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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P040B - P204D)) >> Diagnostic Information And Procedures >> DTC P1248, P1249, P124A, Or P124B: Cylinder 1-4 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, it may take up to 2 min for all vehicle systems to power down.
  2. Disconnect the harness connector at the appropriate Q17 Fuel Injector.
  3. Ignition On.
  4. Test for 4.5 - 6.5 V between the high voltage supply circuit terminal 1 and ground.
    • If less than 4.5 V 
    1. Ignition Off.
    2. Disconnect the X2 harness connector at the K20 Engine Control Module.
    3. Test for infinite resistance between the supply circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω in the supply circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater 6.5 V 
    1. Ignition Off.
    2. Disconnect the harness connector X2 at the K20 Engine Control Module, Ignition On.
    3. Test for less than 1 V between the high voltage supply circuit terminal 1 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • Go to next step: If between 4.5 - 6.5 V 
  5. Test for 0.60 - 0.80 V between the high voltage control circuit terminal 2 and ground.
    • If less than 0.60 V 
    1. Ignition Off.
    2. Disconnect the harness connector X2 at the K20 Engine Control Module.
    3. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. 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, replace the K20 Engine Control Module.
    • If greater than 0.80 V 
    1. Ignition Off.
    2. Disconnect the harness connector X2 at the K20 Engine Control Module, Ignition On.
    3. Test for less than 1 V between the control circuit terminal 2 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • Go to next step: If between 0.60 - 0.80 V 
  6. Test or replace the appropriate Q17 Fuel Injector.
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