Parts for your 2012 Nissan Pulsar-Throttle position sensors

2012 Nissan Pulsar throttle-position-sensor (TPS): what it does and how to look after it

Based on Nissan’s factory service information for the 2012–2013 Pulsar/Sylphy (B17 sedan and C12 hatch, EC section – Electronic Throttle Control System), the car uses an electronic throttle body that contains a throttle control motor and two throttle position sensors (often called TPS1/TPS2). These dual sensors report the throttle plate angle to the engine control module. So yes, a TPS is fitted and is absolutely relevant to the 2012 Nissan Pulsar, it’s integrated into the throttle body rather than a standalone, cable-era part.

The TPS on a 2012 Pulsar tells the ECU exactly how far the throttle plate is open, so the car can meter fuel, time the spark, manage idle speed, cruise control and traction control, and keep emissions tidy. Because it’s a drive-by-wire setup, there are two TPS signals for redundancy. If they disagree, the ECU throws a wobbly, turns on the check engine lamp and may drop the car into limp mode to protect the engine. Typical fault codes include P0121–P0123, P0221–P0223 and P2135.

There’s no scheduled TPS replacement interval. Instead, think of it as “inspect and keep clean.” The sensor lives inside the throttle body, so the best maintenance is gentle throttle-body care:

• Don’t force the throttle plate by hand under the bonnet, use the pedal with ignition on.
• If it’s grubby or idling rough, remove the intake hose and clean the bore with throttle-body-safe cleaner and a lint-free cloth. Avoid soaking the shaft or electronics.
• Check the connector and loom for corrosion or rubbing, especially near the throttle body.
• After cleaning or a flat battery, perform a throttle/idle relearn. A scan tool makes it easy, there’s also a pedal procedure. Expect a short drive cycle for the ECU to settle.

If the TPS goes bad, it’s typically a complete throttle body replacement on these models (the sensors aren’t serviced separately). Use a new gasket, keep everything spotless, and finish with the Nissan throttle closed-position and idle air volume learn. A workshop scan tool speeds this up and avoids headaches. Signs you might be due include erratic idle, hesitation on take-off, surging at a steady speed, poor fuel economy, and the MIL glowing with the codes mentioned above. As part of routine servicing at around 100,000 km or when symptoms crop up, a quick inspection and clean can save a lot of drama.

Does the 2012 Pulsar have a TPS or just a pedal sensor?

It has both. The accelerator pedal has position sensors to tell the ECU what the driver wants, and the throttle body has dual TPS units to confirm how far the throttle plate actually opens. The ECU cross-checks them for safety.

What are common TPS symptoms and fault codes on a 2012 Pulsar?

Rough or high idle, flat spots, surging, stalling when coming to a stop, and limp-home behaviour are common. Expect codes like P0121–P0123, P0221–P0223 or P2135 if the TPS signals are out of range or don’t agree.

Can I replace or clean the TPS by itself?

No. On this model the TPS is built into the throttle body. You can clean the throttle bore to help idle quality, but if the TPS fails, the fix is replacing the entire throttle body and carrying out the relearn procedures.