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Home >> Chevrolet >> 2017 >> Cruze L >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LE2) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P163A: Control Module Fuel Pressure Regulator Control System >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition/Vehicle 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. NOTE:

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

  2. Test for 1.09 - 1.21 Ω at 20°C (68°F) between the high control circuit terminal 2 and the low control circuit terminal 1 on the G18 High Pressure Fuel Pump.
    • If not between 1.09 - 1.21 Ω 

      Replace the G18 High Pressure Fuel Pump.

    • If between 1.09 - 1.21 Ω 
  3. Ignition ON, verify that a test lamp does not illuminate between ground and the terminals listed below:
    • High control circuit terminal 2
    • Low control circuit terminal 1
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the appropriate harness connector at the K20 Engine Control Module, 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 
  4. Test for B+ between the high control circuit terminal 2 and ground.
    • If less than B+ 
    1. Ignition OFF, disconnect the appropriate harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the high 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 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.
    • If B+ 
  5. Ignition OFF, connect a test lamp between the high control circuit terminal 2 and the low control circuit terminal 1.
  6. Ignition ON, command the Fuel Pressure Regulator On and Off with a scan tool.
  7. Verify the test lamp turns ON and OFF.
    • If the test lamp does not turn ON and OFF 
    1. Ignition OFF, disconnect the appropriate harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the low control circuit terminal 1 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 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.
    • If the test lamp turns ON and OFF 
  8. Test or replace the G18 High Pressure Fuel Pump.
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