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2012 octavia mkii cr tdi won't start

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Hi guys 

bought an ex ambulance scout non starter.

2012 cr tdi 

engine turns won't fire

sounds like maybe no fuel coming thru

any tips on checking fuel pumps 

in tank and high pressure pump?

any help appreciated.

 

I would see what fault codes you have first and post them on here.

Failure of the clutch pedal switch will also give the same symptoms.

 

  • Author

few codes hvac coolant fan.

main code is

5523 off vag comm

p1570

engine start blocked by immobiliser.

 

  • Author

press clutch pedal down engine turns no fuel getting thru 

obviuosly immobiliser issue.

Central locking does not work

only on the boot door.

 

  • Author

so what I can find it's an issue with the key antenna or dash cluster.

can be deleted 

has got a new key with it.

so they obviuosly thought it was that and not sorted it.

so maybe try to fix the issue or delete the immobiliser from ecu if all else fails

not ideal I know.

 

As you have a new key then it may not have been synchronised to the immobiliser or maybe it is a manual only key without the chip inside.

Also, central locking will not work remotely unless the key is synchronised.

This is the most likely cause unless you know that the key has operated before without the immobiliser issue.

 

  • Author

I've got a key that works 

Central locking still only works the boot lock.

the new key just says on dash no key

it's a brand new key from skoda

nhs don't worry about cost.

key may not be programmed or synchro correctly.

they probably got the key done when this issue started and most likely reason it was parked up.

al just get my mate the key man to check the new key and then look at the central locking.

will get the Immobiliser deleted from the ecu will fix the issue so I can start the car.

that's all I'm trying to achieve to begin with get the car running.

 

  • Author

so just to clarify central locking with the old key only the boot opens and closes non of the doors.

new key is seperate issue.

  • Author

Update 

spoke with a car electrician and he said not immobiliser problem.

as car would start and die.

so he says cam/crank sensor

or ecus failure.

but no codes for those 2 things so not sure.

ECU failure translates as "if its not what I suggested (cam/crank sensor) then I havn't an effing clue so I will tell you it's the most expensive thing in the hope that you take it somewhere else".

56 minutes ago, Jimoct said:

spoke with a car electrician and he said not immobiliser problem.

as car would start and die.

 

He is wrong. The way you can tell it is an immobiliser problem is that the car starts and runs for several seconds before the immobiliser stops the engine.

  • Author

that's what he said

mine just turns over doesn't start at all

so he said it isn't immobiliser.

he thinks that came up as i used the new key which he says isn't programmed from skoda.

he says

crank/cam sensor

or ecu failure. 

As it's ex Ambulance it might of had the wiring modified for "Run-Lock" ??

  • Author

the wiring for that is seperate

it's get the signal from and too the canbus behind the radio.

all that is on a seperate loom.

and has to be activated from the controller 

it s isn't that as my mate fits that to the cars.

Once it's disconnected its has no effect on the car.

 

will swap some bits around as I have another that I use daily.

so can try different things.

see what happens

wanted to see if anyone had any ideas.

before I spend hours on it.

 

 

  • 1 month later...
  • Author

quick update

ecu tested on another car starts and dies.

bagcom checked crank sensor got 260rpm so that's ok

tried to run in tank pump on vcds says it running but isn't relay clicks 

swapped pump out off identical car still same.

so obviously an electrical issue.

not sure if control module in drivers door could be at fault?

going to run the car of hpdp direct bypass all the electric see if it runs electrician said to do this.

if not have gremlins.

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