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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 353 (Engine Controls And Fuel - 2.5L (LCV) - DTC P0010 To DTC P0366) >> Diagnostic Information and Procedures >> DTC P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, or P2157: Cylinder Injector Control >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, all vehicle systems OFF, disconnect the 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 less than infinite, repair the short to ground in the circuit.
      • 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 1 V between the Q17 Fuel Injector control + circuit and ground.
    • If 1 V or greater 
    1. Disconnect the harness connector of the Q17 Fuel Injector, ignition ON.
    2. Test for less than 1 V between the 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, repair the short to voltage on the control - circuit.
    • If less than 1 V 
  5. Ignition OFF.
  6. Test for less than 3 Ω between the Q17 Fuel Injector control + circuit and control - circuit.
    • If 3 Ω or greater 
    1. Disconnect the harness connector of the Q17 Fuel Injector.
    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 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, replace the Q17 Fuel Injector.
    • If less than 3 Ω 
  7. Replace the K20 Engine Control Module.
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