Circuit Description
WARNING: This page is about a different car, the 2001 Pontiac Grand Prix, 2001 Pontiac Firebird, 2001 Oldsmobile Intrigue, and 2001 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
Pump motor is an integral part of BPMV, while pump motor relay is integral to EBCM. Pump motor relay is not engaged during normal system operation. When ABS or TCS operation is required, EBCM activates pump motor relay and battery power is provided to the pump motor.
DTC sets when pump motor voltage is not present 60 milliseconds after activation of pump motor relay, pump motor voltage is present for more than 2.5 seconds with no activation of pump motor relay or pump motor voltage is not present for 40 milliseconds after pump motor relay is commanded off.