engine speed sensor , vag com

[john0113]

my 2001 1.4 vw polo has been read by vag com at independant vw garage . the fault code is 10606 engine speed sensor G28 intermittent no signal . the garage have had car for months and cannot find the fault . It runs fine when fault is deleted but when restarted a couple of times you hear relay 410 of the fuel pump clicking like mad as soon as you hear this the ecu, oil light and clocks stop working . they changed the relay for fuel pump , it has had new ecu , engine speed sensor , crank sensor, coil , new clocks but still the same . they have checked wiring and is ok they say . last week they said they fixed it and it was clocks but sadly it was not . they have contacted bosch and they say its possibly to do with high frequencies of something affecting engine speed sensor , as it is to close .i m starting to think now that the speed sensor fault code is taking them up the wrong alley but im not sure . has anybody heard of this or could anybody possibly shed any light on this bad headache for me , thanks john

[Crasher]

Can we have the engine code and the chassis year, wvwzzz6Nz ? Y000000

[john0113]

Can we have the engine code and the chassis year, wvwzzz6Nz ? Y000000
engine code is WVWZZZ6NZ1Y039016 and chasis yr is y214tkl , thanks is this imformation right mate

[john0113]

where do you get engine code

[john0113]

engine no is AUA029010

[Crasher]

WVWZZZ6NZ1Y039016 is the chassis number which is perfect for me, back in a moment.

[Crasher]

10606 engine speed sensor G28 intermittent no signal doesn’t exist, it must be “16706 (P0322) Engine speed sender -G28 no signal” or “17806 (P1398) Engine speed signal, TD short to earth”

[john0113]

thats what they told me it was mate , sorry have to get back on to them tomo ,and get back to you .

[Crasher]

OK, try and get a print out of the code next time they do a scan.

[john0113]

they said the fault code is 16706 engine speed sensor crasher . i spoke to them last week and they said it was a signal cutting out fuel pump but they dont know why

[Crasher]

If the sender doesn’t send out a signal, the ECU will cut the fuel pump relay command feed, it is a safety function. The sender needs to be replaced before going any further.

[john0113]

im not very good on cars , what do you mean by the sender mate . how come its drive fine when the fault is deleted until you turn the ignition off a few times though . have you come across this sort of thing before

[Crasher]

Sender, sensor-same thing. Yes, it is a very common failure and we only fit genuine speed sensors as pattern ones are rubbish.

[john0113]

that was the first thing they changed and it is deffinately a genuine part

[john0113]

crasher , the car has had new genuine speed sensor and the wiring has been checked beteween the ecu and sensor for continuity but still the same . any ideas what i could do next , thanks john

[Crasher]

I have had one car with this problem where it was the ECU and so has a trader friend of mine but that was on a Golf 4 1.6 with the AKL engine. I wonder if they replaced the correct sensor? Do you have the cost of the part or even the part number to hand? The VW test routine on this states to change the ECU in a case like this but I am always a bit sceptical of just changing ECU’s. It may be worth getting it tested but I have had some bad experiences of ECU testing companies.

[a8 tech]

id be looking at all the multiplugs for loose pins and bad earth as more than one system playing up here.

[john0113]

hi mate what do you mean by multi plugs and loose pins

[john0113]

crasher , when i first took it to garage they changed sensor and said the vw book is saying it must be ecu now , so i i bought a new ecu of e bay and they put it on but was the same . i paid 55 pound for the speed sensor

[a8 tech]

id be looking at all the multiplugs for loose pins and bad earth as more than one system playing up here.electrical connections that may share multiple wires for differant componants ie one plug may have the dash wiring and the fuel pump wiring in it so if there is movement of the plugs these two systems could be affected,same as the earth,if they share a earth point and its loose then it would explain the relay clicking and dash lights as this normally means there is a resistance issue.

[john0113]

would something like this be hard to find as my car been at independant vw garage for 7 months now and not be able to locate fault .

[Crasher]

Plus or including VAT?

[a8 tech]

id tell your workshop to run some wiring along the exsisting wiring for this circuit and try that,i presume they have checked all the wiring for resistance and mutual shorting.Difficult fault to cure without eliminating the wiring and earth points.Idea with very advanced wiring on audi a8,q7 etc and most faults i find are actual loose pins or loose earth points which drive me mad in the ed

[john0113]

crasher 55 pound 40 for speed sensor , 40 pound labour and total of 112.09 with vat mate

[Crasher]

Well a genuine G28 sender is £66.60 inc. VAT (my price list is slightly out of date) and a G40 sender is £24.25 so the sender cannot have been genuine.

[john0113]

crasher , thanks for that i will check with garage on tuesday . i took it to small side street garage and they put new speed sensor on first but when it never worked i took it to ind vw garage where it has been for months and that was the first thing they checked , that it was a genuine part . do you think it could have the wrong sensor fitted then as they said same things as you that vw manual says to change ecu .

[Crasher]

Well the ECU and sensor have been changed and the wiring checked so that is the system. Now the possibility of a fault with the speed sensor ring has to be investigated so the next step would be to remove the gearbox, clutch and flywheel to examine and replace the sender wheel. This is a complex process that must be carried out using a special VW tool or the correct positioning of the sender cannot be guaranteed. One thing, has it had a clutch or flywheel oil seal replacement?

[john0113]

craher im not sure if its had a new clutch or seal as my girlfriend bought it when i was on holiday last year . she drove it for about a week before this started and its just gone from there mate . not sure if its worth fixing then as that sound like big job and i spent alot trying to get it running for her already . how much would it cost to check it do you think

[Crasher]

It is a good six hours labour, plus part (£63) and the tool would need to be bought but I have no idea how much the tool is, I would guess at £100 or so. The clutch has to come off so as these are highly unreliable on these I would also fit a new clutch, another £100 ish.

[john0113]

ok thanks mate ill speak to garage on tuesday , is there no way of checking before you take the clutch and gearbox out and what if its not that .

[Crasher]

It is impossible to check it without removing the flywheel. If it isn’t that, they have missed something.

[john0113]

thanks for your help crasher , let you know what the say