Question about 1994 Lexus GS 300

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Engine light blink code 21 on 94 gs300

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SOURCE: 94 gs300

Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...

Posted on Sep 18, 2008

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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

  • 163 Answers

SOURCE: changed battery in 94 lexus GS300, now the check

try to take cables off battery let sit for five or tem min. then put + on first

Posted on Jan 01, 2010

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


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)

Nov 18, 2014 | 1990 Lexus LS 400

1 Answer

I have a 1995lexus gs300 loss power what is it when im driving


So many things see first if the check engine light is On if yes
diagnose with tester and read the error code
let me know for help

Jul 19, 2014 | Cars & Trucks

1 Answer

Vsc/vsc off check engine light gs300


go get your codes read. sounds like possible misfire due to lack of power. call around alot of places read codes for free then you can start there.

Jul 18, 2012 | 2001 Lexus Gs 300

1 Answer

2006 GS300 Lexus has a check system light on? What does this mean?


Some luxury Models are equipped with standard emission lights. Try removing the battery cables for 20 mins of so with the vehicle off. Reconnect and start engine. Drive it for a little while. If the light is gonna come back on it will likely do it in under 10 miles. If it comes back on, have you car scanned for trouble codes.

Jun 13, 2011 | 2006 Lexus Gs 300

2 Answers

My 1995 lexus gs300 checx enge light and trac light come on and stay on ,it go back to normal if i take out the fuse and put it back in.


Yes, this is correct performance for your light, BUT the issue remains, as you know, because the light comes back on. You need to get a code reader, pull the codes and proceed on that indication. REMEMBER the codes are a CLUE and not necessarily the answer.... A vacuum leak, for example, would throw an error code of lean, miss fire, and oxygen sensor, and possibly other codes....

Mar 20, 2011 | 1995 Lexus GS 300

1 Answer

1999 gs300 shows code p1349 and the engine runs really rough at idle , runs fine off idle


Its a Oil Control Valve most likely. Get the valve. Its like 100 from Lexus. Mine did the exact same thing with that code. GS300

May 19, 2010 | 1999 Lexus ES 300

1 Answer

ENGINE LIGHT IS ON, CAR BURNS ALOT OF GAS. SLIGHT


You don't have a simple problem. Engine light has to be read by a scanner (OBDII) available at autoparts store. Or take to mechanic. After you get code you'll have to be a mechanic to fix problems. Burns lots of gas can be many different causes. Miss in motor, same. Please take to professional if this is beyond your knowledge. Good luck!

Mar 17, 2010 | 2000 Lexus Gs 300

1 Answer

Changed battery in 94 lexus GS300, now the check


try to take cables off battery let sit for five or tem min. then put + on first

Jan 01, 2010 | 1994 Lexus Es 300

1 Answer

Check engine lite


Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you should have the car diagnosed and repaired. First step is to find out what code turned the light on.

Feb 09, 2009 | 2003 Lexus RX 300

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