Air Suspension Problems or Questions
#121
I've owned my '04 GX since October 2003 now with 165k. I'm not experiencing any issues with air shockes but I also do not tow anything more than once a year. I do however load hit up with people and supplies in the back multiple times a year. I'm not having any issues with the air shocks. I check with my mechanic who use to work for Lexus to make sure I don't have any issues down the road. So far it's great with only the normal wear tear issues of brakes windshield wipers and light bulbs.
#122
Lexus Champion
Break
Out
Another
Thousand
#123
Just dropped it off. Reminded them that I thought 4 hours labor at 125/hour was a bit high in the first place....they are a pretty honorable dealership, They offered me a free loaner which I did not need, I told them thanks, just fix the truck!!! Let you all know tomorrow what the verdict is. Maybe just a ECU programming thing.
#124
Just picked it up, all they did was recheck for error codes...none. So I found this post..
.Only one important thing the dealer should remember that there is Code DTC C1735 is not removed and it should be retained in the Suspension Control ECU.
And I showed it to them...they obviously remove all codes. I asked if this one should remain? Height control works properly from switch, no blinking light. If suspension is at normal height when I turn it off, it is still there in the morning. But I am losing height while driving and the system does not bing it back up unless I do it manually, or a shut off engine and restart, compressor raises is. What is this DTC C1735 code? How does it figure into the problem. Are sensors not communicating with ECU? Can it still be sensors without fault codes? They told me to bring it back next week. They are short handed due to snow storm..,
.Only one important thing the dealer should remember that there is Code DTC C1735 is not removed and it should be retained in the Suspension Control ECU.
And I showed it to them...they obviously remove all codes. I asked if this one should remain? Height control works properly from switch, no blinking light. If suspension is at normal height when I turn it off, it is still there in the morning. But I am losing height while driving and the system does not bing it back up unless I do it manually, or a shut off engine and restart, compressor raises is. What is this DTC C1735 code? How does it figure into the problem. Are sensors not communicating with ECU? Can it still be sensors without fault codes? They told me to bring it back next week. They are short handed due to snow storm..,
#125
Lexus Champion
Not sure what the problem is but I'm attaching a zip file w/ PDFs for you to read through that deals with code C1735, which the code is:
DTC C1735/35 : EXHAUST SOLENOID VALVE CIRCUIT
DTC C1735/35 : EXHAUST SOLENOID VALVE CIRCUIT
#126
Pole Position
...system does not bing it back up unless I do it manually, or a shut off engine and restart,
#127
C1744 AND C1761 were on the original work order that led them to the ht control tank/solenoid.
#128
Lexus Champion
#129
Well that would lead them to the reservoir and solenoid...but it it is still winding up on the bump protectors while driving...Sometimes.....is it possible it is still the height sensors even though they show no codes or blinking dash light? I was stopped at a light and out of curiosity tried to put it in L...the light never even blinked, it just lit up the L..because it was already down. Pushed up and it went......
#130
Lexus Champion
Well that would lead them to the reservoir and solenoid...but it it is still winding up on the bump protectors while driving...Sometimes.....is it possible it is still the height sensors even though they show no codes or blinking dash light? I was stopped at a light and out of curiosity tried to put it in L...the light never even blinked, it just lit up the L..because it was already down. Pushed up and it went......
Left: C1714
Right: C1713
It doesn't appear that you have a bad sensor(s) since you said you pressed "HI" and the rear lifted up.
- When the suspension control ECU detects a malfunction in the height control sensor, the height control indicator lamp ”N” comes on or blinks, and the height control switch (”HI” and ”LO”) is suspended.
- When either one of the right or left height control sensor sub−assy is faulty, the suspension control ECU uses the other one (functioning one) to adjust the vehicle height to the normal height.
- When both of the height control sensor sub−assy are faulty, the suspension control ECU suspend the height control function immediately.
EDIT:
Based on what I can find here are the main problem areas that would cause what you're experiencing:
- Air leakage
- Clogging of the air tube
- Height control sensor link sub−assy (Ride height sensor linkage)
- Height control sensor circuit (Ride height sensor)
- Gate solenoid valve circuit
- Suspension control ECU
Last edited by RCsGX; 01-22-14 at 07:08 PM.
#131
The codes for bad ride height sensors are:
Left: C1714
Right: C1713
It doesn't appear that you have a bad sensor(s) since you said you pressed "HI" and the rear lifted up.
EDIT:
Based on what I can find here are the main problem areas that would cause what you're experiencing:
Left: C1714
Right: C1713
It doesn't appear that you have a bad sensor(s) since you said you pressed "HI" and the rear lifted up.
- When the suspension control ECU detects a malfunction in the height control sensor, the height control indicator lamp ”N” comes on or blinks, and the height control switch (”HI” and ”LO”) is suspended.
- When either one of the right or left height control sensor sub−assy is faulty, the suspension control ECU uses the other one (functioning one) to adjust the vehicle height to the normal height.
- When both of the height control sensor sub−assy are faulty, the suspension control ECU suspend the height control function immediately.
EDIT:
Based on what I can find here are the main problem areas that would cause what you're experiencing:
- Air leakage
- Clogging of the air tube
- Height control sensor link sub−assy (Ride height sensor linkage)
- Height control sensor circuit (Ride height sensor)
- Gate solenoid valve circuit
- Suspension control ECU
True system works normally from dash switch.. And if I park the car overnight and the suspension is at correct height, it is still there in the morning...so a leak? It is dropping while I am driving and sometimes correcting itself. I hear the pump while waiting at a light. .I will take your list with me when I bring the car back next week..thanks.
#134
Driver School Candidate
Join Date: Jan 2014
Location: Oregon
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As soon as you go over a big dip and your rear end drops the spring can easily pop out. Once you remove the airbag there nothing there to secure the bottom of the spring in place. Just a little word of advice, read up on other sites regarding the airbag / spring swap in our GX. I have and I can tell you its not as simple as removing the airbag and adding a spring.
Look at the spring picture in post #19, noticed theres NOTHING keeping the bottom spring in place.
read post #20 and read his response # 29. You need something to keep the spring in place.
Look at the spring picture in post #19, noticed theres NOTHING keeping the bottom spring in place.
read post #20 and read his response # 29. You need something to keep the spring in place.
#135
Lexus Champion
This needs a little clarification. The bottom of the spring does not need to be secured to the axle, Toyota has had the floating spring design since the FJ80 series Land Cruiser in 1991. The current air bag system in the GX470/460 also floats on the axle and frame, there is nothing keeping it from coming out except for a tiny clip on the frame. Toyota has designed the suspension where the shock is the limiting factor, the spring/air bag simply cannot come out unless the shock out travels the springs/air bag. As long as you have the proper shock matched with the coil spring everything will stay in place.