Bendix Commercial Vehicle Systems TABS-6 ADVANCED MC SD SHEET - Manual (Page 39)

39
SECTION F: TROUBLESHOOTING THE
LOAD SENSOR (OUT‑OF‑RANGE CONDITION)
(Note: The indicator lamp for this condition is illuminated only after the vehicle moves.)
Turn off the power to the module.
For spring suspension system trailers:
Verify/inspect the following:
1. Inspect the load sensor linkage:
• Check that the linkage is attached to the axle
clamp.
• Inspect for damage to the linkage components,
loose connectors and mis‑installation.
• Check that the load sensor lever rod is in a
horizontal position with the trailer empty.
• Verify that the sensor linkage has not flipped
over so that it faces the opposite direction.
2. Switch on power to the module. Using Bendix ®
ACom ® Diagnostics, open the TRSP Sensors
screen and press “Start.” Find the load (in lbs.)
that the sensor is registering, and verify that the
actual trailer load is consistent with the value
found. Where the value does not appear to
be correct, perform the load sensor resistance
check:
• Unplug the 12-pin connector from the module.
• With the load sensor lever in the horizontal
position, verify that approximately 2.5K Ohms is
measured between pins four (4) and five (5) and
between pins five (5) and six (6). Using Bendix
ACom Diagnostics open the configuration
screen, then the Load and Sensor Configuration
tab, and select the “Load Sensing” panel.
Verify that the current “Sensing Type” is shown
as “External.” If not, change the selection to
“External.”
Where the value does not appear to be correct,
enter the correct value(s) on the configuration
screen. If your version of Bendix ACom
Diagnostics does not permit you to make these
changes, update your copy of the program
(available as a free download from the support
pages at www.bendix.com.)
Note: Use a scale to obtain the actual empty
trailer weight and use a pressure gauge to obtain
actual empty trailer suspension air bag pressure.
Where possible, obtain the load\pressure curve
from the suspension manufacturer for the specific
suspension\air bag combination to find the expected
values for this vehicle.
Then rerun the power up sequence. Go to Section A.
For air suspension system trailers:
Verify/inspect the following:
1. Check that port P42 is connected by an
unkinked air hose to the primary suspension air
bags.
2. Check that the suspension height control valve
is functioning correctly.
3. Check for air leakage in the suspension system.
4. Switch on power to the module. Using Bendix
®
ACom ® Diagnostics, open the TRSP Sensors
screen and select “Start.” Find the load (in lbs.)
that the sensor is registering, and verify that the
actual trailer load is consistent with the value
found.
5. Where the value does not appear to be correct,
using Bendix ACom Diagnostics, open the
“Pressures” screen and select “Start.” Read
the pressure shown for the airbag port (P42).
If the load value, or pressure value are not as
expected, open the “Configuration” screen; then
the Load and Sensor Configuration tab, and
select the “Load Sensing” panel. Verify that the
current “Sensing Type” is shown as “Internal.” If
not, change the selection to “Internal.”
Note the values shown on the screen for the
current load and pressure. Verify that the values
shown on the screen for the empty and laden
weight and voltage are correct.
Where the value does not appear to be correct,
enter the correct value(s) on the configuration
screen. If your version of Bendix ACom
Diagnostics does not permit you to make these
changes, update your copy of the program
(available as a free download from the support
pages at www.bendix.com.)
Note: Use a scale to obtain the actual empty
trailer weight and use a pressure gauge to obtain
actual empty trailer suspension air bag pressure.
Where possible, obtain the load\pressure curve
from the suspension manufacturer for the specific
suspension\air bag combination to find the expected
values for this vehicle.
Then rerun the power up sequence. Go to Section A.