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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Controls And Fuel - 1.4L (LUJ LUV) - DTC P0010 To DTC P0246) >> Diagnostic Information and Procedures >> DTC P0106: Manifold Absolute Pressure (MAP) Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the integrity of the entire air induction system and verify that none of the following conditions exist:
    • Any damaged components
    • Improper operation of turbocharger wastegate actuator or bypass valve, if equipped
    • Loose or improper installation of the turbocharger and the charge air cooler, including the flexible ductwork, if equipped
    • An air flow restriction
    • Any vacuum leak
    • Improperly routed vacuum hoses
    • In cold climates, inspect for any snow or ice buildup at the BARO port on the ECM, if equipped
    • A restriction in the MAP Sensor port or the BARO port
    • Proper operation of the positive crankcase ventilation system
    • 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 

      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 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 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 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, verify the scan tool MAP Sensor parameter is less than 0.5 V.
    • If 0.5 V or greater 
    1. Ignition OFF, disconnect the K20 Engine Control Module.
    2. Ignition ON, 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 
  7. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
  8. Ignition ON, verify the scan tool MAP voltage parameter is greater than 4.5 V.
    • If 4.5 V or less 
    1. Ignition OFF, disconnect the K20 Engine Control Module.
    2. Remove the jumper wire, 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
    3. 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 
  9. Test or replace the B74 Manifold Absolute Pressure Sensor.
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