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 in the ECU data list function of the intelligent tester.
- Turn the engine switch off and connect the intelligent tester to the DLC3.
- Turn the engine switch on (IG). Follow the directions on the intelligent 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 engine switch is turned on (IG) (initial check).
ABS / VSC:
ABS / VSC - ITEM (DISPLAY) MEASUREMENT ITEM / RANGE (DISPLAY) AND NORMAL CONDITION CHARTItem (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- EFI COM OPN EFI communication open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- YAW RATE OPN Yaw rate sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- DECELERAT OPN Acceleration sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- STEERING OPN Steering angle sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- M/C OPN Master cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- M/C2 OPN Master cylinder pressure sensor 2 open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- STROKE OPN Stroke sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- FR W/C OPN FR wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- FL W/C OPN FL wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RR W/C OPN RR wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RL W/C OPN RL wheel cylinder pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- ACC OPEN Accumulator pressure sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- HINT:
- If the status remains on (ERROR displayed), check the 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 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:
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 connector and/or wire harness as one of them is faulty.