GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1996 🢒 Chevy Suburban - 4WD 🢒 Engine 🢒 Engine Controls - 5.0L, 5.7L, and 7.4L 🢒 Manifold Absolute Pressure Sensor Replacement

Manifold Absolute Pressure Sensor Replacement 7.4L

Other than checking for a worn grommet and loose electrical connections, the only service possible is unit replacement, if the diagnosis shows the sensor to be faulty.

Removal Procedure
  1. Disconnect the negative battery cable.

    2. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  2. Disconnect the vacuum harness assembly.
  3. Disconnect the electrical connector releasing locking tab.

    4. Object Number: 19673 Size: SH
  4. Remove the bolts or release lock tabs and remove the sensor.

Installation Procedure

    Object Number: 19673 Size: SH
  1. Install the bolts or snap sensor on bracket.
  2. Connect the electrical connector.
  3. Connect the vacuum harness.
  4. Connect the negative battery cable.

Manifold Absolute Pressure Sensor Replacement 5.0L, 5.7L

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.

    2. Object Number: 421253 Size: SH
  2. Disconnect the MAP sensor harness connector.

    3. Notice: Do not rotate or pry on the MAP sensor when removing. Damage to the MAP sensor or the intake manifold may result.


    Object Number: 421259 Size: SH

    Important: If the MAP sensor is to be reused after removing the MAP sensor from the intake manifold, replace the MAP sensor to intake manifold grommet.

  3. Remove the MAP sensor.
  4. Remove the MAP sensor grommet.
  5. Remove the MAP sensor grommet.
  6. Discard the MAP sensor grommet.

Installation Procedure

    Object Number: 421259 Size: SH
  1. Install the new MAP sensor grommet on the MAP sensor.
  2. Install the MAP sensor.

    3. Object Number: 421253 Size: SH
  3. Connect the MAP sensor harness connector.
  4. Connect the negative battery cable.