Top 10 1990 Lexus LS 400 Questions & Answers

1990 Lexus LS 400 Logo

Question

  • 2,258 People Helped

all dash warning lights came

all dash warning lights came on while driving. oil light, brake light, coolant light, battery light. car continued to run. once home turned off and now wont start. warning lights still come on and car makes a clicking sound. 1991 lexus ls 400

Posted by on

Answer

  • Most Helpful of 1 Answers

Hatterasnc,

You're alternator has gone bad and the vehicle was running on battery power. The "clicking" sound is your now dead battery that does not have enough power to turn over the starter. You might also want to check your power steering pump for leak. This is a know problem with early LS400s and will most likey be the cause of the alternator failure. I just dropped $1050.00 to fix the very same promblems you have.

Posted on Jul 21, 2008

Question

  • 2,024 People Helped

1990 Lexus LS400 won't start. No check engine light.

I have spark to all my spark plugs. I used injector test lights and wasable to confirm that my injectors are firing. I have checked the timingand it is correct. I have excellent fuel pressure. There are no errorcodes present.

When I crank the engine the engine might run fora fraction of a second. If I spray starter fluid in the intake the carwill run on the starter fluid.

If I disconnect the cam positionsensor(s) then the car won't even make an attempt to start. If I plugthem back in then the car will fire up but as soon as I let off the keythe engine dies.

I was going to swap out the MAF sensor but Itried starting another Lexus with the MAF unplugged and that onestarted fine. If I unplug mine it still doesn't start

The fuel pump relay operates correctly. Power is supplied to the fuel pump when the starter is engaged and will continue to run if the motor is "running" When you let off the key and the starter disengages the fuel pump will run until the engine stops moving

Posted by on

Answer

  • Most Helpful of 1 Answers

check the fuel filter or the air filter they may be clogged and check fuel pressure

Posted on Nov 12, 2008

Question

  • 1,675 People Helped

lexus ls 400 air suspension stop working

greenlight flashing mean error in the system somewhere help if you can thank you god & god bless

Posted by on

Answer

  • Most Helpful of 2 Answers

If this light is flashing, there is a problem somewhere in your air suspension system. You can check to make sure its powered on in the trunk on the driver side. Behind the carpeting. This is a common issue with that particular year and model. The system tends to go bad righ around the 15 year old mark or so. Also if the light is flashing, the system is not working. Your just riding on the regular suspension.


Hope it helps

Posted on Feb 19, 2009

Question

  • 1,597 People Helped

How do I fix code 13 engine speed sensor Above 1000 rpm

How do I fix code 13 engine speed sensor Above 1000 rpm

Posted by on

Answer

  • Most Helpful of 1 Answers

Clearing the codes is simple that is done by removing the fuse of the EFI from junction box 2 for 10 seconds. Make sure to remove the jumper wire and switch the key off before clearing the codes.

Here are some common Lexus vehicles 1990-1995 codes:

Code 12 and Code 13 Rpm signal circuit fault
Code 14 Igniter signal circuit fault
Code 16 ECT control signal fault
Code 21 and Code 28 Main oxygen sensor fault (for ES300; SC300 & GS300 models)
Code 22 Coolant temperature circuit fault
Code 24 Intake temperature sensor circuit fault
Code 25 and Code 26 Air fuel ratio fault (for ES300 & SC300 models)
Code 27 Sub-oxygen sensor circuit fault (for ES300 CA & GS300 models)
Code 31 Low airflow meter voltage (for ES300 and GS300 models)
Code 32 High airflow meter voltage (for ES300 model)
Code 35 Barometric pressure sensor circuit fault (for GS300 & SC300 models)
Code 41 and Code 47 Throttle position sensor circuit fault
Code 42 Vehicle speed sensor circuit fault
Code 43 Starter signal
Code 51 Switch condition signal fault (for ES300; GS300 & SC300 models)
Code 52 Code 52 and Code 55 Knock sensor circuit fault
Code 71 EGR system circuit fault (for ES300; GS300 & SC300 models)
Code 78 Fuel pump control circuit fault (for GS300 & SC300 models)

Posted on Nov 18, 2014

Question

  • 1,355 People Helped

my lexus ls400 cranks over but wont start also the car goes dead

my lexus ls400 cranks over but wont start also after a while of cranking over the car goes dead

Posted by on

Answer

  • Most Helpful of 1 Answers

this could be a starter or the enigtion swicth yes if you crank the key to long it will kill the battery.

Posted on May 05, 2010

Question

  • 1,041 People Helped

1990 lexus ls 400 security system went off now

1990 lexus ls 400 security system went off now vehicle will not start. Keys open door turn alarm off but starter will not engage. What can I do?

Posted by on

Answer

  • Most Helpful of 1 Answers

Your alarm is keep your system from starting. When the alarm system fails, you have 1 of two choices, if it is a after market alarm then just disconnect the alarm, if it is a manufacture alarm then you will need to take it to a company to have then replace the alarm or disconnect it. Doing so yourself you can hurt your vehicle more then help it

Posted on May 17, 2010

Question

  • 1,009 People Helped

My lexus ls 400 has no power but it is running.

My lexus ls 400 has no power but it is running. What's the problem.

Posted by on

Answer

  • Most Helpful of 2 Answers

The first thing to have checked is the fuel pressure, low pressure kills the power.

Posted on Feb 06, 2012

Question

  • 923 People Helped

Looking for fuse box for cig.lghtr on 90 Lexus LS400

I am looking for the lighter fuse, lighter outlet is not working, want to use my charger and laser detector.

Posted by on

Answer

  • Most Helpful of 1 Answers

the fuse for the cig. lighter is a 15amp fuse,its located under the streering wheel,on the left side,its under there,you'll see a black box wit the fuse indicators on it.

Posted on May 18, 2010

Question

  • 908 People Helped

I have a 93 Lexus LS 400 and the RPM gauge does

I have a 93 Lexus LS 400 and the RPM gauge does not work, the speedometer only works some of the time. At times it is hard to turn the wheel if I am backing out or pulling in somewhere. Also there is a read warning light that stays on, it is a circle and it has dashed on either side and there is an orange light that looks like the top of the state capital (to me) that goes on and off. Can someone help?

Posted by on

Answer

  • Most Helpful of 1 Answers

trans problem

Posted on Mar 01, 2009

Question

  • 841 People Helped

how to remove headrest of a 1990 lexus LS400 power

how to remove headrest of a 1990 lexus LS400 power seats, can you help please!!!

Posted by on

Answer

  • Most Helpful of 1 Answers

On both sides of the headrest spokes are little adjuster rings. Adjust the headrest up to the highest position. Push down on both of the adjuster rings. While doing that, pull up on the headrest and it will pop right up. Here is a link to help you with all other questions: http://www.clublexus.com/forums/ls400/18383-trying-to-remove-front-seat-headrest-on-ls400-dont-want-to-break-it.html

Posted on Apr 26, 2011

394 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

1991 Lexus LS 400
1991 Lexus LS 400

516 Questions

1994 Lexus LS 400
1994 Lexus LS 400

240 Questions

1996 Lexus LS 400
1996 Lexus LS 400

171 Questions

1995 Lexus LS 400
1995 Lexus LS 400

151 Questions

1998 Lexus LS 400
1998 Lexus LS 400

91 Questions

Top Lexus Experts

Marvin
Marvin

Level 3 Expert

85020 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Are you a Lexus Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

1990 Lexus LS 400 LS 400

  • 1990 Lexus LS 400 LS 400

Most Popular Question

que puedo hacer con mi lexus ls 400 de

  • Cars & Trucks
Loading...