C0044:49

Diagnostic Routine C

Diagnostic Overview

C0044:28, C0044:49, C0044:64

Refer to Wiring Diagram Set 42 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The ABS (Anti-Lock Brake System) module uses internal pressure sensors to determine correct system operation by monitoring internal HCU (Hydraulic Control Unit) hydraulic pressures. The pressure sensors are internal to the HCU (Hydraulic Control Unit) and cannot be serviced separately. Unintentional brake fluid pressure present when the ABS (Anti-Lock Brake System) module is expecting no brake fluid pressure can set this fault.

DTC Fault Trigger Conditions






Pinpoint Test

1. CHECK THE BRAKE PEDAL AND BRACKET

1. Inspect the brake pedal position switch and brake pedal assembly. Verify there is no brake pedal pressure unintentionally applied due to incorrect brake pedal position switch or brake pedal installation.

Are the brake pedal position switch and brake pedal OK?






2. CHECK FOR DTCs (Diagnostic Trouble Codes) C0044:28, C0044:49 AND C0044:64 TO RETURN

1. Ignition ON.

2. Using a scan tool, clear all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

3. Test drive the vehicle at speeds greater than 32 km/h (19.9 mph).

4. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.

Are DTCs (Diagnostic Trouble Codes) C0044:28, C0044:49 and/or C0044:64 present?






3. CHECK FOR CORRECT ABS (Anti-Lock Brake System) MODULE TO HCU (Hydraulic Control Unit) TORQUE VALUES

1. Verify all ABS (Anti-Lock Brake System) module-to- HCU (Hydraulic Control Unit) fasteners are tightened to their correct torque specifications. REFER to Torque Specifications .

Are the fasteners tightened to the correct specifications?






4. CHECK FOR DTCs (Diagnostic Trouble Codes) C0044:28, C0044:49 AND C0044:64

1. Ignition ON.

2. Using a scan tool, clear all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

3. Test drive the vehicle at speeds greater than 32 km/h (19.9 mph).

4. Ignition ON.

5. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.

Are DTCs (Diagnostic Trouble Codes) C0044:28, C0044:49 and/or C0044:64 present?