User's Manual

32
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ipped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 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.
3. Where the value does not appear to be correct,
perform the load sensor resistance check:
• Unplugthe18-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 nine (9) and between
pinsnine(9)andten(10).UsingBendixACom
Diagnosticsopenthecongurationscreen.Select
theLoadandSensorCongurationtab,andthen
viewthe“LoadSensing”panel.Verifythatthe
current“SensingType”isshownas“External.”If
not,changetheselectionto“External.”
• Notethevaluesshownonthescreenforthecurrent
load and sensor voltage. 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conguration
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.Wherepossible,obtaintheload/deectioncurve
fromthesuspension/springmanufacturerforthespecic
suspension/springcombinationtond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
pressure value is not as expected, open the
“Conguration”screen;thenselecttheLoadand
SensorCongurationtab,andthenview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 pressures are correct.
Where the value does not appear to be correct,
select “modify”, and enter the correct value(s)
ontheconguration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specicsuspension/
airbagcombinationtondtheexpectedvaluesfor
this vehicle.
Thenrerunthepowerupsequence.GotoSectionA.