Question about 1998 Lexus Gs 300

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1998 lexus gs300 low idle when started - 1998 Lexus Gs 300

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 98 lexus gs300 codes p1120 p1121

I wanted to start a thread specifically about failures within the throttle body concerning the GS300 (1998 in my case)

My symptons were:
VSC, VSC OFF, and ENGINE Lights would come on, followed by my car going into Limp Mode, where only that last 25% (if that) of the throttle would respond (basically have to floor the pedal to even move at all).

During the mornings, or when the engine was COLD, the throttle operated normal...then once the car warmed up, usually at about 10 mins, the problem would start...it happened intermitantly at first...1 or 2 days over the course of a week, then it became more consitent, until last week it became a daily problem.

The first part I tried was the Throttle Position sensor, which is on the front side of the throttle body, and the easiest thing to replace...this didnt help at all. $300 part from Lexus, $80 part from RockAuto.com (exacly same part toyota OEM)

THE PART THAT FIXED THE PROBLEM:
===========================================
"Idle Valve Motor", which is the larger electrical object next to the TPS on my 98 GS300. Problem is solved.

The Codes I got were P1120 and P1121 - Accelerator Sensor problem. However it wasnt really the Accelerator Sensor, it was indeed to actual electrical Motor that controls the opening of the Butterfly valve inside the Throttle body.

I found the problem by good old trouble shooting, and using an ohm meter to see if the throttle electric motor was getting elev, I found that the elec motor just to the left of the TPS was basically freaking out and shutting down. The Accelerator Pedal Sensor is on the Back-side of the throttle body where the throttle cable connects to, and has a spring on it. It was fine.

GS300's are indeed "drive by wire" concerning the throttle...the cable triggers the Accel Pedal Sensor, which sends a signal to the ECU, the ECU then sends power to the Idel Valve Elec Motor (next to the TPS), which opens and closes the mechanical butterfly valve, then the TPS sensor detects how far the elec motor is actually opening the butterfly valve...its a closed-loop feed-back system, meaning any failure in any sensor will cause the entire systm to fail.

The throttle cable apparently is ONLY there to allow the fail-safe of having that last 10-25% throttle when the electronic system fails...there is a gearbox inside the throtle body which allows the tail end of the throttle to manually engage the butterfly valve...the rest of the time, the butterfly valve is 100% opened and closed via the idle control motor.

Posted on Jul 08, 2009

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SOURCE: Have 2003 Lexus GS300. Engine turns over, but

sounds like a security isue

Posted on Jan 19, 2010

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SOURCE: 1998 lexus gs300 vsc lights

its you throttle postion sensor i had the same problem

Posted on Feb 06, 2010

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SOURCE: WHAT IS CODE P0715 ON A 2001 LEXUS GS300

P0715 Input/Turbine Speed Sensor Circuit Malfunction

It seems that you may have a problem with your sensor on or in your transmission.

Posted on Jun 03, 2010

Smith-alone
  • 360 Answers

SOURCE: how to change spark plug on lexuse gs300 2003

Hi, You need a new Spark Plugs Spark Plug Wrench Socket wrench Extension (At least 2-3 inch) size 10 socket size 12 socket...
First thing you need to do is find out where the spark plug cover is. Once you figure that out there will probably be size 10 or/and 12 bolts honding it down. Take that off and there you will see sensors connecting to each other and holding the spark plug in the cylinders. Unplug all the sensors and pull out the circular plugs holding the spark plugs down. THey might be a little tight and hard to get out so you're going to need to give it a good tug. Once you pull them out MAKE SURE YOU DONT DROP ANYTHING INTO THE CYLINDERS. You can look down into them and see the spark plugs. Get your spark plug wrench, extension, and socket wrench and stick them down in and push so that the spark plug wrench grabs them. Just simply unscrew the plugs, pull them all out, and then put the next ones in, and tighten them down. Just connect all the sensors, and put the cover back on and you're done. Pretty simple.
Take care

Posted on Jul 23, 2010

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1 Answer

1998 lexus gs300 code p0155


P0155 O2 Sensor Heater Circuit Malfunction (B2S1)
bank 2 ...side one

either the 02 sensor has failed or getting too much voltage

go with replace 02 sensor first

Mar 08, 2017 | Lexus Cars & Trucks

1 Answer

Hi, I have a Lexus gs300 1998 which has been parked up for a while . Starts great but runs high and drinks gass ,any idea ?


Mice living in the air cleaner perhaps? It isn't as daft as it sounds as a car laying undisturbed for a while offers mice a very good home and they love to chew pipes and wiring.

The idle air control could be sticking and damp could have got into the oxygen sensors, or anywhere else...
Good luck!

Feb 21, 2015 | 1998 Lexus Gs 300

1 Answer

Where is the fuse box on a 1998 lexus gs300?


On this website you find fuse box diagram and description for Lexus GS300 (1998 - 2000)

Lexus GS300 1998 2000 fuse box diagram Auto Genius

Jun 02, 2014 | 1998 Lexus Gs 400

2 Answers

99 lexus gs 300 fuse box diagram


We do not have the owners manuals for any model of Lexus. they are not free to download, you must purchase them from Lexus/Toyota

Feb 24, 2012 | 1999 Lexus Gs 300

1 Answer

Where can I purchase a shift solenoid for a Lexus GS300 1998, with the a650 tranny?


You can buy the solenoid in the below link

http://www.lexuspartsnow.com/components/1998-lexus-gs300~shift-lever-retainer-33-12-4413.html

Or if you want to know any nearby store please tel us where you live at to give the nearest location.

Jan 18, 2011 | 1998 Lexus Gs 300

1 Answer

Where on a 1999 Lexus GS300 is the Fuse box diagram


On this website you find fuse box diagram and description for Lexus GS300 (1998 - 2000)

Lexus GS300 1998 2000 fuse box diagram Auto Genius

Nov 26, 2010 | Lexus GS 300 Cars & Trucks

1 Answer

Where is the idle control located on 2000 lexus gs300. my car idle is very low almost down to zero when it starts


they are always on the throttle body by the hose that connects to the throttle body push gas pedal look under hood while doing this and you will see the throttle cable moving on throttle body right around there

Sep 15, 2010 | 2000 Lexus Gs 300

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