Normal Operation
The brake pedal feel simulator cut-off solenoid valve and brake pedal feel simulator cut-off pressure sensor are located within the brake pedal feel simulator, which is attached to the brake pedal assembly. The ABS module will apply a Pulse-Width Modulation (PWM) ground signal to the brake pedal feel simulator cut-off solenoid valve to increase the resistance felt when the driver applies the brake pedal. The ABS module uses input from the brake pedal feel simulator cut-off valve pressure sensor to verify that the brake pedal feel simulator cut-off solenoid valve is functioning properly. If the ABS module detects a fault with a brake system component that would hinder brake-by-wire operation, the module will remove power from the brake pedal feel simulator cut-off valve solenoid, relieving simulator fluid pressure.
The ABS module provides power to the brake pedal feel simulator cut-off valve solenoid along circuit CCB31 (BN/VT). The ABS module provides a PWM ground signal to the solenoid along circuit CCB32 (BU/OG). If either circuit is shorted to ground, shorted to voltage or has high resistance, a DTC will set.
The ABS module provides the brake pedal feel simulator cut-off pressure sensor a 5-volt reference voltage along circuit LCA16 (GN). The brake pedal feel simulator provides a signal voltage proportional to the fluid pressure in the brake pedal feel simulator cut-off device along circuit VCA13 (YE/BU). The ABS module provides a signal return to brake pedal feel simulator cut-off pressure sensor along circuit RCA16 (BU/BN).
Both the brake pedal feel simulator cut-off solenoid valve and brake pedal feel simulator cut-off pressure sensor are internal to the brake pedal feel simulator and cannot be serviced separately. If a new brake pedal feel simulator is needed, a new brake pedal assembly must be installed.
| DTC Description | Fault Trigger Conditions |
|---|---|
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If the brake pedal feel simulator cut-off pressure sensor circuits are intermittently shorted to ground, shorted to voltage or have high resistance, this DTC will set. |
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If the brake pedal feel simulator cut-off pressure sensor circuits are shorted to ground, shorted to voltage or have high resistance, this DTC will set. |
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If the test signal produced by the brake pedal feel simulator cut-off pressure sensor is incorrect, this DTC will set. |
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If the brake pedal feel simulator cut-off valve solenoid circuits are shorted to ground, shorted to power or have high resistance or if the brake pedal feel simulator cut-off valve solenoid is shorted internally, this DTC will set. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Brake pedal feel simulator cut-off pressure sensor
- Brake pedal feel simulator valve solenoid
- ABS module