DTC 85

CIRCUIT DIAGRAM





INSPECTION PROCEDURE

CIRCUIT DESCRIPTION:
The proportioning valve contains a normally open differential switch. This switch closes when there is a loss of pressure in the front brakes hydraulic circuit.
When differential switch closes, it grounds CKT "R/B" and "V/W" (or "V/G"); turning on the "BRAKE" warning light and it signals the Electronic Brake Control Module (EBCM) to shut down the Antilock Brake System (ABS).
The function of the diode between CKT "R/B" and "VOW" is to prevent a grounded signal to the EBCM when either the parking brake is applied or the brake fluid level switch is closed, thus preventing a false DTC 85.

FAILURE CONDITION:
DTC 85 can be set anytime. If the EBCM detects a loss of front base brake pressure, a faulty differential switch, or a short in the "BRAKE" warning light CKT "R/B", a malfunction exists.