Polo 6N2 2000 1.0L immobilizer issues

[John24]

Hey guys,

Took my car to get new tyres and when I tried to start the key it would not. After 6 attempts it did. Got back and scanned with VCDS and saw this

Code: Select all

Address 01: Engine        Labels: None
   Part No: 030 906 032 BC
   Component: ME7.5.10            3174  
   Coding: 00031
   Shop #: WSC 00000  
   VCID: 4C97934A7C7D9F2A79-5140

1 Fault Found:
17978 - Engine Start Blocked by Immobilizer 
            P1570 - 35-10 -  - Intermittent
Readiness: 0000 0000

Address 25: Immobilizer        Labels: 6X0-953-257.lbl
   Part No: 6X0 953 257 
   Component: IMMO                0004  
   Coding: 00001
   Shop #: WSC 00464  
   VCID: 7DF10E8E7747E6A2BE-4B02
   WVWZZZ6NZYY580027     VWZ1Z0Y0291758

1 Fault Found:
01176 - Key 
            07-10 - Signal too Low - Intermittent

Cleared the codes and tried again and it would sometimes start on the 5th go and sometimes. But no codes have come back. I looked at the readings and got the following with key in the and with ignition on.



When I turn the key to the ignition position I can hear the pump is not priming, but sometimes it does (seems random). I've tried a spare key and got the same result.

Any suggestions?
Thanks

[Bazzad88]

Hi I pretty much had the same problem as you, mine got to the point where it would only fire up for a split second and then die, then it would only crank, your immobiliser might of given up, I changed the immo box, ecu and key chip and it now works fine, if you need to get those 3 parts then they all have to come from the same car

[John24]

Hi I pretty much had the same problem as you, mine got to the point where it would only fire up for a split second and then die, then it would only crank, your immobiliser might of given up, I changed the immo box, ecu and key chip and it now works fine, if you need to get those 3 parts then they all have to come from the same car

Thanks for the reply Bazzad88, I can assume that was not cheap?

[Bazzad88]

No problem mate, I think I got the 'ecu kit' on eBay, I think it was about 100 quid, just make sure you check the part number on your ecu and get one the same if possible

[John24]

Well as you suggested yes ebay is full on ECU kits for the Polo 6n2 but they also sell the instrument cluster, does that mean that along with the ecu + immobiliser + key chip I would need to replace the instrument cluster too?

[John24]

Ok I have tested all the fuses all seem great but what I also tested was the spark on all 4 spark plugs there was none. So there is no spark being sent to the spark plugs it seems.

https://workshop-manuals.com/volkswagen ... ansformer/

I also tested the coil pack secondary coils and got 4.7 koms which seems within spec and I also tested the output terminal which sending 12.8v to the coil pack. BUT when cranking the engine it was sending signal to terminals 1 and 3 which means the ECU was sending a signal to the coil pack if I am right. The testing manual says to use an LED i just checked if voltage was coming back at 1+4 and 3+4 pins which it was.

[John24]

Well ignition coil helped and the car does start BUT mostly on the 3rd/4th go. Sometimes it does fire up on the first go but that's rare. Now I tried push starting it and it fires up right away, i'm really confused.