Question about 1999 Lexus Gs 300

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AC light is blinking on a 1999 lexus gs300. blows

AC light is blinking on a 1999 lexus gs300. When Auto button is depressed, it blows cool for about 15 seconds. Then turns to hot air and "A/C" light starts blinking

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6ya6ya
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Posted on Jan 02, 2017

  • 1861 Answers

SOURCE: HAVE A CODE PO446 1999

P0446 is an evap code. Most likely, you need to change the charcoal canister vent valve (CCV) under the trunk floor. Fuel cap codes set 3 codes at once, P0440. P0441 and P0446, all at the same time.

Posted on Sep 10, 2008

  • 1 Answer

SOURCE: Replacing water pump in 98 Lex GS300

Removal of the crankshaft front pulley/damper can be removed without any damage being caused to the cam belt.
They are a good fit on the shaft, I personaly use a lead tup, weighs 2lbs and will not damage anything if used properly.
Tap equaly all the way round the pulley, that should be ok.

Posted on Jan 12, 2009

emissionwiz
  • 75807 Answers

SOURCE: 1992 Lexus SC300 Air Condtioner blowing cool/warm

the system is low on charge, it has a leak, repair the leak and recharge

Posted on Jun 17, 2009

  • 1 Answer

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

  • 98 Answers

SOURCE: how to turn off lexus gs300 1999 DRL lights

Easier said then done also not a good idea for the insurance if an insurer dont see these working upon inspecting your rates can go up these are hard wired into the cars electrical system for security reasons but you can talk to a electro mechanic and it will cost about 45$ for the job and can be disconnected

Posted on Apr 03, 2010

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