2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 876

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 876

1. Ignition ON, perform the ABS Motor test with a scan tool. You should hear or feel the ABS pump motor turn ON and OFF.

瀚慖f the pump motor does not turn ON and OFF, refer to Circuit/System Testing.

Note: To ensure the complete brake modulator and high pressure accumulator pressure relief procedure is allowed to occur, the brake

controller must see one brake pedal apply with the engine running followed by a proper shutdown without applying the brake pedal.

2. Transmission in PARK, engine running, apply and release the brake pedal.

Note: The ignition must transition to the OFF position without pausing at ACCESSORY and without applying the brake pedal. This ensures

that the brake modulator and high pressure accumulator relief occurs. This process will take approximately 1-2 minutes.

3. Ignition OFF, key removed from the ignition, wait 2 minutes.

4. Ignition ON, observe the scan tool EBCM, Accum. Pressure Sensor parameter. The Accum. Pressure Sensor parameter should be greater than

18,000 kPa (2,600 psi) in less than 30 seconds.

瀚慖f less than 18,000 kPa (2,600 psi) or it takes longer than 30 seconds to build pressure, refer to Brake Hydraulic and Assist System

Diagnosis (Two-mode Hybrid) (See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Component Tests and

General Diagnostics/Brake Hydraulic and Assist System Diagnosis (Two-mode Hybrid)).

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the K17 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 25

* Terminal 1

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the

B+ circuit fuse is open, replace the Q5 brake pressure modulator valve assembly.

4. If all circuits test normal, replace the Q5 brake pressure modulator valve assembly and verify DTC does not reset. If the DTC resets, replace

the K17 EBCM.

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Hydraulic

Control Assembly - Antilock Brakes/Service and Repair)

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

C12E1

DTC C0899 or C12E1

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 C0899 00

- Device Voltage Low - EBCM 12V