Parts for your 2000 Mazda Premacy-Throttle position sensors

2000 Mazda Premacy throttle position sensor (TPS)

Based on Mazda technical literature and parts data, the 2000 Mazda Premacy petrol models (FP/FS family engines) are fitted with a throttle position sensor mounted on the throttle body. References: Mazda Premacy (CP) Workshop Manual, Engine Control System (1999–2001), Mazda 323/Protegé (BJ) Workshop Manual for FP/FS engines, Mazda Electronic Parts Catalogue (EPC) listings for CP Premacy throttle body/TP sensor, Autodata/Autoinfo NZ sensor lists for 2000 Premacy petrol showing “Throttle Position (TP) sensor”. Note: the 2.0 DI RF diesel variant uses an accelerator pedal position (APP) sensor and does not employ a traditional throttle plate/TPS, so TPS relevance applies to the petrol versions.

On the petrol 2000 Premacy, the TPS tells the engine computer exactly how far the driver has opened the throttle. That live signal helps the ECU juggle fuelling, ignition timing and automatic transmission shift timing, keeping take-off crisp and cruising smooth. When the TPS wears or its connector gets grimy, the car can feel flat, surge, hesitate off the line or light the check engine lamp.

As part of regular servicing, it’s worth giving the TPS and its wiring a once-over. Under the bonnet, follow the intake to the throttle body, the TPS is the small sensor on the side where the throttle shaft runs. Check the plug for broken locks, green corrosion, or oil ingress. A quick contact clean and refit can prevent niggly intermittent faults. If you’ve got a scan tool, look at the live “TP%” or “TP voltage” – it should move smoothly from closed throttle to wide open without drop-outs. Any dead spots or jumps point to a tired sensor.

Replacement is straightforward for most DIYers: disconnect the battery, unplug the sensor, remove the mounting screws, fit the new unit and reconnect. Some Mazda cable-throttle setups allow minor TPS adjustment, set it to the workshop spec for closed-throttle voltage (your manual or data service will list it) and avoid over-tightening the screws. After replacement, perform an idle learn/reset with a scan tool if available, or follow the factory idle relearn procedure so the ECU can settle trims. Budget an hour of labour and choose a quality OEM-equivalent sensor to avoid repeat issues. For Aussie and Kiwi conditions with plenty of stop–start and heat, a quick TPS and throttle-body check at every major service keeps response tidy and fuel use in check.

• Common signs of a failing TPS: sluggish throttle, hunting idle, harsh or late shifts (auto), poor economy, stored DTCs such as P0120–P0123.
• Good practice: inspect the connector each service, keep the throttle body clean, and verify smooth sensor signal with a scan tool or multimeter.

FAQ: Where is the TPS on a 2000 Premacy and how do you check it?

It’s bolted to the side of the throttle body on petrol models, opposite the throttle cable linkage. With a scan tool, watch TP% or voltage while slowly opening the throttle, it should rise smoothly. No scan tool? A multimeter back-probe on the signal wire can show the same smooth sweep. Any flat spots or spikes signal a worn sensor.

FAQ: Do you need to calibrate or relearn the TPS after replacement?

Many Premacy petrol variants will idle fine after a battery-off swap, but best practice is to perform an idle learn with a scan tool and ensure the closed-throttle value is within the workshop spec. If the sensor is slotted, a tiny adjustment may be needed to set the closed-throttle reading correctly.

FAQ: What symptoms point to a bad TPS on a 2000 Premacy?

Typical clues are hesitation on take-off, surging at steady throttle, hunting idle, higher fuel use, and a check engine light with TP-related codes. Autos may shift harshly or at odd points because the ECU can’t see correct throttle angle.