rear air suspension problem
03-28-17, 08:27 PM
#1
Driver School Candidate
Thread Starter
rear air suspension problem
Replaced the height control sensors in my 2006 GX470. The height control worked ok for a few weeks. But now it is gone back to its original problem which was not pumping the air springs and the car in its lowest position (on bumper stops).
Any thoughts or suggestions would be highly appreciated.
Any thoughts or suggestions would be highly appreciated.
03-28-17, 09:33 PM
#2
Driver School Candidate
You Replaced the height control sensors: when U did this did its On Board Diagnostic code disappear ? There are near 100 air suspension On Board Diagnostic codes: did your code reader originally indicate any of them ?
The following users liked this post:
ARS (03-31-17)
The following users liked this post:
ARS (03-31-17)
03-31-17, 01:16 PM
#4
Driver School Candidate
Thread Starter
Sorry if this posts twice (new to CL forum).
Thanks for both of your responses. I am working closely with my mechanic friend and have asked if he remembers what the initial error code(s) were.
Apparently the air bags are ok and holding pressure.
The more accurate description of the previous and current problem is the height control indicator in the instrument panel is stuck in "N" position (solid not flashing) and not responsive to raise or lower commands thru the console switch. The rear suspension is bottomed out.
I tried to reset the ECM by shorting pin 4 and 13 of the OBD2 port, but that didn't seem to make any difference.
The current error codes are:
C1714 which is Left Rear Height Control Sensor
C1751 which is Continuous Electric current to Height Control Compressor
and three other ones that I haven't been able to decode: 5733H/2223, 5734H/22324, and 5741H/22337
He tells me he is able to raise and lower the rear thru his diagnostics instrument. This seems to suggest the main components (compressor, regulating valves, air bags and most probably the height sensors are ok.
I am thinking this might be an intermittent connection, but where could it be since the height control sensor connections were checked?
Is it possible that the error codes prevent proper functioning of the AHC? If so, why would the diagnostic instrument can operate the AHC?
Any other possibility, thoughts or suggestions would be appreciated.
Thanks.
Thanks for both of your responses. I am working closely with my mechanic friend and have asked if he remembers what the initial error code(s) were.
Apparently the air bags are ok and holding pressure.
The more accurate description of the previous and current problem is the height control indicator in the instrument panel is stuck in "N" position (solid not flashing) and not responsive to raise or lower commands thru the console switch. The rear suspension is bottomed out.
I tried to reset the ECM by shorting pin 4 and 13 of the OBD2 port, but that didn't seem to make any difference.
The current error codes are:
C1714 which is Left Rear Height Control Sensor
C1751 which is Continuous Electric current to Height Control Compressor
and three other ones that I haven't been able to decode: 5733H/2223, 5734H/22324, and 5741H/22337
He tells me he is able to raise and lower the rear thru his diagnostics instrument. This seems to suggest the main components (compressor, regulating valves, air bags and most probably the height sensors are ok.
I am thinking this might be an intermittent connection, but where could it be since the height control sensor connections were checked?
Is it possible that the error codes prevent proper functioning of the AHC? If so, why would the diagnostic instrument can operate the AHC?
Any other possibility, thoughts or suggestions would be appreciated.
Thanks.
03-31-17, 02:22 PM
#5
Driver School Candidate
ARS, I am not a fan of air suspension systems: my last car(not Lexus) had this system, and one day I noticed the car looked like the rear end was sinking into the ground. I didnt want to deal with it AT ALL, so I converted it to a coil spring system. Fortunately, for you there is such a coil spring conversion kit available for your vehicle: https://www.arnottindustries.com/par...41_gid559.html
If you decide to go this route, make sure Arnott verifies it is compatible with your exact model/year. I would convert: why? You have a mechanic friend: he can pull ALL the diagnostic codes: 2 known & 3 unknown, AND he can raise/lower the rear air suspension with his diagnostic instrument: BUT he does not know what the problem is (I am not casting aspersions on your friend: the cause of many of these multi-error code problems can extremely difficult to nail down to the specific component/(problem causer); You could go to the dealer: their PROBABLE solution: " You need to replace the ENTIRE air suspension system"; if I were in your situation, I would convert to coil springs: they NEVER deflate.
If you decide to go this route, make sure Arnott verifies it is compatible with your exact model/year. I would convert: why? You have a mechanic friend: he can pull ALL the diagnostic codes: 2 known & 3 unknown, AND he can raise/lower the rear air suspension with his diagnostic instrument: BUT he does not know what the problem is (I am not casting aspersions on your friend: the cause of many of these multi-error code problems can extremely difficult to nail down to the specific component/(problem causer); You could go to the dealer: their PROBABLE solution: " You need to replace the ENTIRE air suspension system"; if I were in your situation, I would convert to coil springs: they NEVER deflate.
The following users liked this post:
ARS (04-05-17)
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