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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Engine Controls And Fuel - 3.6L (LF4 LGX) - DTC P0685 LGX To DTC P3436 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2618 or P2619: Crankshaft Position Signal >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
  2. Engine Running at 600-700 RPM.
  3. Test for 550-750 Hz AC between the signal circuit terminal 2 and ground.
    • If not between 550-750 Hz AC 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for infinite resistance between the signal 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 signal 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 between 550-750 Hz AC 
  4. Replace the T3 Audio Amplifier.
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