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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls And Fuel - 2.0L (LTG) - Diagnostic Information And Procedures (P0010 - P0333)) >> 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.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Verify the following conditions do not exist:
    • Collapsed or restricted intake air duct.
    • Leaking or restricted component:Exhaust System
    • Leaking, missing or damaged O-ring on the components listed below:
      • B74 Manifold Absolute Pressure Sensor
    • Engine vacuum leaks.
    • An engine mechanical condition. - Wear of timing chain, tensioner or sprockets. If one or more cylinders indicate low compression

      Refer to Symptoms - Engine Mechanical

    • If a condition exists - Repair or replace as necessary 
    • Go to next step: If no condition exists 
  3. Disconnect the electrical connector:B74 Manifold Absolute Pressure Sensor
  4. Test for less than 10 Ω between the test points:Low Reference circuit terminal 2 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector:K20 Engine Control Module
    2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 2 @ Component harness & Terminal 21 X2 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K20 Engine Control Module
    • Go to next step: If less than 10 Ω 
  5. Ignition - On / Vehicle - In Service Mode
  6. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 1 & Low Reference circuit terminal 2
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: 5 V Reference circuit terminal 1 @ Component harness & Terminal 5 X2 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K20 Engine Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K20 Engine Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  7. Verify the scan tool parameter:MAP Sensor = Greater than 4.7 V
    • If 4.7 V or less 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K20 Engine Control Module
    • Go to next step: If greater than 4.7 V 
  8. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 3 & Low Reference circuit terminal 2
  9. Verify the scan tool parameter:MAP Sensor = Less than 0.2 V
    • If 0.2 V or greater 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 Ω between the test points:Signal circuit terminal 3 @ Component harness & Terminal 40 X3 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K20 Engine Control Module
    • Go to next step: If less than 0.2 V 
  10. Test or replace the component:B74 Manifold Absolute Pressure Sensor
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