Pinpoint Test AE : C1B14:11, C1B14:12, U3000:47: Notes

Diagnostic Overview

C1B14:11, C1B14:12, U3000:47

Refer to Vehicle Dynamic Systems for schematic and connector information.

Normal Operation and Fault Conditions

The brake booster vacuum sensor measures the amount of vacuum in the brake booster as compared to the atmosphere. This information is sent to the ABS module and is used to determine if additional braking assistance is required. A vacuum leak, a circuit failure in the sensor wiring, a brake booster with a mechanical failure or an internal failure of the vacuum sensor or ABS module results in a DTC being set in the ABS module. REFER to Anti-Lock Brake System (ABS) and Stability Control , Brake Booster Vacuum Sensor.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
C1B14:11	Sensor Supply Voltage A: Circuit Short to Ground	The ABS module supplies the brake booster vacuum sensor with a 5 volt operating voltage. The module monitors the voltage supply as it is generated and then again as it is sent out to the sensor. If the voltage varies by more than 100 mV for less than 1 second, this DTC is set in the ABS module. This failure can be caused by a short to ground, a damaged ABS module or a fluctuating voltage supply to the ABS module.
C1B14:12	Sensor Supply Voltage A: Circuit Short to Battery	The ABS module supplies the brake booster vacuum sensor with a 5 volt operating voltage. The module monitors the voltage supply as it is generated and then again as it is sent out to the sensor. If the voltage varies by more than 100 mV for less than 1 second, this DTC is set in the ABS module. This failure can be caused by a short to voltage, a damaged ABS module or a fluctuating voltage supply to the ABS module.
U3000:47	Control Module: Watchdog Safety Feature	The ABS module continually tests its own microprocessor as long as the ignition is ON. If the microprocessor fails this test, this DTC is set. This failure can be caused by high frequency interference, fluctuations in the voltage supply to the ABS module or an internal failure of the ABS module.