LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2016 >> Terrain SL, Gas >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.6L (LFX) - DTC P0351 To P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1248-P124D: Cylinder Injector High Control Circuit Shorted to Control Circuit >> 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 appropriate multi-way harness connector X160 or X161, at the rear of the intake manifold, ignition ON. It may take up to 2 minutes for all vehicle systems to power down.
  2. 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 Engine Control Module side of the multi-way harness connector.

    2. Test for infinite resistance between the appropriate Q17 Fuel Injector high voltage supply circuit and high voltage control circuit.
      • If less than infinite, repair the short between the circuits.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If Open is displayed 
    3. 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.

  3. Ignition OFF, disconnect the harness connector at the appropriate Q17 Fuel Injector.
  4. Test for infinite resistance between the appropriate Q17 Fuel Injector high voltage supply circuit and high voltage control circuit.
    • If less than infinite resistance 

      Repair the short between the circuits.

    • If infinite resistance 
  5. Test or replace the appropriate Q17 Fuel Injector.
scientia non olet · About LEMON Manuals