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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 114 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0107 or P0108 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Dynamic Test - Using Vehicle Harness

    NOTE:

    Circuit/System Testing must be performed before proceeding with Component Testing.

  1. Ignition/Vehicle - Off
  2. Remove the component: B74 Manifold Absolute Pressure Sensor - Leave the electrical connector connected.
  3. Install the special tool: EN-23738-A Vacuum Pump @ B74 Manifold Absolute Pressure Sensor
  4. Use the tool to achieve a gauge reading between -13 and -21 kPa (-0. 13 and -0. 21 bar, -3. 8 and -6. 2 in Hg).

    Verify the scan tool parameter: MAP Sensor = Decreases between 13 and 21 kPa (1. 9 and 3. 0 PSI)

    • If the parameter does not decrease between 13 and 21 kPa (1. 9 and 3. 0 PSI) 

      Replace the component: B74 Manifold Absolute Pressure Sensor

    • Go to next step: If the parameter decreases between 13 and 21 kPa (1. 9 and 3. 0 PSI) 
  5. Use the tool to achieve a gauge reading between -30 and -38 kPa (-0. 3 and -0. 38 bar, -8. 8 and -11. 2 in Hg).

    Verify the scan tool parameter: MAP Sensor = Decreases between 30 and 38 kPa (4. 4 and 5. 5 PSI)

    • If the parameter does not decrease between 30 and 38 kPa (4. 4 and 5. 5 PSI) 

      Replace the component: B74 Manifold Absolute Pressure Sensor

    • Go to next step: If the parameter decreases between 30 and 38 kPa (4. 4 and 5. 5 PSI) 
  6. All OK.

Dynamic Test - Using Jumper Wires

  1. Ignition/Vehicle - Off
  2. Remove the component: B74 Manifold Absolute Pressure Sensor
  3. Connect a 3 A fused jumper wire between the test points: 5 V Reference terminal 3 & 5 V
  4. Connect a jumper wire between the test points: Low Reference terminal 1 & Ground
  5. Connect a DMM between the test points: Signal terminal 4 @ B74 Manifold Absolute Pressure Sensor & Ground
  6. Install the special tool: EN-23738-A Vacuum Pump @ B74 Manifold Absolute Pressure Sensor
  7. Use the tool to achieve a gauge reading between 0 and -15 kPa (0 and -0. 15 bar, 0 and -4. 4 in Hg).

    Verify the DMM displays between 0. 2 and 4. 9 V. - The value should not spike or drop out.

    • If not between 0. 2 and 4. 9 V or has spikes or drops out 

      Replace the component: B74 Manifold Absolute Pressure Sensor

    • Go to next step: If between 0. 2 and 4. 9 V and there are no spikes or drops out 
  8. All OK.
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