Under 8600 GVW
DTC C0110 (Under 8600 GVW)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC C0110 00
- Pump Motor Circuit
Circuit/System Description
The pump motor is an integral part of the brake pressure modulator valve (BPMV), while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When Antilock Brake System (ABS) or Traction Control System (TCS) operation is required the EBCM activates the pump motor relay and ground circuit is provided to the pump motor.
Conditions for Running the DTC
* The ignition switch is in the ON position.
* Initialization is complete.
Conditions for Setting the DTC
* The EBCM motor drive circuit detects a short to battery positive, or open ground circuit, and a continuously on or off motor.
* The pump motor continues to rotate briefly after activation creating a feedback voltage. The EBCM sets the code if the measured feedback voltage indicates a binding or stalled pump motor.
Action Taken When the DTC Sets
* The EBCM disables the ABS/TCS/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The Traction Control and VSES indicators turn ON.
* The Traction Control and Stabilitrack displayed on the DIC.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
* An ECE 13 response may be required, after repairs are made, and DTCs are cleared, operate the vehicle at speeds greater than 13 km/h (8 mph) to complete the self test, and the EBCM will turn off the ABS indicator. Refer to ABS Description and Operation (Under 8600 GVW) ABS Description and Operation (Equal to or Over 8600 GVW) for a complete description of ECE 13.
Diagnostic Aids
The pump motor is integral to the BPMV. The pump motor is not serviceable. Inspect the power and ground circuits proper connections.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 1.0 ohm of resistance from ground circuit terminal 38 and ground.
* If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for less than 1.0 ohm of resistance from ground circuit terminal 13 and ground.
* If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
* If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. Verify that a test lamp illuminates between the B+ circuit terminal 25 and ground.
* If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
6. If all circuits test normal, test or replace the BPMV and EBCM assembly.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Brake Pressure Modulator Valve Replacement (JD9, JF3, JF7) Brake Pressure Modulator Valve Replacement (JH6, JH7)
* Refer to Programming and Relearning for EBCM replacement setup and programming. Programming and Relearning