DTC C0244 or P1689. Isuzu Ascender

For 1990-2009 cars only

Makes 🢒 Isuzu 🢒 2009 🢒 Ascender - 4WD 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C0244 or P1689

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0244: Pulse Width Modulated (PWM) Delivered Torque

DTC P1689: Traction Control Delivered Torque Output Circuit

The electronic brake control module (EBCM) and the powertrain control module (PCM) simultaneously control the traction control system (TCS). The PCM sends a Delivered Torque message via a pulse width modulated (PWM) signal to the EBCM. The duty cycle of the signal is used to determine how much engine torque the PCM is delivering. Normal values are between 10 and 90 percent duty cycle. The EBCM supplies the pull up voltage that the PCM switches to ground to create the signal.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

C0244

The EBCM has detected an open, short to power or short to ground on the delivered torque signal circuit.

P1689

One of the following conditions exists:

•	The PCM detects that delivered torque signal is out of the valid range.

•	The PCM does not receive the delivered torque signal.

Action Taken When the DTC Sets

When the DTC sets the TCS cannot reduce engine torque, however the brake intervention portion of the TCS system remains operational.

Conditions for Clearing the DTC

•	The condition for the DTC is no longer present and you used the scan tool Clear DTC function.

•	The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

•	The PCM automatically clears the history DTC when a current DTC is not detected in 40 consecutive warm-up cycles.

Diagnostic Aids

Check for poor or intermittent connections of the EBCM and the PCM. Refer to Testing for Intermittent Conditions and Poor Connections.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for Scan Tool Information

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.