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Home >> Buick >> 2017 >> Verano Base, Gas >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 2.4L (Lea) - DTC P0010 To DTC P0328 >> Diagnostic Information and Procedures >> DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance >> Circuit/System Testing

Circuit/System Testing

  1. Verify the integrity of the entire air induction system and verify that none of the following conditions exist:
    • Any damaged components
    • An air flow restriction
    • Any vacuum leak
    • Improperly routed vacuum hoses
    • A restriction in the MAP Sensor port or the BARO port
    • Proper operation of the Positive Crankcase Ventilation (PCV) system
    • In cold climates, inspect for any snow or ice buildup at the BARO port on the ECM
    • Missing, restricted or leaking exhaust components. Refer to Symptoms - Engine Exhaust .
    • Engine mechanical condition; for example: low compression or incorrect timing chain installation. Refer to Symptoms - Engine Mechanical .
    • If a condition is found 

      If a condition is found, repair or replace the component as appropriate.

    • If no condition is found 
  2. Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down. Disconnect the harness connector at the B74 Manifold Absolute Pressure Sensor.
  3. Test for less than 2 Ω between the low reference circuit terminal 2 and ground.
    • If 2 Ω or greater 
    1. Ignition OFF, disconnect the 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 less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 2 Ω 
  4. Ignition ON.
  5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the 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, replace the K20 Engine Control Module.
      NOTE:

      If the signal circuit is shorted to a voltage the ECM or the MAP Sensor may be damaged.

    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Ignition ON, 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 
  6. Ignition ON.
  7. Verify the scan tool MAP Sensor parameter is less than 0.5 V.
    • If 0.5 V or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Ignition ON,
    3. Test for less than 1 V between the signal circuit terminal 3 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 less than 0.5 V 
  8. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
  9. Ignition ON.
  10. Verify the scan tool MAP Sensor voltage parameter is greater than 4.5 V.
    • If 4.5 V or less 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Remove the jumper wire,
    3. Test for infinite resistance between the signal circuit terminal 3 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 or high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 4.5 V 
  11. Test or replace the B74 Manifold Absolute Pressure Sensor.
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