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Home >> Chevrolet >> 2015 >> Traverse LTZ, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 3.6L (LLT) - DTC P0340 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P163A: Control Module Fuel Pressure Regulator >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump. It may take up to 2 min for all vehicle systems to power down.
  2. Verify that a test lamp does not illuminate between the high pressure fuel pump actuator low control circuit terminal 1 and B+.
    • If the test lamp illuminates 
    1. Disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the low control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  3. Ignition ON
  4. Verify a test lamp does not illuminate between the high pressure fuel pump actuator high control terminal 2 and ground.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
    2. Test for less than 1 V between the high control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  5. Verify the test lamp illuminates when the Fuel Pressure Regulator is commanded ON with a scan tool.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the high control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the K20 Engine Control Module.
    • If the test lamp illuminates 
  6. Ignition OFF, connect a test lamp between the high pressure fuel pump actuator low control circuit terminal 1 and B+. Ignition ON.
  7. Verify the test lamp illuminates when the Fuel Pressure Regulator is commanded ON with a scan tool.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
    2. Test for less than 1 V between the low control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the low control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the K20 Engine Control Module.
    • If the test lamp illuminates 
  8. Test or replace the G18 High Pressure Fuel Pump.
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