RX330 Air Suspension problem - solved
2nd gear
Joined: Dec 2024
Posts: 2
Likes: 0
Hi Nubs.
Using the height switch lower the suspension. You should see a green light on the dash start to flash until the selected height is reached. If it doesn't flash the ECU is in a protect mode. It enters this when too many failed attempts have occured.
When it's at it's lowest (if it wasn't already) select N or H.
At this point you can start your diagnosis.
If there has been a number of failed attempts, the ECU may put it into a freeze and the pump won't run. I found if you start the car then stop it repeatedly for 5 (I think it's 5. It was a while ago) it resets the ECU, and the pump will run.
Things that cause it to fail. Blown pump fuse. Faulty solinoid. Faulty pump.
With the solinoid and pump you can (I did) short the solenoid connections. (Be careful as it has a lot of juice)
So what causes the ECU to stop running the pump: (The ECU is located under the right hand dash)
One of the height sensors being faulty. Indicated by one of the corners not raising. These sensors are around £120/160 but are easily repared if you prefer to do so.
I can run you through how to do this.
Using the height switch lower the suspension. You should see a green light on the dash start to flash until the selected height is reached. If it doesn't flash the ECU is in a protect mode. It enters this when too many failed attempts have occured.
When it's at it's lowest (if it wasn't already) select N or H.
At this point you can start your diagnosis.
If there has been a number of failed attempts, the ECU may put it into a freeze and the pump won't run. I found if you start the car then stop it repeatedly for 5 (I think it's 5. It was a while ago) it resets the ECU, and the pump will run.
Things that cause it to fail. Blown pump fuse. Faulty solinoid. Faulty pump.
With the solinoid and pump you can (I did) short the solenoid connections. (Be careful as it has a lot of juice)
So what causes the ECU to stop running the pump: (The ECU is located under the right hand dash)
One of the height sensors being faulty. Indicated by one of the corners not raising. These sensors are around £120/160 but are easily repared if you prefer to do so.
I can run you through how to do this.
Thanks
Driver
Joined: Dec 2017
Posts: 68
Likes: 13
From: Airdrie
Hi there.
First thing to do is check the small arm connecting the sensor and the chassis isn’t broken.
Also remake the electrical connector.
If all looks ok then remove the sensor from the vehicle.
To test the sensor you will need a multimeter.
Set it to Ohms. Put the negative cable to the middle prong and the positive cable to either of the outer prongs.
You will need to check both outer prongs.
Now move the arm on the sensor.
The resistance should increase and decrease as you move the arm.
The exact resistance is irrelevant.
If either one doesn’t produce a change in resistance then your sensor is faulty.
Before you go buying a new one.
Open it carefully as there’s 3 tiny gold springs inside. The ends of these are prone to corrosion. Give them a gentle rub on both ends with light sandpaper.
I also clean the little scraper prongs.
Also clean the tracks using a spirit.
Now test again.
Good luck.
First thing to do is check the small arm connecting the sensor and the chassis isn’t broken.
Also remake the electrical connector.
If all looks ok then remove the sensor from the vehicle.
To test the sensor you will need a multimeter.
Set it to Ohms. Put the negative cable to the middle prong and the positive cable to either of the outer prongs.
You will need to check both outer prongs.
Now move the arm on the sensor.
The resistance should increase and decrease as you move the arm.
The exact resistance is irrelevant.
If either one doesn’t produce a change in resistance then your sensor is faulty.
Before you go buying a new one.
Open it carefully as there’s 3 tiny gold springs inside. The ends of these are prone to corrosion. Give them a gentle rub on both ends with light sandpaper.
I also clean the little scraper prongs.
Also clean the tracks using a spirit.
Now test again.
Good luck.
2nd gear
Joined: Dec 2024
Posts: 2
Likes: 0
Hi there.
First thing to do is check the small arm connecting the sensor and the chassis isn’t broken.
Also remake the electrical connector.
If all looks ok then remove the sensor from the vehicle.
To test the sensor you will need a multimeter.
Set it to Ohms. Put the negative cable to the middle prong and the positive cable to either of the outer prongs.
You will need to check both outer prongs.
Now move the arm on the sensor.
The resistance should increase and decrease as you move the arm.
The exact resistance is irrelevant.
If either one doesn’t produce a change in resistance then your sensor is faulty.
Before you go buying a new one.
Open it carefully as there’s 3 tiny gold springs inside. The ends of these are prone to corrosion. Give them a gentle rub on both ends with light sandpaper.
I also clean the little scraper prongs.
Also clean the tracks using a spirit.
Now test again.
Good luck.
First thing to do is check the small arm connecting the sensor and the chassis isn’t broken.
Also remake the electrical connector.
If all looks ok then remove the sensor from the vehicle.
To test the sensor you will need a multimeter.
Set it to Ohms. Put the negative cable to the middle prong and the positive cable to either of the outer prongs.
You will need to check both outer prongs.
Now move the arm on the sensor.
The resistance should increase and decrease as you move the arm.
The exact resistance is irrelevant.
If either one doesn’t produce a change in resistance then your sensor is faulty.
Before you go buying a new one.
Open it carefully as there’s 3 tiny gold springs inside. The ends of these are prone to corrosion. Give them a gentle rub on both ends with light sandpaper.
I also clean the little scraper prongs.
Also clean the tracks using a spirit.
Now test again.
Good luck.
Thank you for your support, I will definetely remember it if it happens again.
Driver
Joined: Dec 2017
Posts: 68
Likes: 13
From: Airdrie
Don’t don’t don't buy one from Lexus. I think they charge around £160
They will only sell you the full setup, sensor and all. Not the bar.
Before you remove the broken one, if you haven't already, measure the distance between the 2 nuts that secure the bar. You can use this to setup the knew one.
You can also get this size from the other side.
You can get the bar and the ball ends from Ebay. Works out about £10. Sorry I can't remember the bar's diameter. From memory I think M6 or 8
When you order make sure both ends are opposite threads. Left and right.
They will only sell you the full setup, sensor and all. Not the bar.
Before you remove the broken one, if you haven't already, measure the distance between the 2 nuts that secure the bar. You can use this to setup the knew one.
You can also get this size from the other side.
You can get the bar and the ball ends from Ebay. Works out about £10. Sorry I can't remember the bar's diameter. From memory I think M6 or 8
When you order make sure both ends are opposite threads. Left and right.
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JAndersson
LS - 1st and 2nd Gen (1990-2000)
6
Oct 12, 2009 02:19 PM
330, adjustable, air, air suspension, aire, bag, de, height, lexus, performance, problem, problems, rx, rx330, solution, suspension
