Hi,

I'm putting an LQ9 into my Landrover Discovery that previously had a GEMS Rover V8 4.6 twin turbo.
the LQ9 has its original wiring loom and PCM. It's a 2007 model with green and blue connectors.
I'm using the Landrover manual gearbox ( until I break it)
I'll be using the electronic throttle body as I'm hoping to utilise cruise control and also reduce tendency to stall under no throttle conditions offroad.
Cooling/ fuel lines/ reg / starting / engine mounts are all planned out ok.

I do have a few things that have got me stumped already and was hoping for some advice?

I can't find a solution to VATS.
As far as I can tell the usual thing is to either use a signal generator or get the PCM reflashed.

I can't find which wire goes to the PCM to transmit the VATS signal, all the wiring diagrams I've found suggest it should be a blue wire on pin 55 or 70 of the blue connector. There isn't a wire in pin 55 and pin 70 is a brown wire. Until I can identify the correct wire I can't use a signal generator.
I'd send the PCM to be reflashed, but I can't find anywhere in the UK that can do it. (Annoyingly I have various OBD leads and a high end MAC scanner but none will work with the HPtuner software and I can't afford the lead at £600)

I can't find out which pin is the VSS INPUT to the PCM which I presume it would need for cruise control?
From what I can tell, the Landrover VSS outputs at a similar rate to what the GM PCM would expect to see. I'm assuming that as I'm not using an auto box and my speedo will be wired separately from the PCM the actual speed discrepancy is unimportant?

I need to find a signal to drive the tach and also tell the air suspension ecu that the engine is running. On the original engine, this was from a connection on the alternator. I'm assuming the "F" connection on the new alternator would perform much the same function?

I hope I've put this in the right place and any help would be gratefully received.

 

Since you're using a truck PCM/tune, you cant use a signal generator for VATS. That is only on cars, like Camaros and Corvettes, so you are pretty much locked into having it tuned out unless you use the BCM out of the truck which would be more work than it would be worth to you.

The VSS input to the PCM is on the green connector pins #20 and 21. It will be needed for cruise as well as some drivability issues. As for if the Land Rover VSS will work, I have no idea. The actual speed isn't super important as long as its reasonably close.

The tach signal is on green connector, pin 10 and is a white wire.

 

So I need to find someone here in the UK that has either HPtuners or EFI Live to disable the VATS then?

Regarding the VSS, the landrover has a 12v feed into the VSS and an output to the speedo.=, so in effect one wire. Does anyone know how I would marry that to the GM PCM that appears to need two wires?