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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 P12A7 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X469 harness connector at the LH fuel tank jumper.
  2. Ignition OFF, test for less than 1 Ω between the low reference circuit terminal G and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance.
  3. Ignition OFF, connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • Harness connector terminal A
    • Harness connector terminal B
    • Harness connector terminal C
  4. Ignition ON, command the fuel pump ON and OFF using the FPCM scan tool. The test lamp should turn ON and OFF, as commanded.
    • If the test lamp is always ON, test circuit for a short to voltage. If the circuit tests normal, replace the FPCM relay.
    • If the test lamp is always OFF, test circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FPCM relay.
  5. If all circuits test normal, perform the Fuel System Diagnosis. Refer to Fuel System Diagnosis (W/LS3 or LS7) or Fuel System Diagnosis (W/LS9)
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