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 ABS module receives brake booster vacuum information directly from the brake booster vacuum sensor. When the vacuum in the booster reaches a predetermined threshold, the ABS module grounds the vacuum pump relay. The relay stays activated and the pump continues to run until the vacuum in the brake booster reaches another predetermined level. Once this second level is reached the ABS module deactivates the relay.

The vacuum pump runs continuously if there is a short to voltage on the circuit between the vacuum pump and the vacuum pump relay, a short to ground on the circuit between the ABS module and the vacuum pump relay, an internal short in the vacuum pump relay or a leak in the brake booster or the vacuum hose between the vacuum pump and the brake booster.

PPT VA ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
C101C:14	Brake Vacuum Pump: Circuit Short to Ground or Open	This DTC sets if the ABS module detects a short to ground or an open on the brake vacuum pump relay control circuit. After the cause of this DTC is repaired, the ignition must be cycled before this DTC can be cleared from the ABS module.
C101C:67	Brake Vacuum Pump: Signal Incorrect After Event	The ABS module carries out a pump operation check by first reducing the vacuum in the brake booster to -10 kPa (-3 inHg), waiting 5 seconds and then increasing the vacuum in the brake booster to -65 kPa (-19 inHg). If the vacuum in the booster does not reach -65 kPa (-19 inHg) then the ABS module sets a DTC.