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Home >> Hummer >> 2004 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC P0654: Engine Speed Output Circuit >> Circuit Description

Circuit Description

The powertrain control module (PCM) creates the engine speed signal by pulsing the circuit to ground. The PCM monitors the voltage on the engine speed signal circuit. If the PCM determines that the voltage is not within the normal operating range, the PCM sets a DTC.

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