
- Turn the ignition switch to ON. Follow the on-screen directions on Techstream to display the Data List and select areas where momentary interruption should be monitored.
ABS/VSC/TRAC
DATA LIST REFERENCETester Display Measurement Item/Range Normal Condition Diagnostic Note FR Speed Open Front speed sensor RH open detection/OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- FL Speed Open Front speed sensor LH open detection/OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- RR Speed Open Rear speed sensor RH open detection/OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- RL Speed Open Rear speed sensor LH open detection/OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- HINT:
- A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned to ON (initial check).
- If OPN DET is displayed on Techstream, check the wire harness and connectors between the ECU and sensors.
- The OPN DET display on Techstream remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.
- While observing the combination meter display, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.
Result:
OPN DET display does not change.
HINT:
The connector and/or wire harness are in momentary interruption (open circuit) if the display changes. Repair or replace the connector and/or wire harness as one of them is faulty.