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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 276 (Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To DTC P0246) >> Diagnostic Information and Procedures >> DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance (LTG) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    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.
    • Missing, restricted or leaking exhaust components.
    • 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 or If one or more cylinders indicate low compression

      Refer to: Symptoms - Engine Mechanical (LTG)

    • If a condition exists, repair or replace as necessary 
    • 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
    • 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
    • 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
    • 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
    • If less than 0.2 V 
  10. Test or replace the component: B74 Manifold Absolute Pressure Sensor
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