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Introduction
•
Solenoid Failure or Solenoid Driver Failure,
Exhaust Solenoid — If this solenoid fails, a
fault will be logged and transmitted via J1939.
It will be possible to inflate the air bags, but not
deflate them.
•
Solenoid Failure or Solenoid Driver Failure,
Individual Channels — If one of the channel
control solenoids fails, it will not be possible to
control the suspension at that corner. To avoid
unbalancing the vehicle, all corners will be held
at the same height as the disabled corner.
•
Data Link Failure — If the system remains
powered for an extended time with no commu-
nication, a fault will be logged that can be
retrieved when communication is reestab-
lished. Suspension height will be held at the
last valid command. This feature is helpful in
troubleshooting intermittent data link failures.
•
Analog Height Command Input Failure — If
this input fails, a fault will be logged and
reported via J1939. The suspension will be
controlled to the last available valid height
setting.
•
Sensor Supply Voltage or Return Failure —
The controller will log and report a fault via
J1939. Height information will not be available
for control purposes. The air bags will be held
at a nominal pressure setting of 4 bars (TBD).
•
Loss of Inlet Pressure — If the system is
powered for a substantial period without read-
ing air pressure at the inlet, a fault will be
logged and reported via J1939. All solenoid
and control activity will be disabled.
•
Inlet Pressure Sensor Failure — If the inlet
pressure sensor fails, the system will check for
acceptable reservoir pressure by using the
manifold pressure sensor. A fault will be logged
and reported via J1939.
•
Main Manifold Pressure Sensor Failure — A
fault will be logged and reported via J1939.
Height control operation will be normal. How-
ever, the capability of the system to detect fault
conditions will be impaired; for example, the
ability to detect an air bag puncture.
•
Sensor Linkage Bent or Out of Calibration
— Unless the sensor is grossly out of calibra-
tion, the system will assume that the (incorrect)
sensor feedback reading results from load vari-
ation. This may result in uneven height
settings.
Page 4
Meritor Maintenance Manual MM-0997 (Revised 12-09)
Section 1
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Table of Contents
Troubleshooting
