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Home >> Chevrolet >> 2009 >> Traverse LS, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0191 >> DTC P0090, P0091, or P0092 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF.
  2. Disconnect the harness connector at the high pressure fuel pump.
  3. Engine operating, verify that a test lamp flashes between the FRP regulator low circuit terminal 1 and B+.
    • If the test lamp is always ON, test the FRP regulator low circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the FRP regulator low circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, verify that a test lamp illuminates between the FRP regulator high circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the FRP regulator high circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the high pressure fuel pump.
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