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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Controls And Fuel - 2.4L - DTC P0114 To DTC P0604) >> Diagnostic Information and Procedures >> DTC P018B-P018D: Fuel Pressure Sensor (Fuel Pump Power Control Module) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B47 fuel pressure sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5Ω between the low reference circuit terminal 2 and ground.
    • If 5Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 ECM.
    2. Test for less than 2Ω in the low reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 ECM.
    • If less than 5Ω 
  3. Ignition ON.
  4. Test for 4.8-5.2V between the 5V reference circuit terminal 3 and ground.
    • If less than 4.8V 
    1. Ignition OFF, disconnect the harness connector at the K20 ECM.
    2. Test for infinite resistance between the 5V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the 5V reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 ECM.
    • If greater than 5.2V 
    1. Ignition OFF, disconnect the harness connector at the K20 ECM.
    2. Test for less than 1V between the 5V reference circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K20 ECM.
    • If between 4.8-5.2V 
  5. Verify the scan tool Fuel Pressure Sensor voltage parameter is less than 1V.
    • If 1V or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 ECM, ignition ON.
    2. Test for less than 1V between the signal circuit terminal 1 and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K20 ECM.
    • If less than 1V 
  6. Install a 3A fused jumper wire between the signal circuit terminal 1 and the 5V reference circuit terminal 3, wait 15 seconds.
  7. Verify the scan tool Fuel Pressure Sensor voltage parameter is greater than 4.8V.
    • If 4.8V or less 
    1. Ignition OFF, disconnect the harness connector at the K20 ECM.
    2. Test for infinite resistance between the signal 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 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 ECM.
    • If greater than 4.8V 
  8. Replace the B47 fuel pressure sensor.
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