This procedure covers the removal and replacement of the Manifold Absolute Pressure (MAP) sensor on the 2014-2019 Toyota Corolla with 1.8L I4 engine.

Warnings

Tools required

Parts

• Manifold Absolute Pressure (MAP) Sensor × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Disconnect the negative battery terminal and wait 2 minutes to allow electrical system to discharge
3. Locate the MAP sensor on the intake manifold near the throttle body

Procedure

1. 1

   Access the MAP sensor
   Open the hood and locate the MAP sensor on the intake manifold. It is positioned on the upper portion of the manifold, typically on the passenger side near the throttle body. The sensor is a small black plastic component with an electrical connector.
2. 2

   Disconnect the electrical connector
   Press down on the locking tab of the electrical connector while pulling it straight away from the MAP sensor. Do not pull on the wires themselves. If the connector is difficult to remove, gently wiggle it side to side while applying outward pressure.
3. 3

   Remove the MAP sensor mounting screws
   Using a 10mm socket or appropriate screwdriver, remove the mounting screw(s) securing the MAP sensor to the intake manifold. There may be one or two screws depending on the sensor design. Keep the screws in a safe location for reinstallation.
   ⚠Be careful not to drop screws into the engine bay. They may fall into areas difficult to retrieve.
4. 4

   Remove the MAP sensor
   Carefully pull the MAP sensor straight out from the intake manifold. The sensor may have an O-ring seal that creates slight resistance. If stuck, gently twist while pulling to break the seal. Inspect the old sensor and its mounting location.
5. 5

   Clean the mounting surface
   Inspect the MAP sensor port on the intake manifold. Remove any dirt, debris, or old O-ring material from the mounting surface using a clean, lint-free cloth. Ensure no debris falls into the intake manifold opening.
6. 6

   Install the new MAP sensor
   If the new sensor includes a new O-ring or seal, ensure it is properly seated on the sensor body. Apply a small amount of dielectric grease to the O-ring if desired for easier installation and future removal. Align the sensor with the mounting hole and press firmly into place until it seats completely against the manifold.
7. 7

   Install and torque the mounting screws
   Thread the mounting screw(s) by hand to prevent cross-threading, then tighten to the specified torque using a torque wrench. These screws secure the sensor to plastic or aluminum components and over-tightening will cause damage.
   Torque spec

   MAP Sensor Screws3 Nm (2 lb-ft)
8. 8

   Reconnect the electrical connector
   Push the electrical connector straight onto the MAP sensor until you hear or feel a distinct click, indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked in place.
9. 9

   Reconnect the battery
   Reconnect the negative battery terminal. The ECU may store a diagnostic trouble code from the sensor disconnection which should clear after successful operation.

Reassembly

1. Ensure all electrical connections are secure and properly locked
2. Verify no tools or parts were left in the engine bay
3. The MAP sensor installation requires no additional reassembly steps

Verification

• Start the engine and allow it to idle. The engine should run smoothly without hesitation or rough idle
• Check for any diagnostic trouble codes using an OBD-II scanner. Clear any stored codes if related to MAP sensor disconnection
• Test drive the vehicle and verify normal acceleration and throttle response
• Monitor for the check engine light. If it illuminates, retrieve codes to ensure proper sensor installation and function
• Verify there are no vacuum leaks at the sensor mounting location by listening for hissing sounds at idle

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