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how to replace map sensor on 2003 Chevrolet TRAILBLAZER?

the map sensor is mounted on the top of intake towards the fire wall.

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Disconnect the manifold absolute pressure (MAP) sensor electrical connector.

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  • Press the retainer locking tabs inward, then pull the retainer (1) up to remove it.
  • Remove the MAP sensor (2).
  • Inspect the MAP sensor seal for damage, and replace as necessary.
  • Remove the air intake duct.
  • Caution: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

    Notice: Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate.

  • Inspect the throttle body bore and the throttle valve plate for deposits. You will need to open the throttle valve in order to inspect all surfaces.
  • Notice: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.

  • Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM top engine cleaner, GM P/N(NNN) NNN-NNNN(Canadian P/N 993026) or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.
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  • Loosen the air cleaner outlet duct and air cleaner outlet resonator clamps (2).
  • Disconnect the electrical connector from the intake air temperature (IAT) sensor (1) .
  • Disconnect the air cleaner outlet duct from the air cleaner outlet resonator.
  • Disconnect the fuel pressure regulator vacuum supply from the air cleaner outlet resonator.
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  • Remove the two air cleaner outlet resonator to engine bolts (4).
  • Disconnect the crankcase ventilation hose (1) from the valve cover port (2).
  • Remove the air cleaner outlet resonator assembly (5) from the engine.


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