Parts for your 1991 Nissan Primera-Camshaft sensor

1991 Nissan Primera camshaft sensor — what it is and how to look after it

Based on factory documentation and recognised technical guides, the 1991 Nissan Primera (P10) does use a camshaft position signal. As detailed in the Nissan Primera P10 Factory Service Manual (Engine Control and Ignition sections) and widely echoed in the Haynes Primera 1990–1999 guide and Autodata listings, that signal is generated by an optical crank angle sensor housed inside the distributor, driven by the camshaft. So while there isn’t a separate external “camshaft sensor” on most P10s, the distributor’s built‑in sensor performs the same job.

On a 1991 Primera, the camshaft signal is the brains of the show. The optical wheel and pickup inside the distributor feed the ECU with both engine speed and cylinder identification, letting it fire the injectors and ignition at just the right moment. If that signal goes walkabout, expect hard starting, random stalling, or a dead‑as‑a‑doornail no‑start. The ECU will usually store a fault (commonly logged in Nissan’s OBD1 as a crank angle/cam signal code) you can retrieve via the ECU diagnostic procedure.

Because the cam sensor is built into the distributor, maintenance is mostly about prevention and sensible checks. At service time, it’s worth:

• Inspecting the distributor cap and rotor for tracking, moisture, and carbon build‑up.
• Checking the distributor shaft for play, worn bearings can skew the optical reading.
• Looking for oil ingress from a tired distributor seal, which can fog the optical window.
• Verifying the engine earths and the distributor harness plug for corrosion or broken wires.

If faults persist, many techs replace the distributor assembly rather than the internal sensor alone, as it restores the pickup, bearings, cap/rotor, and seal in one hit. When fitting a new or reconditioned unit, mark the old distributor’s position relative to the head before removal to keep base timing close. After installation, have the base ignition timing set with a timing light to the spec shown on the under‑bonnet label or service data (the ECU needs to be placed in timing‑set mode on these cars). Fresh cap, rotor, and leads are cheap insurance if they’re due.

Common signs the camshaft signal is unhappy include:

• Intermittent misfire, surging at cruise, or a wonky tacho.
• Hot‑soak no‑start that cranks strongly but won’t catch.
• Fuel economy going pear‑shaped and a check‑engine light with a cam/crank reference code.

Treat the distributor area gently – no pressure washing, keep fluids off it, and fix oil leaks early. Do that, and the Primera’s cam signal hardware will usually go the distance for plenty of Kiwi and Aussie kilometres.

Popular questions

Does a 1991 Nissan Primera actually have a camshaft sensor?
Yes. It’s not a separate bolt‑on sensor, the camshaft position signal is generated by the optical crank angle sensor inside the distributor, which is driven by the cam. That unit provides both engine speed and cylinder ID to the ECU.

What are the symptoms of a failing camshaft signal on a P10?
You’ll often see hard starting or random stalling, a jumpy tachometer, misfires at cruise, and sometimes a hot‑no‑start after a short stop. The ECU can log a fault code for the cam/crank reference, which helps confirm the diagnosis.

Can the sensor be cleaned or does it need replacing?
If oil has crept into the distributor, cleaning may buy time, but it’s usually a sign the internal seal or bearings are tired. Most workshops replace the distributor assembly to fix the root cause and restore reliable timing and signal quality.