Parts for your 2000 Nissan Pulsar-Temperature sensors

2000 Nissan Pulsar temperature-sensors: what they do and how to look after them

Temperature sensors are absolutely used on the 2000 Nissan Pulsar. Technical references including the Nissan Pulsar N15 and early N16 Factory Service Manuals (EC and EL sections), common Autodata coverage for GA16DE, SR20DE and early QG-series engines, and Nissan parts catalogues confirm the car runs an Engine Coolant Temperature (ECT) sensor for the ECU, often a separate sender for the dash gauge on N15, plus an Intake Air Temperature (IAT) sensor (integrated in the MAF on many N15, located in the air duct on early N16).

These temperature-sensors quietly run the show. The ECT tells the ECU how hot the engine is so it can sort cold starts, fuel mixture, ignition timing and radiator fan control. On variants with a separate gauge sender, that one only feeds the cluster so the driver sees the needle where it should be. The IAT helps the ECU trim fuelling as air density changes on a scorching Aussie arvo or a chilly NZ morning.

Owners won’t find a fixed replacement interval in the manuals, instead, they’re serviced by inspection and testing. Fresh coolant and clean connectors keep them happy. If the Pulsar is hard to start when cold, runs rich, idles high, kicks the fan on too early or throws codes like P0115–P0119, the ECT is a prime suspect. A scan tool should show realistic coolant and intake air temps matching ambient on a cold engine, if not, time to test the sensor’s resistance against the FSM chart.

• Location: ECT is typically at the thermostat housing or cylinder head, the gauge sender (if separate) sits nearby. IAT is in the MAF on many N15s, or in the intake duct/airbox on early N16s.
• Replacement tips: Work on a cold engine, relieve pressure, catch coolant, and disconnect the battery. Swap the sensor with a quality part, reuse or replace the sealing washer/O-ring as specified, and don’t use thread tape unless the FSM calls for sealant. Tighten to spec, reconnect the plug, refill with the correct coolant and bleed air properly.
• Maintenance: Keep coolant fresh, ensure the radiator cap and thermostat are healthy, and treat electrical connectors with contact cleaner to prevent green crusties.

Look after the temperature-sensors and the 2000 Pulsar rewards with easier starts, better economy and steady gauge behaviour under the bonnet and on the road.

Where is the coolant temperature sensor on a 2000 Nissan Pulsar?
On most N15s it’s threaded into the thermostat housing or cylinder head on the gearbox side, near the upper radiator hose. Some cars also have a second, single-wire sender close by for the dash gauge. Early N16s place the ECT in a similar spot on the housing. Access is usually from above with the air intake snorkel moved aside.

If unsure, follow the upper radiator hose to the housing and look for a two‑pin connector (ECT) and, where fitted, a single‑pin sender (gauge). Always check the specific engine code before ordering parts.

What are the signs of a failing coolant temperature sensor?
Cold-start richness, rough idle, poor fuel economy, black smoke, radiator fan running constantly or not at all, and a dead or jumpy temp gauge (if the gauge sender is the issue). The check engine light may show ECT-related codes and the scan tool may report implausible temperature readings.

Because these symptoms overlap with thermostat or wiring faults, testing with a multimeter and live data is the smart first step.

Do the Pulsar’s dash gauge and ECU use the same sensor?
On many N15 models they’re separate: a two‑wire ECT for the ECU and a one‑wire sender for the gauge. Early N16 models often moved to a single multi-output unit or ECU-only sensing with the cluster deriving data from the ECU. The exact setup depends on the engine and build date.

Check the wiring connector count at the thermostat housing and confirm via the relevant Factory Service Manual for the engine code.