Air Suspension Leak
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7th Gear
Joined: Jun 2022
Posts: 7
Likes: 1
Air Suspension Leak
Hey folks I'm relatively new to the LR3 and could use some guidance. I've got a small leak in the air suspension somewhere. I'm getting these two errors:
This one is permanent:
U0132-87 (28) Lost communication with ride level control module - Bus signal/message failure - missing a message
This one comes and goes:C1A20-64 (2E) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure
I did the overnight drop test and got these results:
Front left -1"Front right -3/4"Back left -1"Back right -1/2"
I tried using soapy water to find a leak but couldn't find one.
Any advice on what to look at next?
EDIT: The air compressor seems to be working fine, it gets up to proper PSI when filling. The suspension lifts at normal speed.
This one is permanent:
U0132-87 (28) Lost communication with ride level control module - Bus signal/message failure - missing a message
This one comes and goes:C1A20-64 (2E) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure
I did the overnight drop test and got these results:
Front left -1"Front right -3/4"Back left -1"Back right -1/2"
I tried using soapy water to find a leak but couldn't find one.
Any advice on what to look at next?
EDIT: The air compressor seems to be working fine, it gets up to proper PSI when filling. The suspension lifts at normal speed.
Last edited by Cabezone; Sep 23, 2022 at 01:55 PM.
Winching
Joined: Feb 2016
Posts: 521
Likes: 119
From: Beaumont, CA
OEM Hitachi?
If so, get a compressor rebuild kit that includes new desiccant, o-rings, spring, and the metal dryer end cap.
Do all that - THEN - wait a few weeks before servicing your front Valve Block.
I have had success just removing, opening, cleaning it out, and putting some silicone spray on the o-rings before re-assembly. (0$)
Some replace the o-rings with a kit ($), others just get a new block ($$$).
Rear valve block may or may not need servicing, but is harder to get to, so save for last.
After my second front block service (I didn't wait after the new desiccant) I have not sagged in - wow - almost 30k miles (over 2 yr)
(I have almost 175k miles)
If so, get a compressor rebuild kit that includes new desiccant, o-rings, spring, and the metal dryer end cap.
Do all that - THEN - wait a few weeks before servicing your front Valve Block.
I have had success just removing, opening, cleaning it out, and putting some silicone spray on the o-rings before re-assembly. (0$)
Some replace the o-rings with a kit ($), others just get a new block ($$$).
Rear valve block may or may not need servicing, but is harder to get to, so save for last.
After my second front block service (I didn't wait after the new desiccant) I have not sagged in - wow - almost 30k miles (over 2 yr)
(I have almost 175k miles)
Last edited by douglastic; Oct 26, 2022 at 03:59 PM.
Rock Crawling
Joined: Jun 2017
Posts: 256
Likes: 37
From: Colorado Springs
I'm not going to tell you what to do, but what I did.
The valve blocks are IMO relatively cheap and easy to replace. You mention that rear block, but isn't horribly hard. I chose to replace valves and compressor at the same time years ago on my 2006 at the same time. I think I made the correct choice and everything works. Lr3 can sit for weeks without dropping, which admittedly shocks me as I now have 175K on all of them. I keep thinking I will replace all of them, but they work just fine.
I was getting similar errors way back then, even the dealership wanted to replace the airbags. I gambled and did the compressor and all three valves and won.
The valve blocks are IMO relatively cheap and easy to replace. You mention that rear block, but isn't horribly hard. I chose to replace valves and compressor at the same time years ago on my 2006 at the same time. I think I made the correct choice and everything works. Lr3 can sit for weeks without dropping, which admittedly shocks me as I now have 175K on all of them. I keep thinking I will replace all of them, but they work just fine.
I was getting similar errors way back then, even the dealership wanted to replace the airbags. I gambled and did the compressor and all three valves and won.
Last edited by COSPILOT; Sep 24, 2022 at 01:09 AM.
Thread Starter
|
7th Gear
Joined: Jun 2022
Posts: 7
Likes: 1
OEM Hitachi?
If so, get a compressor rebuild kit that includes new desiccant, o-rings, spring, and the metal dryer end cap.
Do all that - THEN - was a few weeks before servicing your front Valve Block.
I have had success just removing, opening, cleaning it out, and putting some silicone spray on the o-rings before re-assembly. (0$)
Some replace the o-rings with a kit ($), others just get a new block ($$$).
Rear valve block may or may not need servicing, but is harder to get to, so save for last.
After my second front block service (I didn't wait after the new desiccant) I have not sagged in - wow - almost 30k miles (over 2 yr)
(I have almost 175k miles)
If so, get a compressor rebuild kit that includes new desiccant, o-rings, spring, and the metal dryer end cap.
Do all that - THEN - was a few weeks before servicing your front Valve Block.
I have had success just removing, opening, cleaning it out, and putting some silicone spray on the o-rings before re-assembly. (0$)
Some replace the o-rings with a kit ($), others just get a new block ($$$).
Rear valve block may or may not need servicing, but is harder to get to, so save for last.
After my second front block service (I didn't wait after the new desiccant) I have not sagged in - wow - almost 30k miles (over 2 yr)
(I have almost 175k miles)
I'm not going to tell you what to do, but what I did.
The valve blocks are IMO relatively cheap and easy to replace. You mention that rear block, but isn't horribly hard. I chose to replace valves and compressor at the same time years ago on my 2006 at the same time. I think I made the correct choice and everything works. Lr3 can sit for weeks without dropping, which admittedly shocks me as I now have 175K on all of them. I keep thinking I will replace all of them, but they work just fine.
I was getting similar errors way back then, even the dealership wanted to replace the airbags. I gambled and did the compressor and all three valves and won.
The valve blocks are IMO relatively cheap and easy to replace. You mention that rear block, but isn't horribly hard. I chose to replace valves and compressor at the same time years ago on my 2006 at the same time. I think I made the correct choice and everything works. Lr3 can sit for weeks without dropping, which admittedly shocks me as I now have 175K on all of them. I keep thinking I will replace all of them, but they work just fine.
I was getting similar errors way back then, even the dealership wanted to replace the airbags. I gambled and did the compressor and all three valves and won.
Thread Starter
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7th Gear
Joined: Jun 2022
Posts: 7
Likes: 1
I serviced the air compressor a couple of weeks back; changed out the desiccant, O-rings, spring, and cap. It cleared out the "C1A20-64 (2E) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure" error.
This weekend I'll service the front valve block and see if that fixed my overnight leakage.
This weekend I'll service the front valve block and see if that fixed my overnight leakage.
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