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 List function of Techstream.
- Turn the ignition switch off and connect Techstream to the DLC3.
- Turn the ignition switch on. Follow the directions on Techstream to display the Data List and select areas where momentary interruption should be monitored.
HINT:
A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned on (initial check).
ABS / VSC / TRAC:
ABS / VSC / TRAC INTERMITTENT PROBLEMS REFERENCETester 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- Yaw Rate Open Yaw rate sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- Deceleration Open Deceleration 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- Master Cylinder 2 Open Master Cylinder pressure sensor 2 open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- Stroke Open Stroke sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- FR Wheel Cylinder Open FR wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- FL Wheel Cylinder Open FL wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RR Wheel Cylinder Open RR wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RL Wheel Cylinder Open RL wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- Accumulator Open Accumulator pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- HV Communication Open HV communication open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- HINT:
- If the status remains on (ERROR displayed), check the continuity between the ECU and the sensors, or between ECUs.
- The ERROR display on Techstream remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.
- While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.
Result:
ERROR display does not change.
HINT:
The connector and/or wire harness will be in momentary interruption (open circuit) if the display changes. Repair or replace connector and/or wire harness as one of them is faulty.