P0654

DTC C0236 or P0654

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 C0236 00: Traction Control System (TCS) Engine RPM Signal Circuit
DTC P0654: Engine Speed Output Circuit

Diagnostic Fault Information






Circuit/System Description

The engine control module (ECM)/powertrain control module (PCM) engine speed signal circuit provides the EBCM with an indication of engine RPM to help determine TCS control methods and rates when a TCS event takes place.

Conditions for Running the DTC

- Engine Running.
- After 2 seconds starting, and if there is a undervoltage condition.

Conditions for Setting the DTC

An open/high resistance, or short to ground on the engine speed signal circuit.

Action Taken When the DTC Sets

- The EBCM disables traction control system (TCS) for the duration of the ignition cycle.
- A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

- The condition for the DTC is no longer present in the last 100 ignition cycles and no DTCS have been detected.
- The condition for the DTC is no longer present.

Circuit/System Verification

Engine Running, with the scan tool observe the EBCM Engine Speed parameter and the ECM/PCM Engine Speed parameter. The reading should increase and decrease when pressing and releasing the accelerator pedal.

Circuit/System Testing

1. Ignition OFF, disconnect the C1 harness connector at the EBCM.
2. Ignition ON, test for B+ between the signal circuit terminal listed below and ground.
- Terminal 11
- Terminal 7 (JL4)
- If less than the specified value, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM/PCM.
3. Replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM, PCM, or ECM replacement, setup, and programming