Question about 1991 Lexus LS 400

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Ls400 indicator lights coming on

My 1990 ls400 low engine oil level, discharge warning, low engine coolant warning lights - all come on at same time like yours.

Have you found a solution. My alternator stops charging when this happens.

Thank you
psieng@bellsouth.net
225-819-6589

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  • essibrah Feb 19, 2009

    Car was OK the previous night. Following morning, the battery discharge light, brake light, oil light, engine coolant light all come on when I step on the accellerator. Intermittently the ABS light come on. However while accelerating, when I step on the brake, all the warning lights go off. Please get in touch if you have a solution.
    Thank you.

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You need a new alternator

Posted on Mar 27, 2009

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Why would the oil light stay on?


That depends on the type of oil warning light being displayed. There are 2 types of warning lights

1. Low oil pressure light which all cars have
2. low oil level light which some cars have.

Low OIL PRESSURE warning means the oil pressure is below minimum and when this happens there will be insufficient lubrication of many engine parts because sufficient oil cannot get to all parts of the engine it is required to lubricate. Until the cause is identified and rectified the warning light will remain. If you run your engine with low oil pressure you will cause expensive damage to internal engine components.

Low OIL LEVEL warning means the oil in the sump has dropped to a dangerously low level (which may be due to an oil leak or abnormal oil consumption by the engine.) This warning means the oil level needs to be topped up and the warning will stay displayed until you top up the oil. Running the engine with low oil will cause expensive engine damage.
Since it is a 2 minute job, Oil levels should be checked fortnightly as a minimum, together with radiator coolant and power steering fluid levels, if you run the car most days each week as most people do.

It is possible for a warning light to remain displayed when the cause has been dealt with because there is a problem with the sender unit. However it needs to be established with alternative checks that the problem has been fixed before investigating if there is a problem with the warning light itself.

Nov 21, 2015 | Cars & Trucks

2 Answers

OIL LIGHT KEEPS COMING ON?


See my answer to your related/same question which I include again for your reference:
You must immediately check your engine oil level and take appropriate action: unless you have a defective oil pressure sensor, oil pressure light usually indicates that your engine oil is not flowing properly. Some possible issues: low oil level (leaking engine?), blocked oil filter (when did you last get your car service) or defective or blocked oil pump due to excessive dirty engine oil.
Also check under your car to see if you have any oil leaks: this usually indicate that you have defective engine gaskets or oil seals causing your oil (pressure) warning light to come on.
Hope it is of assistance. But I would consult a motor mechanic asap as you engine could soon fail due to the lack adequate oil lubrication.

Apr 06, 2014 | 2007 Pontiac Grand Prix GXP Sedan

1 Answer

Jetta Warning Light


It says that your vehicle is low on coolant.Get the coolant level checked.If low has to be changed.

------------Check out few help links related to your issue.Click the link below:---


Service 4wd warning light on Dash? http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html

---------
Car Turns OFF due to low oil pressure warning light? http://schematicsdiagram.blogspot.com/2011/12/car-turns-off-due-to-low-oil-pressure.html

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Hybrid warning Light ON? http://whatisbyme.blogspot.in/2012/05/2005-toyota-prius-hybrid-warning-light.html

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Order Coolant Bypass Tube? http://whatisbyme.blogspot.in/2012/05/1991-toyota-camry-order-coolant-bypass.html

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Coolant Leak? http://technoanswers.blogspot.in/2012/04/1994-toyota-camry-coolant-leak.html

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COOLANT LEAK AT DRIVER SIDE NEAR FIREWALL? http://schematicsdiagram.blogspot.in/2012/04/2006-cadillac-dts-coolant-leak-at.html
----------
MAF, IAT, MAP and Coolant Level Sensor problem all together? http://schematicsdiagram.blogspot.com/2011/12/maf-iat-map-and-coolant-level-sensor.html

----------
Engine Coolant Temperature (ECT) Sensor Replacing? http://schematicsdiagram.blogspot.com/2011/12/gmc-engine-coolant-temperature-ect.html Loosing Coolant? http://whoisbyme.blogspot.in/2012/06/loosing-coolant.html
---------- Coolant temperature sensor dies again and again?


http://schematicsdiagram.blogspot.com/2012/01/coolant-temperature-sensor-dies-again.html
----------- Where to Add Coolant? http://repairhelpcenter.blogspot.in/2012/06/2000-daewoo-lanos-where-to-add-coolant.html
-----------
------------ Blue Water Warning Light on Dash? http://whatisbyme.blogspot.in/2012/07/blue-water-warning-light-on-dash.html

--------------

Oct 09, 2012 | 1995 Volkswagen Jetta

1 Answer

A light come on with a box with arrow pointing down looks like waves what does it mean


This indicates a low level of coolant in the coolant bottle/resevoir..... this symbol represents the radiator or coolant system liquid level.

Warning comes on to warn of coolant level too low.

When the engine is cold...remove the cap and check level. Add 50/50 antifreeze/water to level indicated on the side of the coolant bottle or tank.

Reservoir Bottles/tanks are usually transparent and you can see the coolant level through the plastic.

When coolant topped off to correct level, lamp will go out automaticly...no need for scanner or shop to turn it off. It will come on as a 'self check' when you turn on the ignition and if level is okay will go out when engine starts.

Sep 13, 2011 | 2004 Chevrolet Cavalier

2 Answers

I changed my oil two days ago. the oil light pops up only when i stop or breaking. Why is it doing this?


engine damage
low oil level
incorrect oil
low oil pressure
bad oil pressure switch
bad engine ground
bad oil pressure switch connection or wiring
incorrect or clogged oil filter
incorrect idle speed

Aug 02, 2011 | 2005 Chevrolet Aveo

1 Answer

On a 2001 ford taurus what is the exclamatin point on the dash? The light comes on and goes off at times.


Hope this helps.
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Item Part Number Description 1 — Instrument cluster 2 — Odometer reset shaft 3 — Air bag warning indicator 4 — RH turn signal indicator 5 — Charging system warning indicator 6 — Tachometer 7 — Low oil pressure warning indicator 8 — Brake system warning indicator 9 — Cruise control indicator 10 — Check fuel cap indicator 11 — Anti-lock brake system (ABS) warning indicator 12 — Check transmission indicator 13 — Odometer 14 — Transmission range selector indicator 15 — Trip odometer 16 — Theft indicator 17 — Low coolant indicator (if equipped) 18 — Safety belt warning indicator 19 — Low fuel warning indicator 20 — Fuel gauge 21 — Malfunction indicator lamp (MIL) 22 — Door ajar warning indicator 23 — Traction control indicator (if equipped) 24 — Engine coolant temperature gauge 25 — High beam indicator 26 — LH turn signal indicator 27 — Speedometer

Jun 05, 2010 | 2001 Ford Taurus

3 Answers

Where to add coolant for radiator on a 95 vw jetta?


Add Coolant to spherical reservoir at right rear of engine compartment as viewed from front. If it is low the coolant gauge flashing light will warn you of a low condition.

Jan 01, 2010 | 1995 Volkswagen Jetta

3 Answers

Coolant level low light comes on and coolant level is not low in reserve tank or radiator.


There is a TSB for this problem. Here it is.


Bulletin No.: 04-06-02-007

Date: August 11, 2004

TECHNICAL

Subject:
Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination)

Models:
2000-2002 Buick Century, Regal
2000-2001 Chevrolet Lumina
2000-2002 Chevrolet Impala, Monte Carlo
2000-2002 Pontiac Grand Prix
2000-2002 Oldsmobile Intrigue


Condition

Some customers may comment that the low engine coolant level indicator is always illuminated.


Cause

The cause of this condition may be due to engine oil contaminating the coolant. Possible sources of oil contamination are internal engine leaks, improper service procedures, or the addition of some types of anti-leak additives to the cooling system. Once in the coolant, the oil leaves deposits on the level sensor creating an insulating film. This film results in a false activation of the coolant level indicator.


Correction

Diagnose low coolant level system operation and check the sensor for oil contamination using the procedure listed below.


Important: No coolant supplements should be used in GM cooling systems, other than what is approved and recommended by GM. The use of "aftermarket" over-the-counter sealing and cooling supplements may affect the operation of the low coolant level sensor. Discoloration of the coolant recovery bottle is normal and does not necessarily indicate that coolant contamination is present. Flush cooling system only when instructed by this bulletin.

1. Verify that the coolant is at proper level in the radiator and the coolant recovery bottle. If the coolant is low, add proper amount of 50/50 water and DEX-COOL(R) mixture. If the low coolant light operates properly, diagnose the cooling system for loss of coolant as outlined in SI. DO NOT proceed further with this bulletin.

2. Remove the low coolant level sensor. Refer to Coolant Level Module Replacement in the Engine Cooling sub-section.

3. With the key on, the engine off and the coolant level sensor disconnected from the vehicle wiring harness, observe the low coolant light:


^ Light is on - Chassis wiring or instrument cluster concern. Follow the appropriate diagnostic information in SI.

^ Light is out - Proceed to Step 4.



4. With the key off, connect the coolant level sensor into the vehicle's wiring harness. Connect a ground wire (1) to the battery negative terminal. Using a sharp probe (3) attached to the ground wire, ground the coolant sensor probe (2) as shown in the illustration. Make sure a good contact is made. With the key on and the engine off, observe the low coolant light for at least 15 seconds.


^ Light is on - Replace the low coolant sensor and re-check system operation.

^ Light is out - Proceed to Step 5.


5. Using a small wire brush or emery cloth, polish the low coolant level sensor probe to remove any film or oxidation. The probe should be a bright brass color when finished. Use Brake Parts Cleaner to flush removed deposits from the low coolant sensor probe. Re-install the low coolant sensor into the vehicle and proceed to Step 6.

6. Flush the cooling system and install new DEX-COOL(R) mixture as outlined in the SI. Check the vehicle's warranty history to determine if any engine gasket had recently been changed. If there has not been a recent gasket replacement, locate and repair the source of the engine oil contamination.


Oct 31, 2009 | 2002 Chevrolet Monte Carlo

1 Answer

What is the check gauges light


CHECK GAGES light (1) indicates a potential engine failure(low oil pressure, low coolant, coolant overheating) has occurred.
· Check gages and shut down engine. Gages should read as follows: Oil pressure 5 to 10 psi (34 to 69 kPa) at idle; Water Temp gage below 230 degrees (110 C).
· Check engine oil level (Para 2-11) if OIL PRESS gage indicates low reading. Check coolant level (Para 2-11) if Water Temp gage indicates high reading. Notify Unit Maintenance if levels are low.

If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance


Oct 16, 2009 | 1999 GMC Jimmy

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