Check For Intermittent Problems

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

1. CHECK FOR INTERMITTENT PROBLEMS

HINT
A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the ECU Data List function of the Techstream.

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Follow the directions on the Techstream to display the Data List and select areas where momentary interruptions 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 Error remains displayed, check for continuity between the ECUs and the sensors, or between ECUs.
* Error will remain displayed on the Techstream for 1 second after the harness signal changes from momentary interruption (open circuit) to normal.

ABS/VSC/TRAC





(f) While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors, or between ECUs.





OK:

Normal is displayed.

HINT
If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.