Normal Operation
The brake booster solenoid is internal to the brake booster. During normal braking, the ABS module will apply a Pulse Width Modulated (PWM) voltage to the brake booster solenoid along circuit CCA22 (GY/YE). The ABS module will provide ground to the solenoid along circuit VCA22 (GN/BN). The ABS module constantly checks the integrity of the booster solenoid and circuits. If a booster solenoid fault is detected, the brake system will transition from brake-by-wire mode to conventional friction braking. Other DTCs for brake booster performance may set as a result of a brake booster solenoid circuit fault. The brake booster solenoid cannot be serviced separately from the brake booster. If a new brake booster solenoid is needed, a new brake booster must be installed.
| DTC Description | Fault Trigger Conditions |
|---|---|
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If the ABS module detects a short to ground on either circuit CCA22 (GY/YE) or VCA22 (GN/BN), this DTC will set. |
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If the ABS module detects a short to voltage on either circuit CCA22 (GY/YE) or VCA22 (GN/BN), this DTC will set. |
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If the ABS module detects an open or high resistance on either circuit CCA22 (GY/YE), VCA22 (GN/BN) or the solenoid, this DTC will set. |
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If the ABS module detects a short to ground, open or high resistance on either circuit CCA22 (GY/YE), VCA22 (GN/BN) or the solenoid, this DTC will set. |
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If the ABS module detects a short to ground, open or high resistance on either circuit CCA22 (GY/YE), VCA22 (GN/BN), the solenoid or if the ABS module is faulted internally, this DTC will set. |
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If the ABS module detects a short to ground on either circuit CCA22 (GY/YE), VCA22 (GN/BN), the solenoid or if the ABS module is faulted internally, this DTC will set. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Brake booster
- ABS module