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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P0016 - P049D)) >> Diagnostic Information And Procedures >> DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  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 vane position actuator
    • Loose or improper installation of the turbocharger and the charge air cooler, including the inlet and outlet ducts
    • 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
    • A restriction in the MAP Sensor 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 necessary.

    • Go to next step: 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 B65 Intake Manifold Pressure and Air Temperature Sensor.
  3. Test for less than 5 Ω between the low reference circuit terminal 3 and ground.
    • If 5 Ω or greater 
    1. Disconnect the harness connector X2 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.
    • Go to next step: If less than 5 Ω 
  4. Ignition On.
  5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 2 and ground.
    • If less than 4.8 V 
    1. Ignition Off, disconnect harness connector X2 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.
    • If greater than 5.2 V 
    1. Ignition Off, disconnect harness connector X2 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.
    • Go to next step: If between 4.8 - 5.2 V 
  6. Verify the scan tool MAP Sensor voltage parameter is greater than 4.7 V.
    • If 4.7 V or less 
    1. Ignition Off, disconnect the harness connector X2 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, replace the K20 Engine Control Module.
    • Go to next step: If greater than 4.7 V 
    7. NOTE:

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

  7. Connect a 3 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 3.
  8. Verify the scan tool MAP Sensor voltage parameter is less than 0.2 V.
    • If 0.2 V or greater 
    1. Ignition Off, remove the jumper wire, disconnect the harness connector X2 at the K20 Engine Control Module.
    2. Ignition On.
    3. Test for less than 1 V between the signal circuit terminal 4 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    4. Ignition Off.
    5. 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.
    • Go to next step: If less than 0.2 V 
  9. Test or replace the B65 Intake Manifold Pressure and Air Temperature Sensor.
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