'98 LS400 CEL p0763
04-13-17, 06:26 AM
#17
Since I have had only two episodes with this code and both times they disappeared, I am leaving it for now. Will re-check fluid level at next oil change.
I got new ATF pan a year ago, would hate to drop pan again.
I got new ATF pan a year ago, would hate to drop pan again.
04-28-17, 08:22 PM
#19
code disappears after car sits overnight.
12-03-17, 12:10 AM
#20
Anyone else has this very intermittent P0763 code? I had it a few times after long highway driving and it disappears by itself. Transmission works without issues.
What testing should I do before dropping pan and changing the solenoid? Should I do it at all if the MIL lights up very rarely and disappears by itself?
I have a 1999 LS with 240K miles.
Val
What testing should I do before dropping pan and changing the solenoid? Should I do it at all if the MIL lights up very rarely and disappears by itself?
I have a 1999 LS with 240K miles.
Val
12-03-17, 04:35 PM
#21
Moderator
Anyone else has this very intermittent P0763 code? I had it a few times after long highway driving and it disappears by itself. Transmission works without issues.
What testing should I do before dropping pan and changing the solenoid? Should I do it at all if the MIL lights up very rarely and disappears by itself?
I have a 1999 LS with 240K miles.
Val
What testing should I do before dropping pan and changing the solenoid? Should I do it at all if the MIL lights up very rarely and disappears by itself?
I have a 1999 LS with 240K miles.
Val
To make a long story short, it was fixed after cleaning the strainer and the ATF change twice.
The fixing process was as follows. At first, I checked the solenoid applying the DC10V (not 12V to confirm that it works with the lower voltage) to the solenoid C which is connected to the pin 5 of the connector B63 as is shown by 2 red arrows below. I heard the clicking sound from the AT body then. I also checked the resistance and it was around 14 ohms if I remember correctly. The next step was to drop the pan and checked the strainer. It was not very clean but far better than mine indicated here below.
https://www.clublexus.com/forums/ls-...ml#post7654776
After that I cleaned the strainer and changed the ATF using a method of drain and fill. The problem was completely gone after that.
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valex (12-03-17)
01-19-18, 10:50 PM
#23
Moderator
Another P0763 happened on a Toyota Brevis
Three days ago a local shop owner called me asking to check the solenoid C used on a vehicle named Toyota Brevis. We used to call that car another mini Celsior UCF30 in Japan. It uses the AT Aisin A650. You can find some more about Brevis here.
https://en.wikipedia.org/wiki/Toyota_Brevis
The shop owner detected P0763 and he asked me to test the solenoid C without removing it from the car. He is not fond of electric related affairs. So I checked it at the pin #5 of the connector located at the left side of the AT and the resistance showed 13.6 ohms. The functional test applying DC10V seemed to be good since I was able to hear the click sound constantly from the AT body every time when I apply the voltage very quickly and very slowly. I even was able to hear chattering sound when I slid the contact.
We decided just to do the drain and fill since the solenoid seemed to be fine. We did it twice and after that, he drove the car for 2 days. There was no more problem but he tried one more time yesterday aiming to be the ratio of the new ATF is more than 60%. ( ie: ATF capacity 8.3L, drains 2.2L each. 2.2/8.3 can be changed each time. The new ATF ratio can be calculated as 26.5% at first, 46.0% at second, 60.3% at third) The problem was completely gone now.
https://en.wikipedia.org/wiki/Toyota_Brevis
The shop owner detected P0763 and he asked me to test the solenoid C without removing it from the car. He is not fond of electric related affairs. So I checked it at the pin #5 of the connector located at the left side of the AT and the resistance showed 13.6 ohms. The functional test applying DC10V seemed to be good since I was able to hear the click sound constantly from the AT body every time when I apply the voltage very quickly and very slowly. I even was able to hear chattering sound when I slid the contact.
We decided just to do the drain and fill since the solenoid seemed to be fine. We did it twice and after that, he drove the car for 2 days. There was no more problem but he tried one more time yesterday aiming to be the ratio of the new ATF is more than 60%. ( ie: ATF capacity 8.3L, drains 2.2L each. 2.2/8.3 can be changed each time. The new ATF ratio can be calculated as 26.5% at first, 46.0% at second, 60.3% at third) The problem was completely gone now.
10-10-18, 02:51 PM
#24
Driver School Candidate
Okay guys, CEL code p0763. I've changed the trans fluid recently, it's a nice color red. This was a cheap shot at trying to fix it, because it needed to be done regardless. I swear, the car shifts fine but I'm not exactly 100% of that. I've had the code since I purchased the car off of my uncle a few months back and haven't really been driving it that frequently. But I am wanting to try to get this code clear ( and the problem fixed if possible).
Some options I have considered but haven't followed up:
Seafoam Trans Tune (probably won't fix my issue here)
Replacing spark plugs (I have done this once already)
Having the trans flushed (not too keen on the idea of this)
Short of that, I have been doing some research on these forums (and other forums) regarding changing the shift solenoid 'c'. My understanding is this really isn't THAT complex. Empty contents of trans pan, pull of trans pan, unbolt the solenoid, coat new solenoid in some ATF (Toyota T-IV) strap that sucker in and bolt it back, replace gasket on trans pan and make sure you replace the fluid you lost. Sounds simple enough, right?
My question is this: where can I get the solenoid? Should I go through a dealership? Found this, but is it even the correct part? http://www.lexuspartsnow.com/parts/l...270-30030.html
Also, does anyone happen to have a diagram that would help me locate which solenoid I need to be changing?
Some options I have considered but haven't followed up:
Seafoam Trans Tune (probably won't fix my issue here)
Replacing spark plugs (I have done this once already)
Having the trans flushed (not too keen on the idea of this)
Short of that, I have been doing some research on these forums (and other forums) regarding changing the shift solenoid 'c'. My understanding is this really isn't THAT complex. Empty contents of trans pan, pull of trans pan, unbolt the solenoid, coat new solenoid in some ATF (Toyota T-IV) strap that sucker in and bolt it back, replace gasket on trans pan and make sure you replace the fluid you lost. Sounds simple enough, right?
My question is this: where can I get the solenoid? Should I go through a dealership? Found this, but is it even the correct part? http://www.lexuspartsnow.com/parts/l...270-30030.html
Also, does anyone happen to have a diagram that would help me locate which solenoid I need to be changing?
p0763 shift solenoid valve no. 3 circuit severity on my code reader. I just want to make sure before I plop down $210.
10-15-18, 06:05 AM
#27
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