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.
The vacuum pressure sensor produces 2 signals used by the ABS module to check the integrity of the vacuum lines, hoses and fittings, and to measure the performance of the brake vacuum pump and brake booster. The ABS module provides a 5-volt reference voltage to the vacuum pressure sensor along circuit LCA37 (YE/OG). Vacuum pressure sensor signal A is provided to the ABS module along circuit VCA38 (BN/VT). Vacuum pressure sensor signal B is provided to the ABS module along circuit VCA39 (BU/GN). The ABS module provides a signal return to the vacuum pressure sensor along circuit RCA37 (WH/BU).
DTC FAULT TRIGGER CONDITIONS CHART
| DTC Description | Fault Trigger Conditions |
|---|---|
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If vacuum pressure sensor circuit VCA38 (BN/VT) is shorted to ground, shorted to voltage or has high resistance, this DTC will set. A short to ground or a short to voltage on circuit LCA37 (YE/OG), or an open or short to voltage on circuit RCA37 (WH/BU) could cause both DTCs C101A:1C and C101B:1C to set. |
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If the 2 vacuum pressure signals produced by the vacuum pressure sensor do not match, this DTC will set. This DTC can also set as a result of DTCs C101A:1C, 64 and C101B:1C, or due to high resistance or an open on circuit LCA37 (YE/OG). |
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If the vacuum pressure sensor signal A, circuit VCA38 (BN/VT) is shorted to vacuum pressure sensor signal B, circuit VCA39 (BU/GN), this DTC will set. |
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If vacuum pressure sensor circuit VCA39 (BU/GN) is shorted to ground, shorted to voltage or has high resistance, this DTC will set. A short to ground or a short to voltage on circuit LCA37 (YE/OG), or an open or short to voltage on circuit RCA37 (WH/BU) could cause both DTCs C101A:1C and C101B:1C to set. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Vacuum pressure sensor
- ABS module