Parts for your 2004 Nissan Serena-Throttle position sensors

2004 Nissan Serena throttle position sensor (TPS) — what it does and when to service it

Based on the Nissan C24 Serena Factory Service Manual (EC section for QR20DE/QR25DE and YD22DDTi) and standard Nissan DTC coverage (P0120–P0124, P2135), the 2004 Nissan Serena is fitted with throttle position sensors. They’re built into the electronic throttle body alongside the throttle control motor, with dual TPS tracks for redundancy. The accelerator pedal uses a separate accelerator pedal position (APP) sensor.

On this Serena, the TPS tells the engine control module how far the throttle plate is open. That signal helps the ECU manage fuelling, ignition timing, idle speed control, cruise control behaviour, and even gearshift quality on auto/CVT variants. Because it’s drive‑by‑wire, the ECU commands a motor to move the throttle plate and relies on the two TPS signals to verify the plate actually went where it was told. If the two signals disagree, it’ll throw a code and may drop into limp mode to protect the drivetrain.

Worth noting for owners: on the 2004 Serena the TPS isn’t a separate bolt‑on widget, it’s integrated into the throttle body. If the TPS fails testing per the FSM, the usual repair is replacement of the complete throttle body assembly.

• Common signs of a TPS/throttle body issue: erratic idle or stalling, flat spots on take‑off, poor fuel economy, cruise disengaging, harsh or early shifts, and the check engine light (often with codes like P0120–P0124 or P2135).
• Basic care: keep the throttle body and its connector clean and dry, and avoid spraying aggressive cleaners that can wick into the shaft bearings or sensor.

Servicing tips for a 2004 Serena:

• Cleaning: Use throttle‑body safe cleaner and a lint‑free cloth under the bonnet. Don’t force the butterfly open by hand on electronic throttles, key ON and have a helper press the pedal if movement is needed.
• After any cleaning, battery disconnection, or throttle body replacement, perform Throttle Valve Closed Position Learning and Idle Air Volume Learning (as outlined in the Nissan FSM or with a capable scan tool). Skipping this can cause hunting idle or stalling.
• Replacement: Fit a new gasket, torque the throttle body to factory spec, check the 5 V reference, ground, and signal wiring for damage or water ingress, then complete the learn procedures and clear codes. Use quality OEM‑equivalent parts to maintain reliability.

With the right care and proper relearns, the Serena’s TPS/throttle body setup gives smooth drivability and dependable starts across Aussie and Kiwi conditions.

Popular questions about 2004 Nissan Serena throttle position sensors

Does the 2004 Serena have both a pedal sensor and a throttle position sensor?
The 2004 Serena uses two systems: an accelerator pedal position (APP) sensor on the pedal and dual throttle position sensors inside the electronic throttle body. The ECU cross‑checks them for accuracy. The TPS isn’t serviced separately, it’s part of the throttle body.

Do I need to recalibrate the throttle after cleaning or disconnecting the battery?
Yes. Perform Throttle Valve Closed Position Learning and Idle Air Volume Learning after cleaning, battery disconnection, or throttle body replacement. Without these, the idle may surge, stall, or sit too high. A proper scan tool makes this quick and reliable.

How often should the TPS be replaced on a 2004 Serena?
There’s no set interval. It’s replaced only if faulty based on diagnostic testing. Periodic throttle body cleaning and checking wiring/connectors during regular servicing helps prevent issues and keeps throttle response crisp.