Lets dispel some myths .................
The Car will have a 16 pin diagnostic socket, but it is not OBD compliant
. Unless it has been on SDS and that doesn't communicate with ME2.8, then you can't draw any conclusions from using cheaper machines on these cars.
Secondly, we can discount K40 since the Cooling fan is not flat out and the Car starts and runs with starter hotwired, therfore the critical 2 relays in K40 are working, i.e. the ME Power Supply "Motor Relay" and the Fuel Pump Relay.
My best guess without some more details is on one of three items .................
Pulse Module (NOT K40) pulse Module is underneath the Fuse Panel in the Underbonnet Fuse Box, opposite side of Car to the Battery !!
Wiring from ECU to Pulse Module
Question ........... Auto Trans or Manual ?
If Manual check Clutch Pedal Switch.
If Auto ....
Question .......... Does the Gear Display in ICM change when you move the Selector stick P, R, N etc
It could also be a fault with Auto transmission conductor plate as there is a Starter Inhibitor Microswitch in it. SDS can test all that in a heartbeat with live data, I do believe a Snap On machine will also check that data PID.
I do wish folks would refer to the Wiring diagrams, but seeings as I posted the 4 cylinder version of this picture earlier on in another thread here is the V6 diagram ................
View attachment 624086
Try these tests ....
First check Pin 1A has 12V + at all times regardless of Ignition Switch Position. Use a Test BULB rather than a multimeter,
bulb must light brightly, do not use LED Type tester Multimeters and LED's can report false positive as there is no load.
A 5W Bulb attached to a couple of wires is the daddy !!
Now check Pin 2B has 12V + with Ignition in Pos 2 and in Pos 3 (Cranking position)
Also check that 1B has a good 12V + supply with IGN Switch in Pos 3 (and Clutch Pedal depressed on Manual or Selector in P / N Auto), that will eliminate Clutch Switch / Auto Inhibitor !!
If those tests are OK now try this ....
Ignition Switch On in Pos 2, apply an EARTH via a bit of spare wire directly to pin 2A of the Pulse Module if it now cranks you have eliminated the Pulse Module.