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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 2.4L - DTC P0628 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Fuel Injector Circuit Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, all vehicle systems OFF, disconnect the X3 harness connector at the K20 Engine Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for infinite resistance between the appropriate Q17 Fuel Injector control + circuit and ground.
    • If less than infinite resistance 
    1. Disconnect the harness connector of the Q17 Fuel Injector.
    2. Test for infinite resistance between the Q17 Fuel Injector control + circuit and ground.
      • If infinite resistance
    3. Test for infinite resistance between the Q17 Fuel Injector control - circuit and ground.
      • If less than infinite, repair the short to ground in the circuit.
      • If infinite, replace the Q17 Fuel Injector.
    • If infinite resistance 
  3. Ignition ON.
  4. Test for less than 1V between the Q17 Fuel Injector control + circuit and ground.
    • If 1V or greater 
    1. Disconnect the harness connector of the Q17 Fuel Injector, ignition ON.
    2. Test for less than 1V between the Q17 Fuel Injector control + circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, repair the short to voltage on the control - circuit.
    • If less than 1V 
  5. Ignition OFF.
  6. Test for less than 3Ω between the Q17 Fuel Injector control + circuit and control - circuit.
    • If 3Ω or greater 
    1. Disconnect the harness connector of the Q17 Fuel Injector.
    2. Test for less than 2Ω on the control + circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω
    3. Test for less than 2Ω on the control - circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the Q17 Fuel Injector.
    • If less than 3Ω 
  7. Replace the K20 Engine Control Module.
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