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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 Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the FPCM relay.
  2. Ignition OFF, connect a DMM, set on the volt setting, between the PWM control circuit terminal 1 and ground.
  3. Ignition ON, command the ECM fuel pump ON with a scan tool. The DMM reading should be between 4.5-5.5 V.
    • If less than the specified range, test the PWM control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FPCM.
    • If greater than the specified range, test the PWM control circuit for a short to voltage. If the circuit tests normal, replace the FPCM.
  4. If all circuits test normal, replace the FPCM relay.
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