This procedure covers the removal and replacement of the Manifold Absolute Pressure (MAP) sensor on the 3.5L EcoBoost engine, including proper electrical connector handling and torque specifications.

Warnings

Tools required

Parts

• Manifold Absolute Pressure (MAP) Sensor × 1 — Motorcraft CM-5229 or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition to OFF position and remove key
3. Open hood and secure with prop rod
4. Allow engine to cool to ambient temperature if recently operated

Procedure

1. 1

   Disconnect battery negative terminal
   Disconnect the negative battery terminal to prevent electrical issues during sensor replacement. Use a 10mm wrench to loosen the terminal clamp nut and carefully remove the cable, positioning it away from the battery post.
2. 2

   Locate MAP sensor
   Locate the MAP sensor on the intake manifold. On the 3.5L EcoBoost, the MAP sensor is mounted on the upper intake manifold near the firewall on the driver's side. It is a small cylindrical sensor with a single electrical connector.
3. 3

   Disconnect electrical connector
   Press down on the locking tab of the electrical connector while pulling the connector away from the MAP sensor. If the connector is difficult to remove, gently wiggle it while applying pressure to the release tab. Do not pull on the wires.
4. 4

   Remove MAP sensor mounting screws
   Using a 10mm socket and 1/4 inch ratchet, remove the two mounting screws securing the MAP sensor to the intake manifold. Keep the screws in a safe location for reinstallation.
   Torque spec

   MAP Sensor Screws3 Nm (2 lb-ft)
5. 5

   Remove MAP sensor
   Carefully pull the MAP sensor straight out from the intake manifold. The sensor has an o-ring seal that may cause slight resistance. Inspect the mounting location for debris or damage.
6. 6

   Inspect and clean mounting surface
   Inspect the intake manifold mounting bore for any debris, dirt, or damage. Clean the area with electrical contact cleaner if needed. Check the old sensor's o-ring to ensure it came out with the sensor and did not remain in the manifold bore.
7. 7

   Install new MAP sensor
   Verify the new MAP sensor has an o-ring seal installed. If desired, apply a light coating of dielectric grease to the o-ring. Insert the new sensor straight into the manifold bore, ensuring it seats fully against the mounting surface.
8. 8

   Install and torque mounting screws
   Install the two mounting screws and hand-tighten them evenly in a cross pattern. Using a torque wrench, tighten the screws to 3.0 Nm (2.0 lb-ft) in a cross pattern. Do not overtighten as this can damage the sensor housing.
   Torque spec

   MAP Sensor Screws3 Nm (2 lb-ft)
9. 9

   Reconnect electrical connector
   Push the electrical connector onto the MAP sensor until you hear or feel a positive click, indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked in place.
10. 10

    Reconnect battery
    Reconnect the negative battery terminal and tighten the clamp nut securely with a 10mm wrench. Ensure the connection is clean and tight.

Reassembly

1. Ensure all electrical connections are secure and properly locked
2. Verify no tools or parts were left in the engine compartment
3. Close hood securely

Verification

• Turn ignition to ON position without starting engine and verify Check Engine Light performs normal bulb check cycle
• Start engine and allow it to idle, checking for smooth operation with no rough idle
• Verify no diagnostic trouble codes are present using an OBD-II scanner
• Check for any vacuum leaks around the MAP sensor installation by listening for hissing sounds
• Test drive vehicle to confirm proper engine performance under acceleration and load conditions

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