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 harness between the sensors and ECUs can be detected in the ECU Data List function of the Techstream.

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

(b) Turn the engine switch on (IG). Follow the directions on the Techstream to display the Data List and select areas where momentary interruptions are monitored.

HINT
A momentary interruption (open circuit) cannot be detected for 3 seconds after the engine switch is turned on (IG) (initial check).





HINT
* If the ERROR display remains on, check the continuity between the ECU and the sensors, or between ECUs.
* The ERROR display 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 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.