Check For Intermittent Problems

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: CHECK FOR INTERMITTENT PROBLEMS

CHECK FOR INTERMITTENT PROBLEMS

1. 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 using the ECU Data List function of Techstream.

(a) Turn the power switch off and connect Techstream to the DLC3.





(b) Turn the power switch on (IG). Follow the directions on Techstream 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 power switch is turned on (IG) (initial check).
- If the status remains on (ERROR displayed), check the continuity between the ECU and the sensors, or between the ECUs.
- The ERROR display on Techstream remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.














(c) While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between the 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 the connector and/or wire harness as one of them is faulty.