2010 Cadillac Truck SRX FWD V6-3.0L Page 757

2010 Cadillac Truck SRX FWD V6-3.0L Page 757

replace the K17 Electronic Brake Control Module (EBCM).

7. If all circuits test normal, replace the B119 Multi-axis Acceleration Sensor and verify the DTC does not reset.

瀚慖f the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests)

* Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes

/ Traction Control Systems/Yaw Rate Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM or Multi-axis Acceleration Sensor

replacement, programming and setup

C027B

DTC C027B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC C027B 00

- Brake Booster Electric Vacuum Pump Malfunction

Diagnostic Fault Information

Circuit/System Description

The brake booster vacuum sensor measures the vacuum in the brake booster assembly. The electronic brake control module (EBCM) supplies a 5 V

reference and a low reference circuit to the brake booster vacuum sensor. The vacuum sensor supplies a voltage signal in relation to the pressure in

the brake booster to the EBCM. When the vacuum within the system drops, the EBCM turns ON the vacuum pump by providing ground to the

vacuum pump relay. The relay activates and supplies voltage to the brake booster pump motor.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

The EBCM detects a vacuum leak.

Action Taken When the DTC Sets

The brake warning indicator turns ON.