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I fitted a new sensor and it made no difference. I attempted to check the wiring from ecu to the plug on gearbox but my ecu is different to the one in that PDF above. I have lpg fitted to my car and I know that having lpg can confuse the fuel gauge. I'm starting to wonder I some how the gearbox also uses info on fuel usage to calculate load or something and maybe that's why it won't use e-shift? Any ideas?

I can check the resistance and wave a magnet at it, but its having the time to do it. I wish id had that document when the car was up in the air today!

Excellent, thanks for your help. Ill buy a sensor and try that first. Where did you find that document by the way? Is it available for the whole car?

I recently bought a Lexus is300 sportcross with 114,000 miles. The e-shift function desnt work. This weekend I read the error codes and it keeps coming up with p0715 which is for the gearbox's front speed sensor. Im planning on swapping the sensor and hoping that restores the e-shift, but reading a thread on a US website it says that the sensor might be fine, and that the error is generated by a speed difference between the sensor at the front of the gearbox and the sensor at the rear. The suggestion was that the transmission will need a rebuild. Every other aspect of the gearbox works fine. Its very smooth, no knocks or bangs and power mode works. Ive flushed the fluid, replaced the internal gearbox filter. There was no major swarf or debris in the fluid and although it was dark, it was not really bad. My question is, has anyone else had this sensor fail? Is it a common problem? Or is it more likely my tranny is on its way out?

No, that's the weird thing. Everything I've seen online suggests it should have 2 lines to the base of the rad. But the rad is blank and has no ports on it. It's definitely the original rad too. It's just burst so I bought a new one off ebay. The new rad has the cooler in it like I expected. Perhaps my car being an early ish 2002 sportcross 3 litre is different?

Yeah I bought 7 litres and planned to disconnect the oil cooler line and run the engine to pump out some more of the old fluid. However my car doesn't have the cooler on the rad, it is a small water to oil heat exchanger bolted to the side of the engine. So now I don't know which line is in or out?

Good idea I will check those tomorrow

Forgot to mention the filter for the box just unbolted easily no problem.

Started on the car today. I drained the gearbox and got around 4 litres out. Then I removed the transmission sump. I took off all the underfloor plastic panels for access. All the bolts came out easy apart from on hidden by the exhaust bracket. The bolt from bracket to exhaust was well rusted so I just bent the bracket down. Sump came off ok but had to wd40 the bit where the dipstick tube connects to the other half of the dipstick tube. The oil fluid was pretty dark but no bad shrapnel in the pan. The magnets had a bit of dwarf on them but nothing too scary. I removed solenoid 1 and bench tested it as I had an errors code saying it was faulty. It worked fine so it must be a wiring fault. I also cleaned all the electrical plugs for the box I could find. I cleaned all the old sealer off the sump pan and refitted it. The sealer is curing overnight and I'll continue tomorrow.

Did a check of the codes. I had 3 errors logged. Bad signal from maf so I have cleaned it. Also solenoid A in gearbox in transmission error and turbine speed error. So I dropped gearbox sump and pulled solenoid 1 which I guess is A? I bench tested it and it opens and closes when energised. So must be wiring. I then unplugged, attempted to clean, and then reconnected all the connectors I could find on the gearbox. Hopefully this sorts it.

I am in need of an air box / air filter housing and plastic engine cover for an is300. No cracks or damage unless it's extremely minor. Thanks.

Bought a new rad for £75, auto gearbox fluid £65, auto gearbox filter £105, sealer, drain plug crush washer, coolant etc etc. Lexus ownership is expensive.

How many sportcross is300's were there?

Yeah, ill let you know how i get on. I only bought the car on Saturday. Car was perfect on test drive, no warning lights, nice and smooth, then the next day the e-shift stopped working, the rad sprang a leak and ive got TRC OFF and VSC warning light come up on the dash! So already ive had to buy a new radiator, and get the stuff to service the box in the hope it will bring back the e shift.

Cool, thanks. I ordered the filter today from Toyota, £104. Ouch. Will order the ATF too. Was gonna try and find a cheaper alternative, but the advice so far is unanimous and just get genuine TIV Toyota stuff. I am hoping to do this on the weekend. I might try the disconnecting the line to the rad cooler with the engine running to pump more of the old oil out before refilling. Any idea what the total capacity of these gearboxes is?