DTC P0654 Engine Speed Output Circuit

The engine control module (ECM) creates the engine speed output signal by pulsing the circuit to ground. The ECM monitors the voltage on the engine speed output circuit. If the ECM determines that the voltage is out of the normal operating range, a DTC sets.

The engine is running.

The ECM detects an open, short to ground, or a short to voltage on the engine speed output circuit.

DTC P0654 is a Type C DTC.

DTC P0654 is a Type C DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Engine Controls Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Special Tools

J 33431-C Signal Generator and Instrument Panel Tester

With the engine idling for 1 minute, observe the DTC information with a scan tool. DTC P0654 should not set.

1. Ignition ON, observe the DTC info with a scan tool. Verify that DTCs P0656, and P1668 are not also set.

⇒	If DTCs P0656 and P1668 are also set, test the ignition 1 voltage circuit and the ground circuit of the instrument panel cluster (IPC) for an open, short to ground, or high resistance.

⇒	If the circuits/connections test normal, replace the IPC.

2. Ignition OFF, disconnect the harness connector of the ECM.
3. Install the J 33431-C between the engine speed output circuit and the negative terminal of the battery.
4. Ignition ON, set the J 33431-C to generate a speedometer signal. Verify the tachometer operation.

⇒	If the tachometer does not operate, test the engine speed output circuit for an open, short to ground, short to voltage, or a high resistance. If the circuit/connections test normal, replace the IPC.

5. If all circuits/connections test normal, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.