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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To DTC P0333 >> Diagnostic Information and Procedures >> DTC P0237 or P0238: Turbocharger Boost Sensor >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the B111B Turbocharger boost/intake air temperature sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5Ω between the low reference circuit terminal 1 and ground.
    • If 5Ω or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine control module.
    2. Test for less than 2Ω in the low reference 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 less than 5Ω 
  3. Ignition ON.
  4. Test for 4.8-5.2V between the 5V reference circuit terminal 3 and ground.
    • If less than 4.8V 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine control module.
    2. Test for infinite resistance between the 5V 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 2Ω in the 5V reference 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.
      NOTE:

      If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.

    • If greater than 5.2V 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine control module, ignition ON.
    2. Test for less than 1V between the 5V reference 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 4.8-5.2V 
  5. Verify the scan tool Boost Pressure Sensor voltage parameter is less than 0.2V.
    • If 0.2V or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine control module, ignition ON.
    2. Test for less than 1V between the signal circuit terminal 4 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 less than 0.2V 
  6. Install a 3A fused jumper wire between the signal circuit terminal 4 and the 5V reference circuit terminal 3.
  7. Verify the scan tool Boost Pressure Sensor voltage parameter is greater than 4.5V.
    • If 4.5V or less 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine control module.
    2. Test for infinite resistance between the signal circuit terminal 4 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 signal circuit end to end.
      • If 2Ω or greater, repair the open or high resistance in the circuit.
      • If less than 2Ω, replace the K20 Engine control module.
    • If greater than 4.5V 
  8. Test or replace the B111B Turbocharger boost/intake air temperature sensor.
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