C0201

DTC C0201

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC C0201 00
- Antilock Brake System (ABS) Enable Relay Contact Circuit

Diagnostic Fault Information






Circuit/System Description

The solenoid relay, located within the electronic brake control module (EBCM), supplies battery voltage to all of the valve solenoids.

Conditions for Running the DTC

* Ignition voltage is greater than 9.6 volts.
* The solenoid relay is commanded ON.

Conditions for Setting the DTC

One or more of the following conditions exists:

* The EBCM detects an open in the battery positive voltage circuit to the solenoid valve relay.
* The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.

Action Taken When the DTC Sets

* The EBCM disables the ABS, dynamic rear proportion (DRP), Traction Control ( TC), Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The red brake warning indicator turns ON.
* The TC warning indicator turns ON.

Conditions for Clearing the DTC

* The condition for setting 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.

Reference Information
Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation Reference

ABS Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for EBCM

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the EBCM.
2. Test for less than 1.0 ohm between the ground circuit terminal 16 and ground.

• If 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+ circuit terminal 2 and ground.

• If 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 fuse is open, replace the EBCM.

4. If all circuits test normal, replace the EBCM and verify DTC does not reset, if DTC reset replace the BPMV.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Brake Pressure Modulator Valve Replacement Brake Pressure Modulator Valve Replacement

Control Module References Programming and Relearning for EBCM replacement, setup, and programming