20 Most Recent 1990 Lexus LS 400 - Page 4 Questions & Answers

i have this diagram, send me your email

What is the fault, send us the code number detected there.

I would start by cleaning the mass air flow valve by spraying a non-chlronated brake to the inside of it cleaning the small wires inside of it then let it dry for 10-15 minutes before re-installing.If the problem still exist then check the fuel pressure and make sure its within its specs.If its not within the specs then replace the fuel pump.

Did you reset the computer after installing the new coil? Culprit, "now" has to be only one thing I can think of. the "computer" or the fuse that might be in place for that coil. If you have spark on the passenger side, it can not be the ignition module, cap or rotor. Take both battery cables off the battery and wait 30 min. Rehook the battery cables. See if the new coil kicks in. If not, check the fuse. If not bad, problem left is the computer.

The location is Under hood, passenger side, front side of shock tower, mounted on top of fenderwell. Here is a picture of what it is that you are looking for:
Easy to get to and easy to replace. I'm afraid it might not be so easy on the wallet however. Do me a favor and let me know if you have any further questions about your vehicle. Thanks for rating my response and for using FixYa!

leave off starter wire or put one in wrong place

Behind the back bumber. Hidden part.

Behind the wind shied. a hidden part. very difficult to detect.

There will be three wires to the switch. with a tester, determine which is hot and jump to one lead then the other. If the switch is bad the window will operate. murf427

the bulb for the back light and brake is in a single bulb so if one is bad the other will keep working take out the bulb and see it in day light you will see one of the springs in the bulb is broken replace this bulb

for right now you must disconnect the positive from the battery. After you must call to the locksmith for a new key. see the diagram attached.

It is really hard to say what this could be, please have the dealer or a shop that knows this make and model look at the problem.

Get a breaker bar and posision it against a chassis rail or something solid. Tap ignition key to start & quickly off. The starter motor will crack the bolt loose for you. Just make sure the bar wil not damage anything (such as radiator but yours front whee drive right? radiator be ok but get my drift.

What color smoke? black = fuel blue = oil white = water. oil is not always milky with head problem if thats what you are getting at. Does it start rough (misfireing) then clear up?

Sounds like a blown head gasket or cracked block allwing coolant into the combustion chamber. I will affect your heater also if the coolant gets low. Check it.__________________________supervag k+can

You do not fix a relayYou use wiring diagrams to see what is inthe circuit your having a problem withIf your testing brings you to a relay,then it can betested or swapped for a similar designed one, tosee if it is working,then purchase a new ,if it is badThe problem with all these internet questions is:People read other posts,then ask about somethingthey have no understanding aboutYou could drive for 60 years & only have a couple offuses blow out. Replacing one won't fix anythingThe odds of 1 relay failing in 60 years is slimThen everyone goes on to replace any number of parts,every time they get a light on their dash & someone tellsthem to go to the parts store for something free & then replacea part based on a code. Your cars systems don't work like thatat allYou need to have a professional at a dealership or repairshop actually spend a half hour with you,then road test the carbefore you leave it. They then have to gather info on your carin order to check it out. It is a step by step process.The repair is easy, as long as you can get to thingsThe diagnosing to find a problem is time consummingYou simple can't get an answer over the internet withouta vehicle to test.

Thats a hard one,it could be a bunch of things sensers,opening,closeing,getting stuck,I am not a mechanic,but I have had about every model made,I have wholesaled many units,and if something would go wrong it happen to me,there is a lot of electronics on that car,there very nice to.It just sounds like a senser not opening or not closeing,Just stuck.I would start in getting a meter put on it while it's running and a complete check out,then you'll be able to have a starting point.They'll be able to tell if it's some kind of electronic problem like a sensor,and there are plenty of those on it.Fuseable link,not working porperly,map sensor,I would start from there.When something shuts down like that,like a sensor ora link,you'll be able to tell.and it is not that exspensive to have done.Call the dealership and ask them how to get the code out of it,sometimes it's like turning the key back an forth like 3 times,a caddillac gives it threw the radio,a chrysler gives it threw the parking light.Etc.sorry I was not to much help.