Check For Intermittent Problems
WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
- 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 the hand-held tester.
- Turn the ignition switch off and connect the hand-held tester to the DLC3.
- Turn the ignition switch on. Follow the on-screen directions on the hand-held tester 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).
ITEM, MEASUREMENT ITEM/RANGE (DISPLAY) AND NORMAL CONDITIONItem Measurement Item/Range (Display) Normal Condition Diagnostic Note SPD SEN FR Speed sensor open detection (FR)/OPN DET or NORMAL OPN DET: Momentary interruption NORMAL: Normal - SPD SEN FL Speed sensor open detection (FL)/OPN DET or NORMAL OPN DET: Momentary interruption NORMAL: Normal - SPD SEN RR Speed sensor open detection (RR)/OPN DET or NORMAL OPN DET: Momentary interruption NORMAL: Normal - SPD SEN RL Speed sensor open detection (RL)/OPN DET or NORMAL OPN DET: Momentary interruption NORMAL: Normal - HINT:
- If the hand-held tester status remains on, check the continuity between the ECU and the sensors, or between ECUs.
- The OPN DET display on the hand-held tester 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:
OPN DET 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.