Parts for your 2002 Daihatsu Gran move-Throttle position sensors

2002 Daihatsu Gran Move throttle position sensor (TPS): what it does and how to look after it

Technical sources confirm the 2002 Daihatsu Gran Move is fitted with a throttle position sensor. The Daihatsu Gran Move/Pyzar G300/G303 Workshop Manual (EFI section), Daihatsu’s Electronic Parts Catalogue for the 2002 model year, and Autodata Technical Data for Daihatsu models all show a Denso-type TPS mounted on the throttle body, providing throttle angle and idle switch signals to the ECU. So, yes—this part is relevant and used on the 2002 Gran Move.

On a 2002 Gran Move, the TPS is the ECU’s eyes on the throttle blade. As the driver presses the pedal, the sensor reports throttle angle so the ECU can deliver the right fuel and spark. It smooths tip-in, trims fuel on overrun, and helps with idle stability. On autos, TPS input can also influence shift behaviour. Because the Gran Move uses a cable-operated throttle body, this is a simple, serviceable Denso-style potentiometer with an integrated idle switch.

As part of regular servicing, it’s worth giving the TPS some attention under the bonnet:

• Visual check: make sure the connector is snug, pins aren’t green with corrosion, and the harness isn’t chafed.
• Throttle body clean: a light clean of the bore and plate can fix sticky idle, but avoid flooding the TPS with cleaner—it’s sealed, not a dunk-and-soak item.
• Basic testing: with a scan tool, look for a steady closed-throttle reading and a smooth rise to wide-open throttle. With a multimeter, you’re chasing a clean, linear sweep—no dead spots.

Common clues the TPS is on the way out include a hunting idle, flat spots off the line, surging at cruise, rough gear changes on autos, higher fuel use, or an engine light with codes like P0120–P0123. If replacement’s on the cards, it’s a spanner-friendly job: disconnect the battery, unplug, mark the original sensor position, swap it over, then align it so the ECU sees “closed throttle” correctly. Many units have slotted holes for minor adjustment—set it using live data so idle switch status and throttle percentage look right, then clear codes and let the engine warm up for an idle relearn.

Quality matters here—go for a reputable brand that matches the Denso-spec plug and profile. With a good sensor and a clean throttle body, the little Daihatsu drives far nicer, uses less petrol, and behaves itself in stop–start traffic, whether it’s doing school runs or weekend kilometres around town.

Where is the TPS on a 2002 Daihatsu Gran Move?

It’s bolted to the side of the throttle body, opposite the cable quadrant, sitting on the end of the throttle shaft. You’ll spot a small, black plastic housing with a three- or four-pin Denso-style connector pointing outwards.

The unit turns with the throttle shaft and reports angle to the ECU. Access is straightforward once the intake hose is off.

What are the signs the TPS is failing on a Gran Move?

Typical signs are a jerky tip-in, hesitation, a wandering idle, harsh or late shifts on autos, and higher fuel consumption. The check engine light may log P0120–P0123 or related throttle correlation faults.

Always rule out vacuum leaks and a dirty throttle plate first—both can mimic TPS symptoms.

Can the TPS be cleaned, or does it need replacing?

The TPS itself is sealed and not designed for internal cleaning. If the connector is oxidised, a careful terminal clean can help, and cleaning the throttle body often improves drivability. If the sensor has dead spots or won’t hold a stable idle switch signal, replacement is the reliable fix.