Parts for your 2002 Mazda Premacy-Throttle position sensors

2002 Mazda Premacy Throttle Position Sensor (TPS)

Yes, the 2002 Mazda Premacy is fitted with a throttle position sensor. Technical references including the Mazda Premacy (CP) factory workshop manual for FP-DE/FS-DE petrol engines, Mazda’s Electronic Parts Catalogue, and service data from Autodata/AllData all show a three‑wire TPS mounted on the throttle body, providing the ECU with throttle angle information and appearing in wiring diagrams and DTC lists (P0120–P0123 range). So, for servicing and diagnostics on a 2002 Premacy, the TPS is absolutely relevant.

The TPS tells the engine computer how far the throttle is open. That signal is used to fine‑tune fuel delivery and ignition timing, manage idle speed control, and on auto models, influence shift timing. A healthy TPS helps the Premacy feel smooth off the line, prevents flat spots, and keeps fuel economy on point.

Common signs the TPS is on the way out include hesitation, a hunting or high idle, sudden surges, poor fuel use, harsh or odd shifts (auto), and a check engine light. Typical fault codes include P0120, P0121, P0122, and P0123. Because these symptoms overlap with vacuum leaks and a dirty throttle body, it’s smart to check the basics first.

As part of regular servicing, the TPS doesn’t have a set replacement interval, but it pays to:

• Clean the throttle body and butterfly every 20,000–30,000 km.
• Inspect the TPS connector for corrosion, broken tabs, or loose pins.
• Verify the 5 V reference, good ground, and smooth signal sweep (about ~0.5 V closed to ~4.5 V wide open) with a multimeter or scan tool.

When replacement is needed, the TPS on the Premacy sits on the throttle body, typically held by two screws. Disconnect the battery, unplug the connector, and remove the screws. Align the new sensor’s tang with the throttle shaft—don’t force it—then nip the screws up evenly. Many units are non‑adjustable, if the mounting is slotted, set closed‑throttle voltage close to spec (often around 0.5–0.7 V) with a scan tool or meter. Reconnect, clear codes, and perform an idle relearn: warm the engine, let it idle with all accessories off for a few minutes, then take a short drive with gentle acceleration so the ECU trims settle. A quick road test should confirm clean tip‑in, steady idle, and smooth shifting.

Popular questions about 2002 Mazda Premacy throttle position sensors

Does a 2002 Mazda Premacy have a TPS, and where is it?
Yes. It’s mounted on the throttle body, connected to the throttle shaft. Look for a small black sensor with a three‑pin plug on the side of the throttle housing.

What are the tell‑tale signs the TPS is failing?
Hesitation off idle, flat spots, erratic or high idle, poor fuel economy, abrupt auto shifts, and a check engine light with codes like P0120–P0123. A scan tool live‑data check of throttle angle is a quick way to confirm.

Can the TPS be cleaned, or does it need replacing?
The sensor itself isn’t serviceable, if it’s electrically faulty or has dead spots, replace it. Cleaning the throttle body and ensuring a clean, tight connector can fix issues that look like TPS faults.