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Home >> Audi >> 2009 >> A4 Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1245 (Abs Guided Routine Testing) >> Pinpoint Tests >> Pinpoint Test CD: Valve Relay Supply Circuit Fault >> Normal Operation and Fault Conditions
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Normal Operation and Fault Conditions

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

The HCU solenoid valves require an operating voltage between 10 and 17 volts. 

The ABS module receives this voltage from the BJB. 

PPT CD ABS MODULE DTC FAULT SETTING CONDITIONS

DTC Description Fault Trigger Conditions
C1A77:11 Valve Relay Supply Circuit: Circuit Short to Ground This DTC sets when the solenoid valve voltage supplied to the ABS module is below a predetermined threshold.