Does it crank okay while making the noise? Theory 1 would be that the power steering pump draws a lot of power and maybe pulls the battery down to the point it can’t start (while the pump is running)
As for why it stalls in the first place, it could be a similar thing with a weak battery as mentioned? Or something else is causing the ECU to reset.
I would guess that the pump running is a failsafe and probably the intended functionality if it loses communication with the ECU. If you were travelling at speed and something went wrong, it would be far better to keep the pump running rather than stop it.
Good point, much appreciated! I had this put aside to see if cleaning the earh connections and fully charging the battery did any good. Today it turned out that it didn't and I got the same issue, but VCDS came up with a couple additional codes I didn't see before:Also, the power steering pump is underneath the ABS controller, so it could be that making the noise.
The noise is clearly linked, so identifying that could be quite helpful.
For all of those errors to appear, something quite major is happening, either a short to ground, as mentioned above, or power loss to the ECU. I’m fairly sure no matter what happens to its CANBUS, the ECU should keep running the engine.
The throttle controller is only powered/grounded by the ECU, so the ECU is what’s faulting.
May not be relavant, but on the FSI, a fault in the power steering triggers a limp mode power reduction, via the injectors, for safety as control is compromised. Such an intervention may well prevent starting.
If the engine cranks, then the power steering pump is not drawing significant power. The battery couldn't do both.
I'd suspect the PS Controller
Mac.
May not be relavant, but on the FSI, a fault in the power steering triggers a limp mode power reduction, via the injectors, for safety as control is compromised. Such an intervention may well prevent starting.
If the engine cranks, then the power steering pump is not drawing significant power. The battery couldn't do both.
I'd suspect the PS Controller
Mac.
PS controller doenst have Kline only CAN and only able to talk to the cluster, which reports errors on it’s behalf , based on Audi documentation. It’s on the same CAN network as the abs, engine and cluster.@Edwrai @Sveshais if it happens again, try turning the wheel while the noise is happening (engine off). The pump is just a gear pump, so it shouldn’t be able to make anything other than “normal pump noises”. It does have an over pressure valve in it though. Maybe in this fault state, the pump goes to full speed and the noise is the over pressure valve. If that’s the case, you’ll have very light steering while it’s happening.
@Sveshais which controller are those latest codes from? Guessing not the engine ECU?
If you could post an Autoscan of all modules that would be very helpful
I’m still leaning towards ECU/ECU power. The only way the power steering is connected to the ECU is by CAN and K Line. So the only fault it could create is shorting the CAN and K line to ground/12 volts. As there is the throttle control error, something is going wrong with the ECU when this happens, which would mean Magneti Marelli didn’t protect CAN and K line and allow faults to reset the ECU. I would be very, very surprised if that was the case.
Sorry, of course, scans attached. There are two: first one done when check engine came up a few days after all codes being reset during the initial earth connection check and battery charge, and another one after the latest stall. Files are named accordingly. No codes were cleared in between, it might help to filter out the unrelated codes as they are quite a few.@Sveshais which controller are those latest codes from? Guessing not the engine ECU?
If you could post an Autoscan of all modules that would be very helpful
I had very simliar ones, I have changed the ignition relay and it does seem somehow to have improved but has not gone, its very strange, I need to have a poke around under the floor and the earth points.Yeah you’re right, I was clearly hallucinating when I checked the SSP.
If you’ve swapped the cluster and ECU it does seem that way.
I originally thought it would want to keep the engine running under all circumstances, but it’s not really dangerous if it stops thinking about it more. Maybe if the CAN bus goes mad it triggers the same kind of failsafe as what happens in a crash, and stops the fuel pump?
Out of interest, did you have the same codes as @Sveshais
Sorry, of course, scans attached. There are two: first one done when check engine came up a few days after all codes being reset during the initial earth connection check and battery charge, and another one after the latest stall. Files are named accordingly. No codes were cleared in between, it might help to filter out the unrelated codes as they are quite a few.
Actually, the G 250 is mounted in the bottom part of the steering rack, not in the pump. It was also only there for the early cars.Now this is interesting from the Audi self study guide
Power steering sensor G250
The sensor is located in the valve dome of the power-assisted steering box.It records the steering angle and calculated the steering angle speed.If the sensor should fail, the steering function is still guaranteed.The power steering shifts to a programmed emergency running mode. The steering forces required are greater.Error functions are stored in the power steering control unit J500.
I think I'm going to give changing the pump a go as this sensor is inside the pump.
Actually, the G 250 is mounted in the bottom part of the steering rack, not in the pump. It was also only there for the early cars.