Section 01 TECHNICAL MANUAL
Subsection 02 (AIR CONTROLLED SUSPENSION (ACS))
TROUBLESHOOTING
DIAGNOSTIC TIPS
Error Code (AIR FAULT) Displayed in
Gauge
The error code
AIR FAULT
can appear on the mul-
tifunction gauge for different reasons that are not
necessarily related to a failure of the ACS system.
If the error code appears on the multifunction
gauge, it indicates a disparity between the re-
quested and the actual suspension settings. The
system should react to correct this situation and
the error code will disappear.
If the error code remains active for a long period,
it may indicates a major leak in the system. In this
case, the module will automatically shut down the
compressor to prevent it from overheating. The
shut down procedure of the compressor will stay
active until the next restart of the vehicle (key OFF,
key ON).
If there is a major leak in the system, check the
system for leakage, refer to
ACS SYSTEM LEAK
TEST (TROUBLESHOOTING WITH B.U.D.S.)
sub-
section.
Error Code Displayed and Suspension Setting
Can Not Be Adjusted
If there is no leak, it is probably an electrical prob-
lem. In this case, an electrical failure of the com-
pressor or the solenoid valve will result the impos-
sibility to change the actual suspension setting.
After multiple attempts to change suspension
setting, the module will activate error code
AIR
FAULT
. Refer to
TROUBLESHOOTING GUIDE-
LINES
for further troubleshooting procedure.
TROUBLESHOOTING
GUIDELINES
Requested Setting Display Does Not
Change in Gauge
1. Check the override/
ACS
button as detailed in
OVERRIDE SWITCH
in the
LIGHTS GAUGE
AND ACCESSORIES
subsection of the appro-
priate Shop Manual.
Suspension Setting Can Not Be
Changed
1. Check the override/
ACS
button as detailed in
OVERRIDE SWITCH
in the
LIGHTS GAUGE
AND ACCESSORIES
subsection of the appro-
priate Shop Manual.
2. Check fuse (F14).
3. Check ACS module signal continuity.
4. Check ACS module input voltage.
5. Check ACS module ground.
Refer to
ACS MODULE
to see the complete test-
ing procedures.
Suspension Setting Can Be Reached to
Decrease Pressure Only
1. Check relay (R5).
2. Check ACS compressor operation.
3. Check ACS compressor input voltage.
Refer to
ACS COMPRESSOR
to see the complete
testing procedures.
Suspension Setting Can Be Reached
To Increase Pressure Only
1. Check ACS solenoid valve operation.
2. Check ACS solenoid valve input voltage.
Refer to
ACS SOLENOID VALVE
to see the com-
plete testing procedures.
No Pressure Output from the Auxiliary
Line
1. Ensure that ACS suspension setting is adjusted
to
ACS 6
to provide the maximum air pressure
in the auxiliary line.
2. Check pressure transducer for air leakage.
3. Check signal continuity of the auxiliary line pres-
sure transducer.
4. Check input voltage of the auxiliary line pres-
sure transducer.
5. Check ground of the auxiliary line pressure
transducer.
6. Check compressor operation.
Multifunction Gauge Display Flickers
OFF and Back ON
1. Check diode (D7) of the solenoid valve.
NOTE:
The diode (D7) is located on the main har-
ness near the ACS sub-harness junction. Refer to
the appropriate
WIRING DIAGRAM
for location.
30
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