P0654

DTC P0654: Engine Speed Output Circuit

Wiring Diagram:

Circuit Description
The ECM creates the engine speed output signal using a Pulse Width Modulated (PWM) Signal based on information received from the Crankshaft Position (CKP) sensor. If the ECM determines the failure in the circuit, a DTC sets.

Conditions for Setting the DTC
- Ignition ON.
- An open, short to battery, or short to ground condition exists.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fail. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF at the end of a consecutive validation cycle in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- DTC(s) can be cleared by using the scan tool.

Diagnostic Aids
An Intermittent problem may be caused by a poor connection, rubbed through wire insulation, or wire that is broken inside the insulation. Any circuitry, that is suspected as causing the complaint, should be thoroughly checked for the following conditions.
- Backed-out terminals
- Improper mating
- Broken locks
- Improperly formed
- Damaged terminals
- Poor terminals to wire connection
- Physical damage to the wiring harness

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DTC Troubleshooting