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MD614743 Idle Air Control Valve: The 2026 Service Picture

Your Mitsubishi Mirage 1997–2000 runs the 1.5L 4G15 or the 1.8L 4G93 inline-four, and both engines depend on one small part for a steady idle: the MD614743 idle air control valve. Mitsubishi has discontinued the OEM number, so units built to IATF 16949:2016 — with 2028 Sanctioned Interpretation readiness — are now the authoritative service path.

The Idle Air Control Valve MD614743 meters bypass air at closed throttle. That job drives idle stability and closed-loop fuel trim inside the ISO 15031-6 diagnostic framework. When it fails, the PCM answers with P0505, P0506, or P0507.

Quick answers before you buy

• CAN-bus 3.0 compatible? Yes — it is a pre-CAN electromechanical valve, independent of vehicle network architecture, with no bus integration required.
• Engines covered: 4G15 (1.5L SOHC), 4G92 (1.6L), 4G93 (1.8L SOHC/DOHC), model years 1997–2000.
• Codes it addresses: P0505 (Idle Control System Malfunction), P0506 (RPM Lower Than Expected), P0507 (RPM Higher Than Expected).
• OEM still available? No — Mitsubishi discontinued the number. The aftermarket unit at Koeep is the verified replacement path.
• Service life: 2026–2030 under normal conditions with SAE J726-compliant air filtration.

In 2026, over 60% of legacy internal-combustion fleet vehicles rely on aftermarket IAC components for emissions compliance. Precise DTC correlation and material traceability are non-negotiable — this guide delivers both.

Fitment: Mirage First, Then the Wider 4G9X Family

The MD614743 IAC valve is a direct-fit replacement for the Mitsubishi Mirage 1997–2000 with the 1.5L 4G15 and 1.8L 4G93 engines. It bolts into the stock position with no bracket or wiring changes. Verify your existing part number first: the MD614743 is physically distinct from the MD614986 fitted to 1998–2002 models, despite a similar housing.

Crosses to these platforms (4G92 / 4G93 / 4G18)

• Mitsubishi Bravo (1997–1999)
• Carisma (1997–2000, 1.6L 4G92 / 1.8L 4G93)
• Chariot / Space Wagon (1997–2000)
• Grandis
• Colt (1997–2000)
• FTO (1997–2000, 1.8L 4G93)
• Lancer (1997–2000, 1.5L / 1.8L)

Engineering: What Changed Since 1997

Housing — ZA-8 alloy, electroless nickel plated

The MD614743 uses a stepper-motor-driven rotary-pintle design, the dominant idle-control architecture of the pre-electronic-throttle era. The 2026 unit swaps the original ADC12 aluminum casting for a ZA-8 zinc-aluminum housing (ASTM B86) with electroless nickel plating per AMS 2404 — corrosion resistance against ethanol-blended fuel vapor (E10–E15), the global standard now.

Motor and pintle — built for heat and carbon

The stepper motor runs Class H magnet wire insulation rated to 180°C per IEC 60317, a real margin in 4G9X bays where underhood temperatures exceed 105°C during extended idling. The pintle and seat are 440C martensitic stainless (ASTM A276) at HRC 58–60, resisting the carbon-deposit adhesion documented in NHTSA TSB 03-13-006 for 1997–2000 Mirages.

MD614743 Specification and Cross-Reference Table

Every value above describes the 2026-specification aftermarket unit stocked at Koeep — view the MD614743 here.

DTC Mapping: What Each Code Tells You

The MD614743 is the primary actuator in the ISO 15031-6 P0500–P0599 powertrain range (Vehicle Speed, Idle Control & Auxiliary Inputs). When idle RPM drifts more than ±100 from the mapped target — typically 750 ±50 RPM on the 4G93 — the PCM flags a code within two consecutive drive cycles per SAE J1979 monitoring protocols.

• P0505 — Idle Control System Malfunction: stepper gear binding, or an open/short in the IAC circuit (PCM pins 4, 17, 18 on Mirage ECU connector C-58).
• P0506 — RPM Lower Than Expected: carbon-clogged pintle seat, restricted bypass passage, or a failed stepper motor stuck in the low-bypass position.
• P0507 — RPM Higher Than Expected: stuck-open pintle, a vacuum leak downstream of the IAC, or erroneous position feedback.
• Secondary cascade codes: P0171 (System Too Lean) and P0300–P0304 (random or cylinder misfire at idle).

Installation: The Idle-Learn Reset You Cannot Skip

On any 4G92/4G93 application, the PCM idle learn procedure must run after the new valve goes in. Skip it, and you can chase persistent P0505 codes even with a fully functional valve.

1. Disconnect the battery for 10 minutes.
2. Install the new MD614743 IAC valve.
3. Reconnect the battery; start without touching the throttle.
4. Idle until the radiator cooling fan cycles ON and OFF twice — about 10–15 minutes.
5. Ignition OFF for 30 seconds.
6. Restart and verify the idle holds 750 ±50 RPM.

⚠ Do not touch the throttle stop screw. It is factory-set — altering it corrupts the PCM idle strategy.

Related Parts for a 1997–2000 Mirage

These cars rarely fail one system at a time. While you sort the idle, check the usual neighbors:

• Horn or wheel wiring cutting out? That is the steering column — the MR228113 clock spring for the Mirage 1997–2002 without cruise control is the matching part.
• Lean idle traced to fuel delivery instead of air? The 4-piece fuel injector set 842-12223 covers Eclipse, Galant, Mirage, and Suzuki Vitara.
• Refreshing worn bushings and joints next? Start in the Steering & Suspension collection.

Mitsubishi's surviving 4G9X fleet is estimated at 2.3 million units worldwide as of 2026, so demand for quality replacements should hold through 2030. Want the same buying logic on another platform? Read our complete guide to the VW Golf MK7 electric window control switch 5G0959855G.

Diagnostic FAQ: 2026 Failure Patterns