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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P040B - P204D)) >> Diagnostic Information And Procedures >> DTC P163A: Control Module Fuel Pressure Regulator 1 Control System Circuitry Performance >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition Off, disconnect the harness connector at the Q18A Fuel Pressure Regulator 1, Ignition On.
  2. Verify a test lamp illuminates between the high control circuit terminal 1 and ground.
    • If the test lamp does not illuminate 
    1. Ignition Off, disconnect the X1 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.
    • Go to next step: If the test lamp illuminates 
  3. Ignition Off.
  4. Verify the test lamp is not illuminated
    • If the test lamp illuminates 
    1. Disconnect the X1 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, replace the K20 Engine Control Module.
    • Go to next step: If the test lamp is not illuminated 
  5. Connect a test lamp between the low control circuit terminal 2 and the high control circuit terminal 1.
  6. Ignition On, verify the test lamp turns On and Off when Commanding Fuel Pressure Regulator 1 On and Off with a scan tool.
    • If the test lamp is always Off 
    1. Ignition Off, disconnect the X1 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. Ignition Off.
    4. 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 is always On 
    1. Ignition Off, disconnect the X1 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, replace the K20 Engine Control Module.
    • Go to next step: If the test lamp turns On and Off 
  7. Replace the Q18A Fuel Pressure Regulator 1.
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