Antilock Brake System - Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW
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 Instructionsprovides an overview of each diagnostic category.
DTC Descriptor
DTC C0201 01
- Antilock Brake System (ABS) Enable Relay Contact Circuit Short to Battery
DTC C0201 04
- Antilock Brake System (ABS) Enable Relay Contact Circuit Open
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 9.5 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 antilock brake system (ABS), traction control system, and the dynamic rear proportion for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The Traction Control indicator turns ON.
* The red Brake Warning indicator turns ON.
* The driver information center displays the SERVICE BRAKE SYSTEM/TRACTION SYSTEM message.
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 Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
ABS Description and Operation ABS (Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW)
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 Relearningfor scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be battery voltage.
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 1
* Terminal 25
• If greater than the specified range, test the ground circuits for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground.
* Terminal 13
* Terminal 38
• If the test lamp does not illuminate, test the B+ circuits 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 Verification Tests after completing the diagnostic procedure.
Control Module References Programming and Relearningfor EBCM replacement, setup, and programming