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TROUBLESHOOT A PROBLEM
PROBLEM
Erratic / Inaccurate
Weight Readings
12
CAUSE
The vehicle is not parked on a
level surface
The vehicle's brakes are on
There is a significant air leak in
the suspension system
The Height Control Valve (HCV)
is malfunctioning or broken
SOLUTION
Park on level concrete ground. Parking on sloped or banked surfaces will
cause the vehicle weight distribution to shift between the axle groups.
Additionally, if one or more of the vehicle's wheels are in a pothole, that
could result in additional pressure or torque on the suspension air bags. This
will cause the suspension to have a different air pressure than what is
normally needed to hold up the given weight.
Release the parking brakes when weighing and/or calibrating. When the
vehicle brakes are set, they could apply additional pressure or torque on the
suspension air bags. This will cause the suspension to have a different air
pressure than what is normally needed to hold up the given weight.
Check air lines for leaks. Having a leak could cause the HCV to refill the
suspension at regular intervals to maintain the vehicle's ride height. If there is
a significant leak, the gauge display will slowly decrease in value and then
quickly increase in value when the HCV refills the suspension system.
If the HCV is not functioning correctly, the air pressure applied to the
suspension system could be inconsistent and/or erratic. To test for an HCV
problem, acquire a weight reading from the Right Weigh gauge and write it
down (refer to gauge operating instructions for proper procedure). Drive the
vehicle around the block and return to the same location. Acquire a second
reading from the Right Weigh gauge. If the two readings are significantly
different, then the HCV might be malfunctioning.
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