512TR Secondary Air valve Fault code

BR in the UK · Dec 12, 2021

ants2au said: ↑

Lots of resolved issues tonight.

If you check out the schematics attached, apart for the fact that they dont link up properly, so had to guess a few things. The upshot of it is that Relay V, supplies both the Air Pump (01407) and the 1-6 Secondary air solenoid (connector 41051 pin 12). The Relay is driven via Pin 32 of the ECU (I so love the Motronics 2.7) which goes back via connectror 41051 (pin 14).
With the Air pump seized, it was blowing Fuse 8. So the relay was removed, causing the ECU to fault (no path back to Pin 32).
So now Air pump removed, relay back in, NO MORE FAULT. Woooo.

And on a still positive note, the impeller can be removed via a 2mm hex grub screw (if you look carefully towards the center of the impeller, you can just make out a cutout in the blade). So motor can be removed for reconditioning, hopefully.
View attachment 1488489
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HI Anthony, Its been 10 years since you wrote this but I have the same fault on my car now and your work on diagnosing gives me a great stating point. My problem is with Bank 1-6 so I will look at the rely, the fuse, the air pump and the solenoid. Appreciate your help.

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512TR Secondary Air valve Fault code

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