2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 872

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 872

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.

2. Test for less than 1 ohm between the ground circuits listed below and ground.

* Terminal 13

* Terminal 38

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground.

* Terminal 1

* Terminal 25

瀚慖f the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance.

4. If all circuits test normal, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming

C012E

DTC C012E or C12FE

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 Descriptors

DTC C012E 00

- Hydraulic Brake Boost Pressure Loss

DTC C12FE 00

- ABS Pump Pressure Loss

Circuit/System Description

The electronic brake control module (EBCM) uses input from the boost pressure sensor for more accurate control during brake and vehicle stability

enhancement system event. The boost pressure sensor is internal to the brake pressure modulator valve. The boost control function will keep

operating amongst conditions that cause the boost pressure to be limited to less than commanded. The boost control continues to apply until the

boost pressure available is no greater than the master cylinder pressure the driver is applying.

Conditions for Running the DTC

* Engine Running

* Ignition voltage is greater than 10 volts.

* Transmission in Park

* Brake pedal was applied.

Conditions for Setting the DTC

* Boost pressure command greater than boost pressure +1500 kPa (217 psi) for 250 ms.

* Master cylinder pressure greater than boost pressure -200 kPa (29 psi) for 250 ms.