Circuit Description

The motor relay A and the motor relay B are controlled by the M-ASTC-ECU. If the brake fluid pressure in the Hydraulic Brake Booster (HBB) becomes low, the M-ASTC-ECU outputs the motor relay actuating signal to the motor relay A and the motor relay B and then the pump motor operates. The M-ASTC-ECU monitors the pump motor (at terminal 25). See Fig 1 and Fig 2 .

Fig 1: Identifying Motor Relay Circuit

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Locating Motor Relay Circuit Connectors

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.