Parts for your 1998 Nissan Pulsar-Throttle position sensors

1998 Nissan Pulsar Throttle Position Sensor (TPS)

Based on technical references for the N15-series Pulsar (1995–2000), the 1998 Nissan Pulsar is fitted with a throttle position sensor. The Nissan Pulsar/Almera N15 Factory Service Manual (EF&,EC section) details the TPS mounted on the throttle body for GA16DE and SR20DE engines and includes diagnostic procedures and DTCs for TPS circuits (e.g., P0120–P0123). Comparable coverage appears in Nissan Sentra B14 service literature for the same engine families and in aftermarket workshop data sets commonly used by Australian and New Zealand workshops. So, the throttle position sensor is absolutely relevant on a 1998 Pulsar.

On a 1998 Nissan Pulsar, the throttle position sensor (TPS) tells the engine control unit exactly how far the throttle is open. That live signal helps the ECU fine-tune fuelling, ignition timing, and automatic-transmission shift strategy. The result is crisp throttle response, smoother idle, and better fuel economy around town and on the open road.

For owners maintaining their 1998 Pulsar, the TPS isn’t a routine “replace at X km” item, but it is worth inspecting during regular servicing, especially as kilometres climb and under-bonnet heat and age take their toll. A healthy TPS should sweep smoothly from a low voltage at closed throttle to a higher voltage at wide open, with no dead spots or spikes. On many Nissans of this era, the sensor has slotted mounting holes so it can be adjusted to spec after fitment.

• Common signs of a tired TPS: erratic or high idle, flat spots on take-off, surge on light throttle, harsh or late shifts in autos, poorer fuel use, and a check engine light (often logging codes like P0120–P0123).
• Basic servicing tips: check the connector and wiring for corrosion or broken insulation, clean the plug with contact cleaner, ensure the throttle plate moves freely (no carbon sticking), and verify the sensor output with a scan tool or multimeter.
• Replacement pointers: disconnect the battery, mark the old sensor’s position, swap the unit, then rotate it slightly to set base position. Tighten the screws evenly—no need to heave on the spanner for these small fasteners. Finish with a code clear and, where applicable, an idle/throttle learn procedure using a scan tool or the manual timing method from the service manual.

Because many drivability complaints mimic TPS faults, it pays to rule out vacuum leaks, a dirty throttle body, or a failing mass airflow sensor before throwing parts at the problem. A quality OEM-equivalent TPS, correctly adjusted, restores proper throttle behaviour and keeps the Pulsar feeling perky and predictable across Aussie and Kiwi roads.

Where is the TPS on a 1998 Pulsar?

It’s bolted to the side of the throttle body, on the end of the throttle shaft. Expect a small, black plastic sensor with two retaining screws and a 3-pin connector. This applies to common N15 engines like the GA16DE and SR20DE.

Does a new TPS need calibration or adjustment?

Yes. After installation, the TPS should be set so the ECU sees the correct closed-throttle signal and a smooth sweep to wide open. A scan tool reading near 0–1% at closed throttle (and ~100% at wide open) is a handy guide, or follow the voltage/continuity specs in the factory manual.

Which fault codes point to a TPS issue?

Typical codes include P0120, P0121, P0122, and P0123. These indicate circuit range/performance, low, or high input faults. Codes alongside drivability symptoms are a good nudge to test the TPS and its wiring.