Hi guys

Need help on this one, got a 54 plate VW Beetle 2.0 with AZJ engine.

Car drives ok up to around 3000 revs, then EPC light comes on and rev counter becomes erratic jumping between 3000/3500 revs. Carried out code read with launch 16705/p0321 ign distributor engine speed input circuit G28 range/performance int. Replaced crank sensor but still exactly the same.

Checked crank sensor and cam sensor images on scope, pictures look ok [havent got crank versus cam picture to compare to but signals look ok] have changed plugs because wrong ones fitted after service and checked timing belt but all looks fine. Car is doing my head in now so any help would be great

Thanks Dave

did you check it on the back of ecu? -Crank signal.

Hi Dave,

16705

Regards
Dave

piotr/dave thanks for replies,i havent checked wiring at ecu yet piotr,i did try but customer needed car back and i havent much information on location of ecu,just autodata but its a bit vague,i will do that next and report.dave,thanks for your very useful information on ecu updates,do you happen to know if this applies to AZJ 2.0 petrol engines as my local vw main dealer is not much help on this many thanks dave

Hi Dave

Re the location of the ecu, it is under the top panel of the left hand side of the dash board, just back from the windscreen with the pollen filter. I had a nightmare with one of these, then found the culprit was a hungry mouse that had been nesting in the pollen filter, so the wiring back to the ecu is well worth a check!! Let me know if you need any additional location info for the ECU

HTH Roger

roger,thanks for info,will check wiring.is ecu easy to get to?

Hi Dave - sitting in the passenger seat once you get the upper dash panel off it is to the right of you down in the dash, roughly just left of centre. Dont tug or pull too hard when removing the panels though, the usual rules apply when working with plastic!!!

HTH Roger

thanks roger,will have a look next week and report