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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 278 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0117 (LGX) To DTC P0697) >> Diagnostic Information and Procedures >> DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277: Cylinder Injector Control >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the appropriate multi-way harness connector X160 or X161, at the rear of the intake manifold.
  2. Ignition ON.
  3. Verify the scan tool Cylinder 1-6 Injector Control Circuit Status parameters display Open.
    • If not the specified value 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
      2. NOTE:

      Test on the K20 Engine Control Module side of the multi-way harness connector.

    2. Test for infinite resistance between the appropriate Q17 Fuel Injector control - circuit and ground.
      • If less than infinite, repair the short to ground on the circuit.
      • If infinite resistance
    3. Ignition ON.
    4. Test for less than 1 V between the control - circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the K20 Engine Control Module.
    • If the specified value 
  4. Ignition ON, connect a test lamp between the appropriate Q17 Fuel Injector control + and control - circuits.
  5. Verify the Cylinder 1-6 Injector Control Circuit Status transitions from Open to OK.
    • If the parameter does not transition 
    1. Ignition OFF, remove the test lamp, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω on the control + circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    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, test or replace the K20 Engine Control Module.
    • If the parameter transitions 
    6. NOTE:

    Testing for the following steps is performed on the fuel injector side of the multi-way harness connector. It may be necessary to remove the intake manifold to isolate the condition.

  6. Test for 2-3 Ω between the appropriate Q17 Fuel Injector control + and control - circuits.
    • If less than 2 Ω 
    1. Disconnect the harness connector at the appropriate Q17 Fuel Injector.
    2. Test for infinite resistance between the control + and control - circuits.
      • If less than infinite, repair the short between the circuits.
      • If infinite resistance, test or replace the Q17 Fuel Injector.
    • If greater than 3 Ω 
    1. Disconnect the harness connector at the appropriate Q17 Fuel Injector.
    2. Test for less the 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
    3. Test for less the 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, test or replace the Q17 Fuel Injector.
    • If within 2-3 Ω 
  7. Test for infinite resistance between the appropriate Q17 Fuel Injector control - circuit and ground.
    • If less than infinite resistance 
    1. Disconnect the harness connector at the appropriate Q17 Fuel Injector.
    2. Test for infinite resistance between the control + circuit and ground.
      • If less than infinite, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for infinite resistance between the control - circuit and ground.
      • If less than infinite, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the Q17 Fuel Injector.
    • If infinite resistance 
  8. Ignition ON.
  9. Test for less than 1 V between the appropriate Q17 Fuel Injector control - circuit and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  10. All OK.
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