Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Andy H on 07 February 2012, 19:44:09
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Usual symptoms. Running sweet as a nut one minute, next minute I am sat at the side of the A38 with a dead engine and a mixture of homicidal (90+mph) and geriatric (35mph) drivers flying down the two lane A38 with me pulled over as far as I was able before I ran out of momentum.
AA turned up in 10 minutes :y and the previously lifeless engine sprang into life first turn of the key ::)
After moving to somewhere a little safer the AA man plugged his wireless code reader into the fuse box and retreated to his van to interrogate it remotely.
After a bit of tooth sucking he returned with error code P0725+ 'engine speed input circuit'.
'Crank Position Sensor then' I said innocently 'I have got a new one in the boot'. Oh no says AA man, that would be a different code..............
After 30 minutes (with Omega idling sweetly next to us) discussing what else might give a speed reading AA man turns to go and the engine cuts out again. No new codes.
I am fairly certain that fitting my new CPS will fix the problem but I need to be somewhere stupidly early tomorrow. If I was 100% confident then I would be out there now fitting it but if there is a chance that it won't work then it is better to make my apologies for tomorrows appointment.
Any thoughts? I changed the crank sensor on my previous Omega after almost identical symptoms. My abiding memory is of how awkward the access is to anything at the back of an Omega engine :(
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unbolt the plenum chamber from the intake manifold, get a piece of string with a spanner on the end of it or similar, throw it own the passenger side rear of the engine and jiggle string till spanner drops on floor, undo old CPS and tie new CPS connector onto string instead of spanner, keep tension on string while feeding new CPS wire upwards round the downpipe/manifold flange
connect new CPS to connector at rear corner of plenum, bolt plenum back down, make sure everything is connected with O rings between plenum and intake manifold in place
away you go :P
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crank sensor usually throws a p0340 code have you paperclipped/pedal trick yourself to confirm code, dont think i have heard of a p0725 :-\
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crank sensor usually throws a p0340 code have you paperclipped/pedal trick yourself to confirm code, dont think i have heard of a p0725 :-\
Cam, crank is 0335 ;)
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sorry my mistake yes its p0335 :-[
P0500 Vehicle speed sensor malfunction
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New sensor fitted & car runs. Fingers crossed that normal service has been restored.
P0725 was the code the AA read for me (and cleared). I couldn't find any codes when I got home. Google brings up references to the code on Vectras, Audis and Nissans so I think it must be a generic OBD2 code.
Got an hours drive in the morning before my 6am appointment so time to get some sleep.
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unbolt the plenum chamber from the intake manifold, get a piece of string with a spanner on the end of it or similar, throw it own the passenger side rear of the engine and jiggle string till spanner drops on floor, undo old CPS and tie new CPS connector onto string instead of spanner, keep tension on string while feeding new CPS wire upwards round the downpipe/manifold flange
connect new CPS to connector at rear corner of plenum, bolt plenum back down, make sure everything is connected with O rings between plenum and intake manifold in place
away you go :P
Sorry mate,but this isnt the best way to do it.As stated in the guide,route the wire over to the inner wing and behind the brake pipes - as far away from the heat of the manifold as you can reasonably get it.Its also much easier, no need to remove plenum or anything else apart from the sensor. :y
http://www.omegaowners.com/forum/index.php?topic=90540.0