Parts for your 1993 Mitsubishi Pajero-Throttle position sensors

1993 Mitsubishi Pajero Throttle Position Sensor (TPS) — What it does and how to look after it

Based on Mitsubishi’s factory service information for the 1991–1996 Pajero/Montero (Engine Electrical/Fuel Injection and Automatic Transmission sections) and the Mitsubishi ASA/CAPS parts catalogue, the 1993 Mitsubishi Pajero is fitted with a throttle position sensor. Petrol EFI models (e.g., 6G72 V6) use a TPS mounted on the throttle body, and many diesel variants (4D56/4M40 with Zexel/VE-type pumps) use a throttle/accelerator position sensor on the pump/throttle lever for engine management, EGR and auto trans control. The auto trans control systems of the era (e.g., V4AW3) also reference TPS input as documented in the transmission section of the FSM. So, yes — a TPS is relevant and used on 1993 Pajero models.

The TPS tells the engine control unit how far the throttle is open. That single signal helps the ECU and, where fitted, the transmission control unit decide fuelling, spark timing, idle speed trim, shift timing and converter lock-up. When it’s healthy, throttle response feels crisp, shifts are on time, and fuel economy stays on point.

Typical signs a TPS is on the way out include: erratic idle, flat spots on take-off, surging when cruising, harsh or late shifts in autos, higher than usual fuel use, and a check engine light. On diesels with a pump-mounted sensor, you might also notice awkward shift behaviour and EGR faults.

Service-wise, it’s a simple bit of kit but worth checking as part of routine maintenance:

• Inspect and clean the connector under the bonnet — dust and moisture are common culprits. A quick spray of contact cleaner can save a lot of headaches.
• Test the sensor with a multimeter or scan tool. You’re looking for a smooth voltage change from closed to open throttle with no drop-outs. The FSM gives the pinout and expected ranges for your engine code.
• If replacing, mark the old sensor’s position, swap it over, and rotate the new unit slightly to set base voltage per spec. Lightly snug the mounting screws — they’re small and don’t need gorilla torque.
• After fitment, perform idle learn or ECU reset procedures outlined in the workshop manual, then road test for clean throttle response and tidy shift timing.

Because part numbers and procedures vary by engine (6G72 petrol vs 4D56/4M40 diesel), it’s smart to match by VIN/engine code and follow the factory adjustment steps. Look after the TPS and the Pajero drives the way it should — smooth, torquey and drama-free.

FAQs

Where is the TPS on a 1993 Pajero?
On petrol EFI models, it’s bolted to the side of the throttle body with a three-wire plug. On many diesels, a similar position sensor sits on the injection pump’s throttle/lever assembly, connected to the harness and linkage. Look for a small, black plastic sensor with an oval connector.

What are the symptoms of a failing TPS on this model?
Hesitation off idle, surging, inconsistent idle, higher fuel use, and on autos, clunky or late shifts. A scan tool may show erratic throttle angle, while a multimeter can reveal a voltage “dead spot” as the throttle is opened.

Can it be cleaned or should it be replaced?
The sensor itself isn’t serviceable, but cleaning the plug and checking the earths often helps. If the voltage sweep isn’t smooth or the idle switch function (where separate) is out, replacement and a quick re-adjust generally sorts it.