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Home >> Buick >> 2016 >> Envision >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0243 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P163A: Control Module Fuel Pressure Regulator 1 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.
    2. NOTE:

    The DMM and test leads must be calibrated to 0 Ω in order to prevent misdiagnosis.

  2. Test for 0.3-0.7 Ω at 20°C (68°F) between the high control circuit terminal 1 and the low control circuit terminal 2 on the G18 High Pressure Fuel Pump.
    • If not between 0.3-0.7 Ω  

      Replace the G18 High Pressure Fuel Pump.

    • If between 0.3-0.7 Ω 
  3. Test for infinite resistance between each terminal on the G18 High Pressure Fuel Pump and the G18 High Pressure Fuel Pump housing.
    • If less than infinite resistance 

      Replace the G18 High Pressure Fuel Pump.

    • If infinite resistance 
  4. Ignition ON, verify that a test lamp does not illuminate between the high control circuit terminal 1 and ground and the low control circuit terminal 2 and ground at the ECM side of the harness connector.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the harness connector at the ECM, ignition ON.
    2. Test for less than 1 V between the appropriate control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  5. Verify that a test lamp does not illuminate between the high control circuit terminal 1 and B+ and the low control circuit terminal 2 and B+.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the harness connector at the ECM.
    2. Test for infinite resistance between the appropriate control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  6. Connect a 3 A fused jumper wire between the high control circuit terminal 1 and ground.
  7. Verify the Fuel Pressure Regulator High Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator High Control Circuit Low Voltage Test Status transitions from OK to Malfunction.
    • The parameters do not change 
    1. Ignition OFF, disconnect the harness connector at the ECM.
    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, replace the K20 Engine Control Module.
    • The parameters change 
  8. Connect a 3 A fused jumper wire between the low control circuit terminal 2 and B+.
  9. Verify the Fuel Pressure Regulator Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator Control Circuit High Voltage Test Status transitions from OK to Malfunction.
    • The parameters do not change 
    1. Ignition OFF, disconnect the harness connector at the ECM.
    2. 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, replace the K20 Engine Control Module.
    • The parameters change 

      Replace the K20 Engine Control Module.

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