sam12345

iTrader: (1)

Use contact cleaner to clean all the connectors and the mating pins on the ecm and see if that fixes it

ALEXGS99

Yea I did the contact cleaner yesterday and it didnt solve the problem but it seemed to kinda change it. It's weird now my window, locks and something else (forgot) don't work when everything else is working and when everything else is acting up and not working my locks and windows work. I'm haveing almost all the same issues as you now except just a few. I'm really thinking it has to be the ecm if it worked for you. Just need to swap

sam12345

iTrader: (1)

Not necessarily may be the body one but a quick swap will give you that answer

sam12345

iTrader: (1)

Any luck fixing your problem?

ALEXGS99

Sorry got busy with some other stuff. It is now not malfunctioning all at the same time. Sometimes it does sometimes it doesn't. I noticed a constant thing is that soon as the thermostat gauge stops working so does the AC like clockwork but sometimes door locks and windows may work. If I restart the car everything is fine for a while then acts up again only after gauge turns off. Could there be a problem/malfunction with the thermostat you think is it possible that the AC is turning off cause the ecm is going into protection mode?

kene

iTrader: (2)

I received a PM and I thought this may help others in the futre who might have this issue.

Well keep in mind my GS300 is a '94 model year so my capacitor values more than likely are different, but once you open the top of the ECU (not necessarily the bottom), you will see the capacitors. There are 2 values per capacitor that you are really interested in.

1) The capacitor's "capacitance" in Farads (ex. uf [microfarad], pf [picofarad], nf [nanofarad]) .

2) The voltage rating of the capacitors in question. (50V, 100V, 150V).

When selecting the proper replacement capacitors, the most important thing is to make sure that you buy capacitors that have the same "capacitance" in Farads as each individual capacitor you are replacing on the ECU. I am almost certain in saying that on the LEXUS 2nd Gen GS300 ECU (and darn near every other toyota/lexus ecu) there will be various capacitance values across the circuit board. Write them each down individually on a list, and also writing the voltage rating of each capacitor as well. Also the "F" in farads can be shown either as "uf" or "uF". They are the same.

For example, if you came across a stock capacitor that has the following values:
100uf, 50V (100 micro farads at 50 Volts rating)

I would find an upgraded replacement like this below:
100uf, 100V( same capacitance, but with a higher voltage at 100V rating [kinda like a higher electric strength] )

Before de-soldering any old capacitors, or even trimming the wire leads of the new capacitors, take a step back and look over all of the upgraded replacement capacitors. See if they are significantly larger in size than the stock caps. And if so, more than likely they will need to keep their long wire leads so they can be sat high above the circuit board and bent over to the side (they will sit up high and horizontally). Visualize and picture each one individually before cutting, desoldering, and trimming anything.

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This old post below may help too, but keep in mind I strongly believe the capacitance values will be different considering it is a 1st gen gs300, so if you are a 2nd gen gs300, please remove your ecu from the car and open the top lid/cover so you can write down all of your capacitor values and voltages and order them from the same sites listed within this post below.
https://www.clublexus.com/forums/gs-...-level-fi.html



I hope this helps.
kene

ALEXGS99

Thankyou for the info kene I appreciate your help. almost ready to have the board tested then if bad try and have it repaired. I'll let you guys know how it goes soon enough.

kene

iTrader: (2)

Honestly, I would just go ahead and replace the capacitors either way. The capacitors are known to be an issue. When I changed mine out on my ecu, everything ran much smoother on the engine. Keep in mind there were no visual signs of any "bulged" or leaking capacitors. To the naked eye they looked normal.

ALEXGS99

Ok I'll have them replaced hopefully fixes all my problems

RaiderRob

Hi Alexgs99
did upgrading your capacitors solve your problem? I have most of the same symptoms as you but i also noticed that my alternator is starting to fail. I haven't had the funds to go and buy one. Luckily i still have my other car until i have a buyer. Gonna try and getmy gs fixed hopefully before someone offers me a good deal on my Lincoln