CAPTEUR DE POSITION PAPILLON

The Mitsubishi 1450A132 is the Idle Air Control (IAC) Valve / Idle Speed Control Servo fitted to a wide range of Mitsubishi 4-cylinder and 3.0L/3.5L V6 engines from approximately 1999-2013, plus Chrysler / Dodge applications with the Mitsubishi-sourced 3.0L V6 (Sebring / Stratus / Eclipse / Galant / Lancer / Outlander / Montero / Montero Sport / Pajero IO). Mitsubishi's official catalogue name is "SERVO KIT, THROT BODY IDLE". The component is a 4-wire stepper motor with integrated air bypass passage, mounted on the throttle body downstream of the throttle plate, providing electronic control of idle speed by bypassing measured air volumes around the closed throttle plate at the ECU's command.

The IAC valve performs four idle-speed-management functions: (1) ECU-commanded position control — ECU sends step pulses to stepper motor coils commanding pintle extension/retraction; (2) air bypass metering — pintle moves in tapered passage bypassing measured air volumes around closed throttle plate (retracted = low idle, extended = high idle); (3) cold-start fast idle — cold start ECU commands max extension (1200-1800 RPM); as coolant warms, ECU retracts IAC to warm idle target (650-850 RPM); (4) load compensation — A/C engagement or transmission shift to Drive = ECU extends pintle to compensate for added load, prevents RPM drop / stall.

The IAC valve is a cable-throttle-era component — only fitted to engines with mechanical (cable-operated) throttle bodies. On electronic throttle control (ETC / drive-by-wire) systems — used on Mitsubishi from approx. 2008 onwards — the IAC valve is NOT fitted; idle is controlled directly by the ETC throttle motor. Vehicles using 1450A132 / MD619857 have cable-operated throttles.

Three failure mechanisms: (1) carbon deposit accumulation on pintle and bypass passage (PCV oil vapour blow-by); (2) stepper motor coil burnout (often caused by underlying vacuum leak forcing IAC to max extension); (3) pintle wear / spring fatigue on high-mileage applications. Always inspect and resolve vacuum leaks BEFORE replacing IAC — vacuum leak masquerades as IAC fault.

Note: ok.parts listing shows HS 9031.80 (measuring instruments) which is consistent with the incorrect "Throttle Position Sensor" categorisation. The actual component (Idle Air Control Valve / stepper motor) is correctly classified under HS 8409.91 (parts suitable for use solely or principally with the engines of heading 84.07 — spark-ignition internal combustion piston engines) or alternatively HS 8501.10 (electric motors, less than 37.5W) depending on jurisdiction interpretation. Confirm exact 10-digit subheading with your customs broker — IAC valve classification varies by destination country. Commercial invoice description: idle air control valve / stepper motor with integrated air bypass passage, 4-wire 12V DC stepper motor, automotive throttle body component for cable-operated spark-ignition engine.

Does NOT fit: Mitsubishi vehicles with electronic throttle control (ETC / drive-by-wire) — ETC throttle bodies do NOT have a separate IAC valve, idle is controlled by the ETC motor directly. Mitsubishi began transitioning to ETC from approximately 2008-2010 on most models; verify your vehicle's throttle system type before ordering. Newer Mitsubishi models (post-2013 Lancer, post-2013 Outlander, post-2012 ASX, all PHEV / EV models) — use ETC; this component does not apply. Mitsubishi diesel engines (4D56, 4M40, 4M41, 4N15) — do not have spark ignition IAC valves; idle is controlled by diesel fuel injection only. Other Mitsubishi gasoline engines with different IAC references — Mitsubishi Galant 2.4L 4G64 may use different IAC reference; Lancer Evolution X (CZ4A) uses ETC; verify by reading the OEM number stamped on existing IAC valve before ordering. Always cross-check fitment with Mitsubishi parts catalogue or VIN-based lookup at ordering.

Difficulty: Easy. Estimated time: 30–45 minutes. Always inspect and address underlying vacuum leaks BEFORE replacing IAC valve — vacuum leak masquerades as IAC fault and will return immediately after IAC replacement if not resolved.

1. 1
   Disconnect battery negative terminal for 30 seconds before commencing work — resets ECU adaptive memory and clears any temporary fault codes. On some Mitsubishi applications this also resets the IAC step count to default, easing the adaptation process for the new valve.
2. 2
   Locate IAC valve on throttle body — typically mounted on side or back of throttle body housing, retained by 2-3 small bolts (typically M5 / M6). Wiring connector is a 4-pin Mitsubishi standard connector.
3. 3
   Disconnect wiring connector — press release tab + pull connector body straight off. Inspect connector for corrosion, oil contamination, or damaged pins.
4. 4
   Remove mounting bolts retaining IAC valve to throttle body. Note bolt length / position for refitting (if mixed lengths used). Carefully extract IAC valve from throttle body bore with gentle rocking motion.
5. 5
   Inspect throttle body bypass passage for carbon deposits — clean with throttle body cleaner spray and lint-free cloth. Do NOT use abrasive brushes on aluminium throttle body bore — scratches damage sealing surface.
6. 6
   Inspect O-ring / gasket sealing surface — replace O-ring or gasket with new (often supplied with new IAC valve, or separately). Reusing old hardened O-ring produces vacuum leak that immediately reproduces idle symptoms.
7. 7
   Compare new IAC to old — verify dimensions, mounting hole pattern, pintle position, connector pinout match exactly. Confirm OEM 1450A132 or verified cross-reference from supersession list. Pintle position should be similar to old part at rest.
8. 8
   Install new IAC valve with new O-ring or gasket lightly lubricated with clean engine oil or silicone grease for sealing surface lubrication. Push IAC body fully into throttle body bore until flange seats flush.
9. 9
   Torque mounting bolts to Mitsubishi specification (typically 3-5 Nm) using calibrated torque screwdriver. Over-torque can crack IAC valve aluminium body or strip threads in throttle body.
10. 10
    Reconnect wiring connector with positive click engagement. Visually verify connector seal lip seats around mating connector housing.
11. 11
    Reconnect battery. Start engine WITHOUT touching accelerator pedal — let ECU run IAC self-adaptation procedure. Engine may idle erratically for first 30-60 seconds while ECU finds the new IAC's step count vs airflow relationship; this is normal.
12. 12
    Allow engine to idle for 5-10 minutes without throttle input, then test drive verifying: stable warm idle (typically 650-850 RPM), no stall at A/C engagement or transmission shift to Drive, no surge or hunting at idle. Clear stored DTCs with OBD-II scanner if fault codes remain.