Schnell Gelb

Unless there is an obvious, repairable wiring fault, just replace the CPS. They do age out and tanker is correct ,the common mode of failure is when hot.

Jojo Bonett

is there anyway of obtaining ohm-meter readings of the actual sensor, in case it has any obvious wrong readings? will also need the sensor's socket pin numbers too.

Thanks

sniperonhigh

I have changed lots of CPS and CMS sensors (some due to recall campaigns) and they all act pretty much the same. Fine when cold, crazy when they warm up. Kinda like a girl you've been dating for a while...... Anyway, I would just replace it and call it PM, log when you replace it and go from there.

Jojo Bonett

thanks. Waiting for a new CPS and will let you know of the outcome, hopefully a positive one!!

Cheers

Jojo

Jojo Bonett

Ok, so I took off the old senor and noticed a small amount of iron fillings on the head of the sensor, so maybe this was part of the reason for the errors and also the fact that it wasn't revving more than 4.5K rpm. But once I took it out and had a new one, I decided to replace it anyway and now the engine is revving normally and no hesitation at all even while idling.

Macster

Thanks for the update. Glad you got it sorted.

The presence of iron/ferrous filings on the sensor suggest it was perhaps contacting the toothed ring that is part of the flywheel. Could have the old sensor been loose or disturbed?

Jojo Bonett

Hi,


when I clean the filings, the sensor was intact and did not show any form of friction on it. I could have tried the old sensor after cleaning, but to be honest did not bother and just replaced it. Of course if I've seen any direct friction on the sensor's head, I would have thought differently, but luckily this wasn't the case and seems to have been sorted. But I would have never thought that a hall IC goes bonkers when warmed up, at least in my photocopier servicing life, I've never seen this before, but as they say, there's always a first time!!


Cheers.


Jojo

extanker

a small amount of metal dust is normal on a cps that goes in to the bellhousing area...........bendix drive,ring gear,clutch etc all shed .the sensor is a magnet but it would really have to be loaded to degrade the signal and you are right that one would notice if there was a clearance issue the sensor would be short lived .