send help with codes on 2003 gs300!
Thread Starter
Driver School Candidate
Joined: Oct 2016
Posts: 12
Likes: 8
From: Ca
send help with codes on 2003 gs300!
First time poster long time lurker.
Ive got a 2003 GS300 Sport design with 180K and a few codes Ive been meaning to get resolved..
P0505 - Idle Air Control
P0171 & P0174 - Air/Fuel Mixture system too lean banks 1 & 2
On the Idle air control(P0505) I've already clean the MAF and throttle bottle thoroughly but the code came back after a few miles.. not sure what to look for next and grateful for any experiences/help!
The system running too lean makes me think maybe I need new O2 sensors? I swear I've smelled gas in the cabin on occasion so I'll be checking for leaks under the hood with some soapy water.. anyone had and resolved these?
Trying to give this thing some new life so next week ill be..
Putting new iridium plugs @ ngk wires,
New valve cover gaskets & new PCV valve
New fluid/filter/gasket on tranny & new oil pan gasket,
New lock actuator motors & AC servos.
Ive got a 2003 GS300 Sport design with 180K and a few codes Ive been meaning to get resolved..
P0505 - Idle Air Control
P0171 & P0174 - Air/Fuel Mixture system too lean banks 1 & 2
On the Idle air control(P0505) I've already clean the MAF and throttle bottle thoroughly but the code came back after a few miles.. not sure what to look for next and grateful for any experiences/help!
The system running too lean makes me think maybe I need new O2 sensors? I swear I've smelled gas in the cabin on occasion so I'll be checking for leaks under the hood with some soapy water.. anyone had and resolved these?
Trying to give this thing some new life so next week ill be..
Putting new iridium plugs @ ngk wires,
New valve cover gaskets & new PCV valve
New fluid/filter/gasket on tranny & new oil pan gasket,
New lock actuator motors & AC servos.
I've never experienced those combinations of codes, but I'd focus more on the idle air control. Being that the 171 and 174 are lean codes for separate banks means (imo) that something in "front" of the combustion system (iac) is the issue rather than the rear (o2 sensors) Its not commonality for an o2 sensor from both banks to go bad at the same time.
They're both reading lean meaning that, well, the car actually IS running lean. This could be caused by that iac malfunctioning. It's probably letting in more air than the ecu is reading. I believe this is actually the motor on the throttle body assembly itself. Instead of cleaning the maf, try cleaning the butterfly in the TB and see if it helps. There could be some carbon build-up causing it to not close completely or accurately while in idle.
They're both reading lean meaning that, well, the car actually IS running lean. This could be caused by that iac malfunctioning. It's probably letting in more air than the ecu is reading. I believe this is actually the motor on the throttle body assembly itself. Instead of cleaning the maf, try cleaning the butterfly in the TB and see if it helps. There could be some carbon build-up causing it to not close completely or accurately while in idle.
Thread Starter
Driver School Candidate
Joined: Oct 2016
Posts: 12
Likes: 8
From: Ca
Ive already completely taken off the throttle body and cleaned cleaned it inside and out butterfly included.
This has been confusing me because..
The motor attatched to the throttle body is the part number 89672-30020
and is called the "throttle control motor" on Lexuspartsow but the same part is called the "idle air control valve" on Rockauto. Am I able to just swap the motor out? Could of sworn I saw someone said it needs to be calibrated.
Thanks for the help.
This has been confusing me because..
The motor attatched to the throttle body is the part number 89672-30020
and is called the "throttle control motor" on Lexuspartsow but the same part is called the "idle air control valve" on Rockauto. Am I able to just swap the motor out? Could of sworn I saw someone said it needs to be calibrated.
Thanks for the help.
Yes it can be swapped out. I dont think any extensive calibration is needed other than maybe resetting the computer. under my understanding, the TPS is the only one that has a calibration ability as I've changed it all before, one at a time as they each failed throughout the years 
Usually you get a 1120 or 1122 code though (I think that was the code) or was it 2101? DAMN MY DYSLEXIA!
Usually you get a 1120 or 1122 code though (I think that was the code) or was it 2101? DAMN MY DYSLEXIA!
Thread Starter
Driver School Candidate
Joined: Oct 2016
Posts: 12
Likes: 8
From: Ca
It's too bad there arent any 2gs in the salvage yards near me or else I'd pull one off to test it. I guess I'll order the throttle motor controller and update if it makes a difference after.
fingers crossed this will be the last headache for a few thousand miles lol.
fingers crossed this will be the last headache for a few thousand miles lol.
frickin work the ebay pages man! Cross reference searches and everything. I found a guy selling his TB with no sensor (but the motor was still there) and he was asking only $50 bucks shipped LoL Dude didnt know what he had. Don't limit your searches to just the motor and don't limit your searches to the 2GS, there are plenty of cars with the same engine in it. 
(if you don't mind used that is)
(if you don't mind used that is)
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