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Home >> Buick >> 2015 >> Verano Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Controls And Fuel - 2.4L (Lea) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0340, P0341, P0365, or P0366: Intake/Exhaust Camshaft Position Sensor >> 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 harness connector at the appropriate B23 Camshaft Position Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the low reference circuit terminal B and ground.
    • If 5 Ω or greater 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If 2 Ω or less, replace the K20 Engine Control Module.
    • If less than 5 Ω 
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, eplace the K20 Engine Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit 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.
    • If between 4.8-5.2 V 
  5. Test for 4.8-5.2 V between the signal circuit terminal C and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. 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.
    3. 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 greater than 5.2 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, ignition ON.
    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, replace the K20 Engine Control Module.
    • If between 4.8-5.2 V 
  6. Verify DTC P0341 or P0366 is not set.
    • If any of the DTCs are set 

      Inspect for the conditions listed below:

    • Excessive play or looseness of the B23 Camshaft Position Sensor or the reluctor wheel
    • Improper installation of the B23 Camshaft Position Sensor
    • Foreign material passing between the B23 Camshaft Position Sensor and the reluctor wheel
    • Damaged reluctor wheel
    • Excessive air gap between the B23 Camshaft Position Sensor and the reluctor wheel
    • Engine oil for debris
    • Timing chain, tensioner, and sprockets for wear or damage
      • If any of the conditions above are found, repair as necessary.
      • If all components test normal, test or replace the B23 Camshaft Position Sensor.
    • If none of the DTCs are set 
  7. Test or replace the B23 Camshaft Position Sensor.
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