Parts for your 2002 Mitsubishi Pajero-Throttle position sensors

2002 Mitsubishi Pajero throttle position sensor (TPS) — what it does and when to replace it

Technical sources confirm that a throttle position sensor is used on the 2002 Mitsubishi Pajero petrol variants, but a conventional TPS is not fitted to the diesel models. The Mitsubishi Pajero NM/NP Factory Service Manual (Engine: Fuel and Emission Control, Engine Electrical), Mitsubishi’s ASA electronic parts catalogue, and mainstream aftermarket catalogues (e.g., NTK/NGK, Delphi) all list a TPS on the 3.5‑litre 6G74 petrol engines. For the 3.2 DI‑D 4M41 diesel, there’s no traditional TPS for fuelling, instead, it uses an accelerator pedal position sensor and a throttle valve actuator with an internal position sensor primarily for EGR control and smooth shutdown. So, for petrol Pajeros the TPS is absolutely relevant, for diesels, the “TPS” listing typically doesn’t apply in the same way.

On the 2002 Pajero petrol, the TPS sits on the throttle body and tells the ECU exactly how far and how fast the throttle is opening. That live signal helps the ECU manage fuelling and ignition timing, smooths out tip‑in off idle, fine‑tunes idle control, and even influences auto transmission shift quality and cruise control behaviour. When it’s healthy, throttle response feels crisp and predictable, when it’s unhappy, you can get flat spots, surging, erratic idle, harsh shifts, higher fuel use, and a check‑engine light (often codes like P0120–P0123).

There’s no set replacement interval for a TPS, but it’s wise to inspect it during major services (every 100,000 km or when drivability issues pop up). Quick checks include scanning live data for a smooth throttle angle sweep from closed to wide‑open, and verifying the output voltage rises steadily without dropouts. Any dead spots, spikes, or a value that won’t settle at closed throttle point to a worn sensor or a misadjusted mounting.

Replacement on a 6G74 is straightforward with basic hand tools. After disconnecting the battery and the connector, the sensor usually comes off with two screws. Some units have slotted holes for adjustment, refit and set it to the spec in the factory manual using a scan tool or a multimeter, then perform an idle learn procedure if required. Don’t touch the throttle stop screw. While you’re under the bonnet, clean the throttle body, check for vacuum leaks, and make sure the TPS connector is clean and tight—use proper electrical contact cleaner, not WD‑40.

Stick with quality OEM or reputable aftermarket sensors. A cheap, inconsistent TPS can cause more grief than the worn one you’ve just binned. If your Pajero is the diesel DI‑D, note that TPS parts won’t cure throttle‑related faults, diagnostics should target the accelerator pedal sensor or the throttle valve actuator instead.

• Common signs: hesitation off idle, hunting idle, poor kick‑down, harsh shifts, higher fuel use, MIL on.
• Tools: basic sockets/screwdrivers, multimeter or scan tool for adjustment/verification.
• Good practice: throttle body clean, connector inspection, ECU idle learn after replacement.

FAQs

Does a 2002 Pajero have a throttle position sensor?
Yes for petrol models (3.5‑litre 6G74), where the TPS is mounted on the throttle body and is used for fuelling and ignition control. The 3.2 DI‑D diesel doesn’t use a conventional TPS, it relies on an accelerator pedal position sensor and a throttle valve actuator with its own position feedback for EGR/shutdown control.

What are the symptoms of a failing TPS on a Pajero?
Drivers often notice hesitation when taking off, flat spots during gentle acceleration, erratic or high idle, harsh or delayed automatic shifts, and higher fuel consumption. A check‑engine light may appear with TPS‑related fault codes. Live data that doesn’t sweep smoothly as the pedal is pressed is a giveaway.

Does the TPS need adjustment or a relearn after replacement?
Many 6G74 TPS units are adjustable. After fitting, set closed‑throttle position to spec using a scan tool or multimeter, then perform an ECU idle/throttle learn as per the factory procedure. Skipping this step can leave the idle unstable and throttle response a bit off.