User's Manual

16
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Ext. 2
Troubleshooting Guide
Troubleshooting Guide
Problem Possible Problem Check Procedure Solution
Pneumatic Control System
Problem
Possible Problem Check Procedure Solution
Air System leaks.
• leaky airbag
• leaky pneumatic fittings
(i.e.: drain valve, Height
Control Valve [HCV])
• cut or pinched air line
• Spray air bag with a soapy
water solution.
• Spray fittings with a soapy
water solution.
• Conduct visual inspection.
• If leaking, replace air bag.
• Tighten fittings.
• Repair or replace as
necessary.
Suspension rides rough. • Air bag is mounted too
high or too low.
• OE shocks are too stiff or
worn out.
• Measure the mounted height.
• Bounce the rear of the truck.
If there are more than two
oscillations, the shocks are
too worn. If less than two
oscillations, shocks are too stiff.
• Adjust mounted height as
necessary.
• Install Air Lift Select-A-Ride
shocks.
Compressor doesn't run. • blown fuse
• loose wire or ground
• bad pressure switch
• Check fuse.
• Inspect wiring connections.
• Jumper pressure switch.
• Replace fuse.
• Tighten loose wires or grounds.
• If compressor runs, replace
switch.
• If compressor does not run,
replace compressor.
Compressor runs all the
time.
• HCV or height sensor is
mounted incorrectly.
• Bad pressure switch
• Check manual for mounting
location and adjustment
instructions.
• Disconnect switch.
• Move HCV or height sensor
further towards the pivot
bushing.
• If compressor stops, replace
switch.
SmartAir Control System
Problem
Possible Problem Check Procedure Solution
Compressor doesn't run. • blown fuse
• loose wire or ground
• Relay/ECU
• Magnet to ECU distance
• Magnet direction/180˚ off
• Check fuse.
• Inspect wiring connections.
• Ground terminals #85 if
compressor runs.
• Magnet may be too close or
too far from ECU
• Magnet not facing ECU
properly.
• Replace fuse.
• Tighten loose wires or grounds.
• If compressor runs, replace ECU
• If compressor does not run,
replace compressor.
• Refer to SmartAir manual for
proper distance between magnet
and ECU
• Make sure dot on magnet
points towards the ECU
Compressor runs all the
time.
• Possible major leak. • Check system for leaks.
• Repair as necessary.
Truck sits too low or too
high.
• Air spring mounting height
is not correct.
• Measure the distance
between the upper and
lower air bag mounting
surfaces.
• Change the ride height as
necessary to within
specifications given in the
manual for rolling lobe
mounting heights.
Rear end "jacks" when
vehicle is accelerated.
• Shocks are not compatible
with air suspension.
• Truck lurches when
accelerating.
• Install Air Lift Select-A-Ride
shocks.
System will not kneel. • Stuck or clogged solenoid
• Damaged or improperly
connected switch.
• Inspect the exhaust port or
energize the solenoid.
• Ensure that switch wiring is
correct by referencing the
wiring diagram in the Smart-
Air manual.
• Replace solenoid.
• Replace switch if found faulty.
• Stuck or clogged solenoid
• Damaged or improperly
connected switch.
• Inspect the exhaust port or
energize the solenoid.
• Ensure that switch wiring is
correct by referencing the
wiring diagram in the Smart-
Air manual.
• Replace solenoid.
• Replace switch if found faulty.
System will not kneel.
Vehicle is not level side-
to-side within 3/8".
• OEM axle perch is not
level side-to-side.
• Refer to Inspecting Axle
Spring Perch Uniformity in
the manual.
• Add a 1˚ shim per the
Inspecting Axle Spring Perch
Uniformity section.