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Home >> Chevrolet >> 2009 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.2L, Or 7.0L - DTC P0601 To DTC P2534 >> DTC P129F >> Circuit/System Description

Circuit/System Description

The engine control module (ECM) supplies voltage to the fuel pump control module (FPCM) when the ECM detects that the ignition is on. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received.

The FPCM provides a control enable input circuit to the FPCM relay to turn the 3-phase fuel pump ON and OFF. The control enable input circuit is switched to ground to turn ON the pump. The FPCM also sends a 400 HZ PWM on a signal circuit to the FPCM relay to control the fuel pump speed by varying the duty cycle of this signal.

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