HYDROPNEUMATIC SUSPENSION I HAVE A 1986 420 SEL. THE HYDROPNEUMATIC SUSPENSION IS NOT WORKING. HOW DO I SOLVE THIS PROBLEM

a 18 ton
Mercedes-Benz Actros heavy truck.

no year told, 1996 to now
nor what transmission is there.

this
16-speed hydropneumatically operated automatic gearbox.
12-speed Powershift transmission.

some of these original suspension parts do not have service ports on them.. they are a sealed item that requires replacement when worn out..the new replacement parts may have grease fittings made into them.. you may need the replacements..sorry for the bad news..

Hello, I would suggest having the Air Suspension scanned at its Diagnostic plug. You will have to get a scanner capable of reading this unique Diagnostic plug. Now Autozone, Advance, and Oreillys have scanners and you will probably need to call ahead to see if their equipment will do this scan. These above parts stores will scan for free.

As you probably know by now, guessing can be expensive. You may have bought a Relay you did not need. If you have time and determination, you may want to disconnect the Electric connectors at each suspension bag and check for corrosion. WD-40 will help clean the contacts.

It is also possible to disconnect each individual wheel sensor when the buzzing is occurring and you may be able to isolate the problem wheel. Then go from there for Grounding straps and so on.

Your Air suspension depends on all the doorjam and trunklid switches to make a circuit or the Air suspension will not work properly. If the trunklid did not close enough to activate a "trunk ajar" light, you may still have had enough slack for the Air suspension circuit to fail.

You can get into a lot of manual wire testing without a scanner. I would appreciate a note when the problem is solved.

You can't check the fluid in you shock absorbers if they are worn out they just need to be replaced.

my 2005 lincoln navigator air suspension doesnt want to work how do i make it lift up?

could be the shock is no good and its broke inside

1. Press the TUNE/SEL knob to enter the main menu
2. Turn the TUNE/SEL knob until set clock appears on the display
3. Press the TUNE/SEL knob to select set clock
4. Turn the TUNE/SEL knob to adjust the time
5. Press the TUNE/SEL knob to update the time.Time updated will appear on the display

Thank you for using Fixya and good luck.

This is from 'www.nissanforums.com', it should solve your problem. You can usually google your make (Nissan) and codes and get an answer...

My 98 Altima (90k miles) started throwing a P0440 around 3 months and I have recently found a solution that worked on my vehicle.

What didn't work: Clicking the gas cap to make sure it was on securely; replacing the gas cap with an OEM cap purchased from the dealer.

Quirks: After I reset the SEL, it would take about 2-3 days for the SEL to reappear. Also, if I went on trips >60miles, the SEL would go off. Also, in temperatures below 30 degrees F, the SEL would not come on.

My Solution: The EVAP Canister Vent Control Valve (CVCV). This is located on the front of the EVAP canister which is located just behind the rear, drivers side tire. It can be removed w/ 2 screws, one hose, and one electrical connection. Apparently on certain years of the Altima's, water is able to creep back up the hoses and enter the CVCC --- which causes it to rust after several years. Some ppl install a Water Separator to solve this problem before it comes a problem. In my case, it was too late.

After removing the CVCV and attempting to manipulate the valve, it was apparent what the problem was --- the valve was stuck in the open position. Being the idiot that I am, i simply closed the valve and stuck it back in my car. After about 10 miles of driving, the SEL returned.

The next day I removed the CVCV again, but this time I sprayed it WD40 and lightwieght brake fluid. I used a screwdriver to open and close the valve and it kept getting easier and easier to move as I continued to manipulate the valve. It actually got to the point where the valve would close itself w/o me moving it with the screwdriver -- it was a very fluid motion. At this time, I returned it to the vehicle.

It's been about a month now and the SEL has remained off. I have come to the conclusion that this resolved the problem.

Phillyp

Model: 2HX69 -2003 BONNEVILLE SE SEDAN
Gross Vehicle Weight Rating: 2073 kg (4571 lb)
Build Date: 07/26/2002
OPTION CODES
AG1 - 6-WAY POWER DRIVER SEAT
AK5 - DUAL FRONTAL AIR BAGS
AS7 - SEATS, CLOTH BUCKET
AU0 - REMOTE KEYLESS ENTRY
B0M - VEHICLE GM PROD WEEK 30
C67 - AIR CONDITIONER WITH ELECTRONIC CONTROLS
DG7 - DUAL POWER SPORT MIRRORS
DH6 - ILLUM VISOR VANITY MIRRORS
D55 – CONSOLE
FE1 - SUSPENSION SYSTEM, SOFT
FE9 - 50-STATE EMISSIONS
FLT - FLT-FLEET ORDERS
FQ3 - AXLE RATIO 2.86
IHB - TRIM INTERIOR DESIGN
JL9 - ANTILOCK BRAKES - 4 WHEEL DISC
KCV - FLT-ALAMO RENT A CAR
K68 - GENERATOR 105 AMP
L36 - 3.8 LITER 3800 SERIES II V-6
MN3 - TRANSMISSION, AUTOMATIC 4-SPEED
MX0 - 4-SPEED AUTOMATIC TRANSMISSION
NK5 - STEERING WHEEL, STANDARD
NT9 - FEDERAL EMISSION SYSTEM
ORN - PLANT CODE ORION, MI
PF5 - WHEELS, 16" PAINTED ALUMINUM
QNX - P225/60R16 BSW STL TOURING
R6F - IDENTIFY B CODE USERS
R8M - AVIS/NATIONAL RAC TRACKING CODE
T43 - REAR DECKLID SPOILER
UA6 - THEFT DETERRENT SYSTEM
UB3 - RALLY GAGES W/TACHOMETER
UV7 - ANTENNA, REAR WINDOW
UW6 - 6-SPEAKER SOUND SYSTEM
U1Q - RADIO, AM/FM WITH CASSETTE, CD AND PROGRAMMABLE EQUALIZER (REPLACES STD/OPT PKG RADIO)
U2J - DELETE XM SATELLITE RADIO
VM4 - BUMPER STD IMPACT,FRT 5, RR 2.5
VN9 - DAILY RENTAL REPURCHASE PROGRAM
V2G - CREDIT IN LIEU OF FUEL
V73 - VEHICLE CERTIFICATION U.S.
1SB - OPTION GROUP - 1SB
1SZ - HEAT AND SEAT DISCOUNT
54U - LIGHT BRONZEMIST METALLIC
56B - TRIM, TAUPE
56I - TRIM, TAUPE
6DK - COMPONENT FRT LH COMPUT SEL SUS
7DK - COMPONENT FRT RH COMPUT SEL SUS
8CM - COMPONENT RR LH COMPUT SEL SUS
9CM - COMPONENT RR RH COMPUT SEL SUS

check to see if there is a ride height sensor in the rear of the truck and make sure that both side are even.