crank, no start advice please

[78F350]

It's been years since I had an issue with a Tiptronic, but from what I remember if the car did not sense that it was in (P) or (N), it would not Crank. If yours cranks, the issue is likely elsewhere.

With the bad immobilizer box, did you have a good look at the connectors and harness that plugs into it? A rebuilt box will still have symptoms if the wiring is bad.

[gbp808]

Thanks 78F350.
Reassuring about tiptronic!
I did a brief inspect/crc spray of the harness plugs, will re-check.
How about dielectric grease?

[gbp808]

Well, I have moved from immobilizer to the basics, gas and spark, as you all suggested a month ago.
Zero pressure at fuel rail!
Relay INPUT(female side) checked:
85 (power TO relay) gets 3.6V with no key, and in position 1+2
86(ground) good
87(direct battery feed) : no voltage with any ignition key setting.

C4 fuse good.

bench test relay good

To my slow-turning logic, there are enough issues at the relay plug-in site that i shouldnt tear into the fuel pump side yet?

any thoughts on low voltage TO the relay and ZERO V where high current battery should be present?

thanks very much folks
garry