C1241

DTC C1241

Diagnostic Instructions

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

DTC Descriptor
DTC C1241
- ECU Voltage

Circuit/System Description

The electronic brake control module (EBCM) monitors the ignition positive voltage level available for Antilock Brake System (ABS) operation.

Conditions for Running the DTC

The vehicle speed is greater than 3 km/h (2 mph).

Conditions for Setting the DTC

* The ignition positive voltage is less than 9.5 volts for 10 seconds.
* The ignition positive voltage is greater than 17.4 volts for 1 second.

Action Taken When the DTC Sets

* The ABS is disabled.
* The ABS warning indicator turns ON.
* The traction control and vehicle stability control (VSC) is disabled, if equipped.
* The VSC warning indicator turns ON, if equipped.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 1 ohm between the terminals 1, 13 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, check for 11-14V between terminals, 12, 24, 34 and ground.

• If the voltage is not as specified, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BPMV.

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming