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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1693 (Engine Controls And Fuel - 3.6L (LCS) - DTC P0008 To DTC P0193) >> DTC P0090, P0091, or P0092 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function.
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    • If the hood position does not display Open, refer to DTC P254F .
  3. Ignition OFF, disconnect the harness connector X1 at the ECM.
  4. Probe the FRP regulator ignition voltage circuit terminal X1-5 at the ECM harness connector with a test lamp connected to B+. Verify the test lamp does not illuminate.
    • If the test lamp illuminates, test the ignition voltage circuit, and control circuit for a short to ground. If the circuits test normal, replace the high pressure fuel pump.
  5. Test for less than 2 Ω between the FRP regulator ignition voltage circuit terminal X1-5, and the FRP regulator control circuit terminal X1-73 at the ECM harness connector.
    • If greater than the specified range, test the ignition voltage circuit, and control circuit for an open/high resistance. If the circuits test normal, replace the high pressure fuel pump.
  6. Ignition ON, test for less than 1 V between the FRP regulator ignition voltage circuit terminal X1-5 and ground.
    • If greater than the specified range, test the ignition voltage circuit, and control circuit for a short to voltage.
  7. If all circuits test normal, replace the ECM.
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