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Home >> Chevrolet >> 2004 >> Optra Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.6L (L91) - DTC P0336 To DTC P1402 >> DTC P0654 >> Circuit Description

Circuit Description

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.

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