Have you checked the 4 or 5 30 amp fuses in the engine electronics box? I would also check and replace all your fuses in the passenger's side glovebox fusebox.
If your diagnostic computer isn't able to establish a connection to the engine control module, then you might have a short or corrosion/water damage on connections. I would start with fuses, relays and then inspect all wires from the engine ECU to the firewall.
There are also a couple of reset procedures you can try. Hold down the check button on the instrument cluster (IKE), then insert the key and move it to the position where all lights on the dash are on, but no crank. then press the other button on the IKE and find the different tests (1 through 21 i believe)...there's a process documented in Rave under "L322 Range Rover System Description and Operation" under "Instruments" and "Description" on page 887 (link) that describes how to clear certain fault codes on the car without the use of any code readers.
Alternatively, you could disconnect the negative terminal to your battery and leave it disconnected for about 30 minutes. Then reconnect, reinitialize your SAS and try again. Also, check the basics like your battery and charging voltage to ensure that you just don't have a flat battery which can also cause issues like this.
If your diagnostic computer isn't able to establish a connection to the engine control module, then you might have a short or corrosion/water damage on connections. I would start with fuses, relays and then inspect all wires from the engine ECU to the firewall.
There are also a couple of reset procedures you can try. Hold down the check button on the instrument cluster (IKE), then insert the key and move it to the position where all lights on the dash are on, but no crank. then press the other button on the IKE and find the different tests (1 through 21 i believe)...there's a process documented in Rave under "L322 Range Rover System Description and Operation" under "Instruments" and "Description" on page 887 (link) that describes how to clear certain fault codes on the car without the use of any code readers.
Alternatively, you could disconnect the negative terminal to your battery and leave it disconnected for about 30 minutes. Then reconnect, reinitialize your SAS and try again. Also, check the basics like your battery and charging voltage to ensure that you just don't have a flat battery which can also cause issues like this.
