Parts for your 2001 Nissan Serena-Throttle position sensors

2001 Nissan Serena throttle position sensor (TPS): what it is, where it fits, and how to look after it

Based on the Nissan Serena C24 service manuals (Engine Control, EC), Nissan FAST/ELPA parts catalogue listings, and common diagnostic references (Autodata/AllData), the 2001 Nissan Serena petrol variants (SR20DE early C24 and QR20DE) are fitted with a throttle position sensor. On QR20DE models it’s built into the electronic throttle body (dual-track TPS with a throttle control motor). On the YD22DDTi diesel, there isn’t a conventional TPS used to interpret the driver’s throttle demand, instead it uses an accelerator pedal position sensor and an electronically controlled intake shut-off/throttle valve with its own position feedback for EGR and shutdown. So, for petrol Serenas, TPS is definitely relevant, for the diesel, a “TPS” isn’t a routine service item in the same sense.

For owners of petrol-powered 2001 Nissan Serena models, the TPS is a key part of how the engine management decides fuel and spark. It tells the ECU exactly how far the throttle plate is open, so the car responds smoothly when the driver puts their foot down. On QR20DE models the TPS is integrated into the throttle body and works alongside a throttle motor, while SR20DE versions use a cable throttle with a bolt-on TPS.

As part of routine servicing, it’s smart to keep the throttle body clean and check TPS operation with a scan tool. Tell-tales of a grumpy TPS include uneven idle, flat spots, hunting revs, poor kick-down, or the MIL glowing with codes like P0120–P0123. A dirty or sticky throttle plate can make the sensor readings look off, so a careful clean of the throttle bore and plate can help. If cleaning doesn’t sort it, testing the sensor values (looking for smooth percentage change and no drop-outs) will confirm if replacement’s on the cards.

Replacement advice varies by engine:

• QR20DE: The TPS is part of the throttle body. Replacement usually means swapping the whole assembly, then performing an idle air volume learn/throttle relearn using a scan tool or the specified manual procedure in the EC section of the Nissan manual.
• SR20DE: The TPS can be replaced separately. Mark the original position, fit the new unit, and adjust to the specified voltage/angle at closed throttle. A basic relearn or short drive cycle often tidies up the idle.

Good workshop practice includes checking the 5 V reference and ground, confirming solid connector fitment under the bonnet, and scanning live data after any work. With a healthy TPS, the Serena will feel crisper off the line and more economical around town.

Where is the TPS on a 2001 Nissan Serena?

On QR20DE petrol models it’s built into the electronic throttle body on the intake manifold. On SR20DE petrol models it’s a small black sensor bolted to the side of the throttle body opposite the cable pulley. Diesel YD22DDTi models don’t use a conventional TPS for driver demand, they rely on the accelerator pedal position sensor.

What are common symptoms of a failing TPS on a Serena C24?

Drivers may notice hesitation, flat spots, erratic idle, higher fuel use, or an engine light with TPS-related codes. Live data will often show jumpy or inconsistent throttle angle. Cleaning the throttle body can help, but persistent issues point to sensor or wiring faults.

Can the TPS be cleaned or does it need replacement?

The sensor itself isn’t serviceable. Cleaning the throttle body can improve readings if the plate is sticking. If the TPS shows dead spots or out-of-range signals, replace it. On QR20DE that typically means a complete throttle body, on SR20DE the TPS can be swapped and adjusted.