Bendix Commercial Vehicle Systems EC-14 ANTILOCK CONTROLLER 5/04 - Manual (Page 7)

7
•
An M-12 ™ modulator malfunction on the rear axle(s).
•
Only front axle antilock will be disabled if a problem with
the M-21
™ or M-22 ™ modulator is detected.
A problem in a single speed sensor will not result in disabling
of the antilock system. If a speed sensor malfunction is
detected by the EC-14
™ controller, the remaining speed
sensor on the axle will be used to continue antilock operation
on the axle but at a slightly degraded level of performance.
With the failed component approach described, the antilock
system will attempt to provide the vehicle with the best
possible braking and stability even after a problem has
occurred. It should be remembered that the driver will be
advised of any degraded antilock operation via the dash lamp
and that standard air braking will still be available on those
brakes where the antilock has been disabled.
ANTILOCK WIRING
GENERAL NOTES
The wires that carry information and power into and out of
the EC-14
™ controller are grouped and terminate at a
connector which plugs into the EC-14 ™ controller. The wiring
harnesses and connectors are weather proof and the wires
that enter the connector are sealed to the connector. The
wire gauge used in the wire harnesses is specific to the
task performed.
When diagnosing wiring in the antilock system the following
general rules apply and should be followed where applicable:
1. It is generally advisable to replace a wire harness rather
than repair individual wires in the harness. If a splice
repair must be made, it is important that the splice be
properly soldered with a rosin flux (not acid based) and
the splice made water proof.
2. Do not pierce wire insulation when checking for continuity.
Check for power, ground or continuity by disconnecting
the connector and testing the individual pins or sockets
in the connector(s).
3. Always check the vehicle handbook for wire and
connector identification. Individual wire identification will
differ depending upon the type of connectors in use, the
vehicle manufacturer, and the system features in use.
4. While the retarder disable and serial link connections (3
total) are present on all EC-14 ™ controllers they are not
always used.
PREVENTATIVE MAINTENANCE
GENERAL
Important: Review the warranty policy before performing
any intrusive maintenance procedures. An extended warranty
may be voided if intrusive maintenance is performed during
this period.
Because no two vehicles operate under identical conditions,
maintenance and maintenance intervals will vary. Experience
is a valuable guide in determining the best maintenance
interval for any one particular operation.
Visually check for physical damage such as broken air lines
and broken or missing parts.
Perform the tests and inspections presented at the
prescribed intervals. If the EC-14
™ controller fails to function
as described, it should be repaired or replaced with a genuine
Bendix unit, available at any authorized parts outlet.
Every 3 months or 25,000 miles, or 900 operating hours:
1. Check all wiring and connectors to ensure they are
secure and free from visible damage.
2. Although the EC-14 ™ controller incorporates a self check
diagnostics, the LED display should be inspected to
ensure that they are functional. With the tractor ignition
on and a brake application held applied, hold a magnet
(800 gauss; capable of picking up 3 ounces) on the
Diagnostic Window Reset Switch and note all of the
LEDs illuminate. If one or more of the LEDs do not
illuminate and the antilock condition lamp on the trailer
indicates the system is functioning properly, the non-
illuminated LED(s) should be noted for future reference.
Although the diagnostic capabilities will be limited, the
system will continue to function as designed.
3. Road test the trailer by making an antilock stop from a
vehicle speed of 20 miles per hour. When an antilock
stop is made, the modulator solenoids pulsate and an
audible burst of air can be heard. The wheels should
not enter a prolonged "lock" condition.
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO
AVOID
PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following
general precautions should be observed at all times.
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3. Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.