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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Controls And Fuel - 2.4L - DTC P0114 To DTC P0604) >> Diagnostic Information and Procedures >> DTC P0325, P0327, or P0328: Knock Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the B68 Knock Sensor, ignition ON.
  2. Test for 1-2V between the low signal circuit terminal B and ground.
    • If less than 1V 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module.
    2. Test for infinite resistance between the low signal circuit terminal B and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    3. Test for less than 2Ω in the low signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 engine Control Module.
    • If greater than 2V 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module, ignition ON.
    2. Test for less than 1V between the low signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K20 engine Control Module.
    • If between 1-2V 
  3. Test for 2-4V between the high signal circuit terminal A and ground.
    • If less than 2V 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module.
    2. Test for infinite resistance between the high signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    3. Test for less than 2Ω in the high signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 engine Control Module.
    • If greater than 4V 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module, ignition ON.
    2. Test for less than 1V between the high signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K20 engine Control Module.
    • If between 2-4V 
  4. Test or replace the B68 Knock Sensor.
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