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 monitored using the ECU data monitor function of the Techstream.
- Turn the engine switch off.
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
- Select areas where momentary interruption should be monitored.ABS/VSC/TRAC
Tester Display Measurement Item/Range Normal Condition Diagnostic Note FR Speed Open Front speed sensor RH open detection/Error or Normal Error: Momentary interruption
Normal: Normal- FL Speed Open Front speed sensor LH open detection/Error or Normal Error: Momentary interruption
Normal: Normal- RR Speed Open Rear speed sensor RH open detection/Error or Normal Error: Momentary interruption
Normal: Normal- RL Speed Open Rear speed sensor LH open detection/Error or Normal Error: Momentary interruption
Normal: Normal- EFI Communication Open ECM communication 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- HINT:
- A momentary interruption (open circuit) cannot be detected for 3 seconds after the engine switch is turned on (IG) (initial check).
- If the Error display remains on, check the continuity between the ECU and the sensors, or between ECUs.
- The Error display 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. If the display changes, the connector and/or wire harness is in momentary interruption (open circuit). Repair or replace the connector and/or wire harness, as one of them is faulty.