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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0010 To DTC P0442) >> Diagnostic Information And Procedures >> DTC P0107 Or P0108: Manifold Absolute Pressure (MAP) Sensor Circuit >> Component Testing >> Skewed Sensor Test

Skewed Sensor Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor from the engine. Connect the harness to the sensor, if disconnected.
  2. Ignition ON.
  3. Apply 17 kPa (5.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A  .
  4. Verify the scan tool MAP Sensor pressure parameter decreases between 13 - 21 kPa (1.8 - 3.0 PSI).
    • If the parameter does not decrease between 13 - 21 kPa (1.8 - 3.0 PSI) 

      Replace the B74 Manifold Absolute Pressure Sensor.

    • Go to next step : If the parameter does decrease between 13 - 21 kPa (1.8 - 3.0 PSI) 
  5. Apply 34 kPa (10.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A  .
  6. Verify the scan tool MAP Sensor pressure parameter decreases between 30 - 38 kPa (4.4 - 5.5 PSI).
    • If the parameter does not decrease between 30 - 38 kPa (4.4 - 5.5 PSI) 

      Replace the B74 Manifold Absolute Pressure Sensor.

    • Go to next step : If the parameter does decrease between 30 - 38 kPa (4.4 - 5.5 PSI) 
  7. All OK.
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