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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 793 (Engine Controls And Fuel - 2.0L - DTC P0243 To DTC P0700) >> DTC P0627, P0628, or P0629 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: An open or a short to voltage in the control circuit will cause both the Ckt. Open Test Status and the Ckt. Short Volts Test Status parameters to display Fault.
  1. Ignition ON, command the fuel pump relay ON and OFF with a scan tool while observing the following control circuit status parameters:
    • Fuel pump relay Ckt. Short Gnd Test Status
    • Fuel pump relay Ckt. Open Test Status
    • Fuel pump relay Ckt. Short Volts Test Status
  2. Each parameter should toggle between OK and Not Run, or Not Run and OK.
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