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 Techstream.
- Turn the power switch off.
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Follow the directions on the Techstream 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 power switch is turned on (IG) (initial check).
- If the ERROR display remains displayed, check for continuity between the ECUs and the sensors, or between ECUs.
- The ERROR display on the Techstream will remain displayed for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.
ABS / VSC / TRAC:
DATA LIST AND ACTIVE TEST - ABS / VSC / TRACTester 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 - 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 Hybrid vehicle communication open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal - - While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors, or between ECUs.
OK: NORMAL display appears.
HINT:
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.