Parts for your 1990 Nissan Primera-Crank angle sensor

1990 Nissan Primera crank-angle sensor: what it is, where it lives, and how to look after it

Yes, the 1990 Nissan Primera uses a crank-angle sensor. Nissan’s own P10 Factory Service Manual (EC section) and period Haynes coverage describe it as an optical Crank Angle Sensor integrated inside the distributor on the GA16 and SR-series petrol engines. Nissan often labels it “CAS” and, although it’s driven off the cam, it provides both engine speed and position signals the ECU needs for spark and fuel.

The crank-angle sensor’s job is to tell the ECU exactly where the engine is in its rotation, so ignition timing and injector sequencing land bang-on. Without a clean signal, the Primera can be hard to start, misfire, stumble under load, or cut out. On OBD1 Nissans, a failed CAS commonly logs ECM code 11. Because the sensor sits in the distributor under the cap and rotor, it’s exposed to heat, oil vapour, and the odd bit of moisture under the bonnet, so a little preventive care goes a long way.

There’s no set replacement interval, but it’s smart to inspect the distributor and CAS during regular servicing, especially if the car’s showing its age or higher kilometres. Keep the cap and rotor in good nick, check the CAS connector and loom for brittle insulation, and make sure the distributor’s O-ring isn’t weeping oil inside. If you’re chasing intermittent cut-outs or a no-start with weak or no spark, test for a CAS signal before throwing coils and plugs at it. Many owners choose to replace the entire distributor assembly when the CAS plays up, as it’s quick and reliably fixes worn internal bearings and seals at the same time.

Replacement tips for the home spannerer: disconnect the battery, mark the distributor’s position relative to the head before loosening the hold-down bolts, and avoid spinning the shaft with the key on. If swapping the internal sensor only, work cleanly—dust on the optical disc can upset the signal. After refit, set base ignition timing with a timing light following the FSM procedure (consult mode or timing check mode) and use the factory spec for the exact engine. Quality parts matter here, a flaky pattern sensor can have the ECU guessing, so stick with a reputable brand. If in doubt, a trusted auto sparky can scope the signal and confirm the fix.

• Typical symptoms: no-start, sudden stall, erratic tacho, misfires, ECM code 11.
• Best practice: inspect at service time, keep moisture out, verify timing after any distributor work.
• Preferred repair: replace the whole distributor if the CAS has failed and the housing is worn.

Popular questions

Where is the crank-angle sensor on a 1990 Nissan Primera?
It’s built into the distributor on the end of the camshaft. Pop the distributor cap off and you’ll find the optical sensor assembly under the rotor. Nissan labels the distributor-mounted unit “Crank Angle Sensor (CAS)” in the P10 FSM.

What are the common signs the CAS is failing?
Hard starting or a dead no-start with no spark, random stalling once warm, misfires at cruise, and an ECM code 11 are the usual giveaways. An erratic or dead tachometer during cranking is another clue because the tacho follows the CAS signal.

Can they be cleaned, or do they need replacing?
Light cleaning of dust on the optical disc and checking the connector can revive a borderline sensor, but if the car still cuts out or throws code 11, replacement is the reliable fix. Many owners fit a complete distributor to address sensor, bearing and seal wear in one go.