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 by using the ECU data list function of an intelligent tester.
- Turn the ignition switch off and connect the intelligent tester to the DLC3.
- Turn the ignition switch on.
- Follow the prompts on the intelligent tester to display the DATA LIST and select areas where a 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).
- If the status remains on the ERROR display, check for continuity between the ECU and the sensors, or between ECUs.
- The ERROR display on the intelligent tester remains on for 1 second after the harness signal changes from a momentary interruption (open circuit) to normal condition.
DIAGNOSTIC NOTE AND MEASUREMENT ITEM/DISPLAY RANGEItem (Display) Measurement Item / Range (Display) Normal Condition Diagnostic Note FR SPD OPN FR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- FL SPD OPN FL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RR SPD OPN RR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RL SPD OPN RL speed sensor 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 ECUs.
OK: Display does not change.
HINT:
The connector and/or wire harness have a momentary interruption (open circuit) if the display changes. Repair or replace the connector and wire harness if either of them is faulty.