CPS senser

[jkata]

Whats the actual fault that is being shown?

I had a garage diagnose my 99 t2 last year with a CPS fault and couldnt find it to fix it. (using a plug in fault finder)

When I read the fault code myself I couldnt find the CPS fault, it was a fault with the sensor on inector 1 (sorry cant remember the name of the senser).

The symptoms where a lack of power from the engine when driving, would tick over and start fine.

 

[clivvy]

well, I just checked the manual, and my manual, plus the pdf you hav eis for a R20, and this is different to my engine. Looking at the pdf, the crankshaft position sensor page 387 connector shows it as connected. well, on mine, i have the connector, but nothing attached-where the plug hole is there is a sticker with numbers on it, this is why I am having difficulty in tracing mine!!

 

[clivvy]

Whats the actual fault that is being shown?

I had a garage diagnose my 99 t2 last year with a CPS fault and couldnt find it to fix it. (using a plug in fault finder)

When I read the fault code myself I couldnt find the CPS fault, it was a fault with the sensor on inector 1 (sorry cant remember the name of the senser).

The symptoms where a lack of power from the engine when driving, would tick over and start fine.

i hav eread, cleared and re read my codes, the only constant code is number 47 - crank shaft position sensor. ok, so the actual problems WERE bad running, stalling, non starting. I since changed starter (defo faulty starter), maf and earth and positive wires. Still have cps sensor fault, so current issues are "hunting", engine idles a bit uneaven and stalls randomly, basically at the moment, i dont trust it given the importance of the cps for the running of the car. As far as I know the fuel filter has been done, but i will be getting that done shortly...i really need to change the CPS...or at least check/clean it.

 

[lacroupade]

well, I just checked the manual, and my manual, plus the pdf you hav eis for a R20, and this is different to my engine. Looking at the pdf, the crankshaft position sensor page 387 connector shows it as connected. well, on mine, i have the connector, but nothing attached-where the plug hole is there is a sticker with numbers on it, this is why I am having difficulty in tracing mine!!

I'm a bit lost Cliv; all the T2s have the same engine, bar the 3.0 of course...so apart from possibly missing a turbo (and your sidebar says yours is a 2.7TDI so it won't be) it ought to be exactly the same.....what version are you saying yours is if not an R20?

 

[jkata]

I'm not sure they do have the same engine.

I had to replace the engine in my T2 a few years ago and I found there were two types, one with a sensor on the bell housing and one without- I found out the expensive hard way, having bought the wrong one and having paid the garage to fit it.

 

[clivvy]

no idea what version i have, the silver plate in the engine bay doesnt really tell me anything. All I know if the connector thats attached to the wireing loom isnt connected to anything! And according to the R20 pdf, it should be! as for checking the bell housing...no idea where that is!

 

[lacroupade]

no idea what version i have, the silver plate in the engine bay doesnt really tell me anything. All I know if the connector thats attached to the wireing loom isnt connected to anything! And according to the R20 pdf, it should be! as for checking the bell housing...no idea where that is!

Cliv the bell housing is the big chunk of metal where the gearbox casing expands to cover the clutch, flywheel etc before finally connecting to the engine......so its sits right behind your engine block. On mine (02 plate) theres a connector of some kind sitting just above the dipstick that has a cable that goes off into the bowels somewhere, but its too dark to see where.

To answer Jkata's point, ALL the engines are R20 in the T2 are the same (with the odd ancilliary differences of course; fuel pump, aircon etc..) - the variations we are talking about here (absence of a CPS for example) are almost certainly variations of engine management capability between earlier and later versions - but even the non turbo TD is the same block....the bell housing is part of the gearbox and a different kettle of fish...

 

[lacroupade]

The manual page says this, so actually I was wrong:doh, the sensor itself must be way down the front of the engine somewhere (or at least cabled to that point) close to the bottom pulley........but I'm still only guessing - see what you think:

The crankshaft position sensor (TDC) monitors engine speed by
means of signals from the sensing plate (with three protrusions)
installed to the crankshaft pulley. The data signal output is detected
at ATDC 70° and sent to the ECM. The sensor signal is used for
fuel injection control and fuel injection timing control.

 

[Toolbox]

This is where it normaly is.

On some early tdi engines, I belive it is not in the bell housing but in the timing case at the front of the engine.

 

[clivvy]

This is where it normaly is.

On some early tdi engines, I belive it is not in the bell housing but in the timing case at the front of the engine.

ok, so i need to check inside the timing case at the front of the engine? i assuem where the pulleys and belts are? i did already look there but i supopse i wasnt really expecting to see it there, so will look again...

 

[lacroupade]

Does this help?

 

[Timbo_1975]

Generally -but not always- it is the Zexel pumped (i.e. Hitatchi MAF) cars that use a sensor on the timing cover and NO sensor on the bell housing.

 

[lacroupade]

On some early tdi engines, I belive it is not in the bell housing but in the timing case at the front of the engine.

Jeremy out of interest, what would it be picking its signal up from in the bellhousing?

 

[lacroupade]

Hmmm the manual is a bit misleading on this one...me and mr Torchy have just checked and while my 02 plater has got the connector to the left of the i/c, there is indeed NO sensor in the position shown in the diagram I posted just above showing it just to the left of the fan pulley...so still intrigued to know where they've stuck the pickups in the machinery inside the bell-end (!) LOL ...and indeed exactly where this little ba*tard is?!

I see how its been driving you mad now Cliv!

 

[clivvy]

Does this help?

hmm..this looks familiar. the connector at the front of the IC, i have one of those. and yes, the wire goes down the front. I didnt think that was the cps, so didnt really check it. we might be getting somewhere, if i can actually get to the other end, the sensor, i can unplug it and check it...

guys, we are getting somewhere here, i am really apreciative of your help, you are really helping me out here thankyou.

 

[makeitfit]

and 385...

That's where I said it was on mine:thumb2
Front rhs as you look at it , behind the fan and to the left of the alternator

 

[clivvy]

That's where I said it was on mine:thumb2
Front rhs as you look at it , behind the fan and to the left of the alternator

nice one mate, will look for it either tonight, or weekend!! in fact, i think i have already seen it, slightly awkward but reachable?

If I can just get this fixed I can book my other car in for repair!

 

[clivvy]

heeeeeelp!

guys,

found the cps finally. traced the wire to down near the pulleys at the front. first thing I checked was the connection, all ok, "hmmm" i thought, "why are all the wires taped up and one wire is bent backwards"? so i untaped the cps connector wiring, to reveal this:

http://i176.photobucket.com/albums/w163/clivjoo/CIMG1379.jpg

so...odd, the two wires are "bound" together. one wire is silver, the other copper, so is this right? doesnt seem right to me but how could I replace the wire that runs back to where ever near the fuse box?

so anyway, traced wire down to cps and removed:

http://i176.photobucket.com/albums/w163/clivjoo/CIMG1380.jpg

only to find it wet with black stuff, oil probably...ok, not so good, what does this mean? i cleaned out the hole it slots into, that didnt seem bad at all, and didnt seem to be leaking...

what do you think guys?

 

[clivvy]

ok, just a couple of extar things i noticed. the cps is screwed in by one screw. yet the spot where it fits has two screw holes, either side, but one has a broken off screw. Thing is, the sensor has only one screw hole, so is it actually the correct sensor i have fitted?? if not, then how on earth have they botched this in to fit!

After cleaning the cps and refitting, I still have the running problem, just the hunting, hum of engine randomly going up and down, basically not running smoothly and confidently- this i believe is either the cps, or idle.

 

[Toolbox]

It looks more or les as it should, the soldered wire, should if I am right, be attached to a type of latticed / mesh wire that surrounds the other 2 wires slightly further back up the loom (like coax cable)

The harness is normally sealed up with some black sticky goo, and taped over at the soldered joint