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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2450 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnosis And Testing >> Anti-Lock Control - Hybrid >> Pinpoint Tests >> Pinpoint Test T: DTCs C101C:01 and 71 >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

When the combustion engine is not running, the vacuum pump is utilized to maintain a vacuum inside the brake booster. The ABS module controls the vacuum pump through the use of a mechanical relay located in the Battery Junction Box (BJB) and a solid state relay located in the auxiliary relay box. The mechanical relay provides power to the solid state relay. The solid state relay provides power to the vacuum pump motor. When the ignition is in the RUN position, the ABS module will close the mechanical relay. After the vehicle is started (the ready indicator is illuminated) the ABS module will activate the solid state relay as necessary to maintain a vacuum inside the brake booster.

When the ignition switch is in the RUN position, the ABS module will send an ground signal from C155-35, along circuit CCB30 (GY/BK) to the mechanical relay. The mechanical relay will close, applying battery voltage from BJB  fuse 4 (40A) to the solid state relay along circuit CBB04 (VT). When it is necessary to build vacuum in the brake booster, the ABS module will send a ground signal from C155-15, along circuit CCB30 (GY/VT) to the solid state relay. The solid state relay will then apply the battery voltage from circuit CBB04 (VT) to the vacuum pump along circuit CCB29 (WH/GN) and to the ABS module on circuit CB101 (BU). The ABS module monitors the voltage available on circuit CB101 (BU). If a relay circuit or vacuum pump circuit is shorted to ground, shorted to voltage, open or has high resistance, a DTC will set.

The logic internal to the solid state relay provides circuit protection for the vacuum pump circuit CCB29 (WH/GN). If a short to ground on circuit CCB29 (WH/GN) is detected, the relay will stop applying power to circuit CCB29 (WH/GN) until the short has been repaired.

If a vacuum pump DTC is set, the red BRAKE indicator will illuminate and the combustion engine will run to supply vacuum to the brake booster.

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