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 using the ECU Data List function of Techstream.
- Turn the power switch off and connect Techstream to the DLC3.
- Turn the power switch on (IG). 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 power switch is turned on (IG) (initial check).
- If the status remains on (ERROR displayed), check the continuity between the ECU and the sensors, or between the ECUs.
- The ERROR display on Techstream remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.
ABS / VSC / TRAC:
SPEED SENSOR OPEN RANGE 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 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 - 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 - Stroke 2 Open Stroke sensor 2 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 - - While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between the 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 the connector and/or wire harness as one of them is faulty.