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LH 2.4 900

posted by  spook on  Thu Sep 1 02:37 CST 2022
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear B.B.,

Hope you're well and stay so! A "film" of corrosion only a few molecules thick - and so invisible to the unaided eye - can disrupt a circuit. Thus, the sudden onset of symptoms reflects the completion of a corrosion "barrier". It is akin to a faucet being shut: as the handle is turned, the flow of water diminishes and then stops completely.

Removing and re-connecting the Crank Position Sensor (CPS) may break-through the corrosion barrier and restore operation.

Because CPS removal/replacement is tedious, most - who replace a CPS and so restore smooth operation - do not re-install the in-service unit, to see if it has failed internally, or if failure was caused by corrosion.

Your test indicates the CPS itself is OK. The resistance in coil should read 170Ω±30 (Volvo pocket data booklet - Cars 𖘴, 900, S90, V90 ...] 1991-1998, p. 42.)

Hope this helps.

Yours faithfully,

Spook






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