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Home >> Chevrolet >> 2001 >> Impala Base, 3.8 K >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Anti-Lock Brake System With Traction Control System - BOSCH 5.3) >> Diagnostic Tests >> DTC C0121: Valve Relay Circuit Malfunction >> Circuit Description

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.

Solenoid valve relay supplies power to solenoid valve coils in EBCM. Solenoid valve relay, located in EBCM, is activated whenever ignition is on and no faults are present. Solenoid valve relay remains engaged until ignition is turned off or a failure is detected.

DTC sets anytime solenoid valve relay is commanded on and EBCM does not see battery voltage at solenoid valves or anytime EBCM commands solenoid valve relay off and battery voltage is still present at solenoid valves.

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