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Eml: P0763 (Shift Solenoid C, Electrical) & P0715 (Input / Turbine


MUDGUTS
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Hi,

I have a 2004 GS 300 with about 135,000 miles on it, reasonably new to me.

A month ago at the start of a trip across town the EML came on, I ran a scan for codes after driving a few miles and got P0763 (Shift Solenoid C, Electrical). I completed the journey and then after parking up for five minutes when I switched the car back on the EML was off.

When I got home I cleared the code and all was well until yesterday when it came on again. I cleared it again and drove the car for a trip into the country and back but today it's back on. This time when I scanned I have: P0763 (Shift Solenoid C, Electrical) & P0715 (Input / Turbine Speed Sensor A Circuit).

Incidentally the day before the light came on the first two occasions I have had the car jacked up and have been working on the rear brakes. It has occurred to me that when I have tightened the wheel nuts after refitting the wheels that by the wheel rotating slightly whilst off the ground it's triggered something in the transmission. This could be a coincidence though. The P0715 first came on today.

Looking for a bit of info. The car drives OK. Sometimes it's noticeable that you have to rev slightly when first starting off before the transmission takes up the drive but other than that it's fine.

ATF has been drained and refilled 2 litres at a time a few months back, it's in good condition now.

What's the worst that could happen?

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Hi Colin, I'm going to re-check this, this afternoon but I'm pretty sure that unless it's lost any (no signs on the drive) it will be 100%.

Each time I drained (always cold) via the sump plug on the Transmission pan, I measured what I had drained and put in exactly the same amount. After a few weeks of doing this I did one final check and it was OK. The level was good before I started this process.

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Yep level is good. Checked today. It looked very slightly low after a run, so I added about 75-100ml of type 4 then went for another run and checked again, this time it looked slightly high so I think the level is fairly good.

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You can buy the shift solenoids individually so if the Lexus answer is to replace the whole transmission it may be worth sourcing the correct replacement and then finding a decent auto transmission specialist to fit it.

Providing there is nothing in the way the transmission sump is dropped and then the shift solenoids are accessible.

From what I understand the solenoids can get gummed up and so fail to activate when commanded by the ECU giving problems with gears engaging and shifting.

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Thanks, it shifts ok and has those buttons on the steering wheel to change up and down manually, they also work perfectly, however I have observed it never goes down to '1'... Up and down through the gears 2 -5 ok otherwise. I think I read that this is normal.

I have a quote from Lexus to drop the pan and change the filter etc. and check the solenoids at the same time, so I might well have to do this and have that solenoid replaced.

As always, I'll keep you all informed.

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EML was on again this morning, once I was out of the drive I had a go at selecting gears manually. The car would not go into '2'. As I pressed the buttons on the steering wheel I got two short bleeps each time I tried. Later on after a couple of miles, it was possible to use all the gears.

When I got home from a short journey and scanned this time just P0763 (Shift Solenoid C, Electrical). I've cleared it.

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  • 4 months later...

Update:

This fault has been on & off at various times over the last 4 months. I can do up to 2000 miles between it coming on.

Each time I just reset the EML. I noticed recently that it was not possible to reset but after a little drive and I assume once the ATF has warmed, a reset was possible. Also if you put the car into manual mode, the 'M' flashes and the car won't shift.

...so I'm just going to live with it  

 

 

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