I'm going to try to keep this post as organized as possible. I just bought a 03 RR HSE with a crank but no start issue. I only bought it because seller messaged me a month or so after I inquired about it and asked me to make an offer because she was moving. I offered her $1000 and she accepted. I figured even if the engine was blown I could sell the parts and make money. Anyways, onto the issue.
The PO stated it was running great, then one morning it wouldn't start. I've ran a few test myself to see if I could diagnose it but I'm starting to think it's something electrical. When cranking, there's no fuel coming out of the schrader valve, nor is there spark at the plugs. I've manually forced the fuel pump to come on and then I can get fuel to come out of the schrader valve so I know the fuel pump is working.
On the dash it is telling me Air Susp Inactive, Transferbox Neutral (With blinking LO mountain), Trans. Failsafe Prog.
I have an Autel Mk808 scanner
P0000 - DM-TL heater signal fault.Last occurrence-plausibility
P1672 - Immobilisation ECU code exchange fault.Last occurrence-plausibility
3c - Gear switch fault
The live data function on my scanner states that the gear selection is in an "INVALID STATE" and gearbox operation is in "LIMP HOME".
If I shift into another gear sometimes the scanner will say "N" or "P" or "D" for a split second then go back to invalid state.
Yesterday the green PRND on the dash would say which gear was selected. Today it is not but the actual yellow PRND on the shifter says the correct gear.
I've considered the inhibitor switch to be at least part of the problem but I wouldn't think it would let the engine crank if it was the culprit. Correct me if I'm wrong.
I just bought a brand new H9 battery.
That's everything I can think of to explain the situation. I'd love to make this my next DD so any information on getting this thing running would be greatly appreciated! I really don't want to part her out!