Audi A1 2012 will not start after rear pads changed

[Crasher]

Remind me tomorrow so I can look at the wiring diagram. Did you take a positive feed direct to the starter solenoid 50 connection with the red/black cable disconnected? It being manual, have you tried bump starting it?

[Crasher]

There are two starter relays (because of the stop/start), both part number 4H0 951 253 C and both on the relay board at side by side at positions 6.1 and 6.2 with the group number 646 printed on top, there are two other 646’s at positions 3 and 10 so you could try swapping them around.

[FrenchAudi]

have you tried bump starting it?

OP said in his first post that the engine turned over many times without starting before the motor wouldn't turn it any more.

[Crasher]

I know, but I have had cars with a bad engine earth that will crank over but not fire although they will bump start instantly.

[aw911]

Hi crasher thanks for the reply and the solenoid details.

I couldn't get the plug off yesterday to put a feed directly onto the starter solenoid. On the deck that is what extended the pinion from the starter. The main positive feed is what caused it to rotate.

I tried bump starting it down a slight incline on the 1st evening a couple of times but it didn't fire. Unfortunately I was pushing so didn't get to feel exactly what happened. I am a bit wary about tow bump starting it at the moment as I am not sure about the state of the engine (in case it has somehow slipped the chain or there is another cause of engine siezure).

I also tried using the jump lead to create an alternative negative/ground to the block but this didn't change anything.

My plan is to try the solenoid swap and I also going to take some electrical cable to enable me to simulate the signal feed to the solenoid. Before I try and tow/bump start the car i am going to take spark plugs out and see if I can manually rotate the engine. It feels like it is a large star drive but not sure what size it will need yet. I am loathe to try bumping it until I am certain that the engine will turn.

Thanks for your input it is much appreciated.....I cannot even begin to imagine how you would explain a situation like this to a customer!!

[Crasher]

For the crank centre bolt I have seen three sizes, 18mm, 19mm and 21mm 12 point socket and I have a feeling yours is 21mm. A word of warning, make no attempt the rotate the engine anticlockwise as it is highly likely to jump a tooth.

[mickeybo]

The main relay on this vehicle has 2permanent 12v's via terminal 30 voltage supply relay at pin numbers 86-30 on relay key on at this relay must have 12v at ecu a92

sc1 sc2.3 sc3 sc4 sc5 sc6