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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 167 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0650 To DTC P3436 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, or P216F: Cylinder Injector >> 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 Open is not displayed 
    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 + 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 + 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 Open is displayed 
    4. 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.

  4. 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 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, test or replace the Q17 Fuel Injector.
    • If infinite resistance 
  5. Ignition ON.
  6. 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 
  7. Replace the K20 Engine Control Module.
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