10
BRACKET MOUNTED EC-15
™
CONTROLLER
1. Disconnect the electrical connector(s) from the EC-15
™
controller.
2. Note and mark the mounting position of the EC-15
™
controller on the vehicle. Loosen, remove and save the
nuts on the mounting hardware that attaches the EC-15
™
controller bracket to the vehicle. Remove the EC-15
™
controller and bracket from the vehicle.
3. Remove and retain the four cap screws that secure the
EC-15
™
controller to the bracket. Separate the EC-15
™
controller from the bracket.
INSTALLING THE EC-15
™
CONTROLLER
ASSEMBLY
EC-15
™
CONTROLLER MOUNTED ON ANTILOCK RELAY
VALVE
1. After noting the relationship of the positioning marks
made prior to disassembly, position the gasket on the
EC-15
™
controller then secure the EC-15
™
controller to
the antilock relay valve using the four cap screws. Torque
the cap screws to 50-80 lbs. in.
2. Mount the assembled EC-15
™
controller and antilock
relay valve on the vehicle and orient it in the position
marked prior to removal.
3. Reconnect all air lines to the assembly.
4. Reconnect the electrical connector(s) to the EC-15
™
controller.
5. Test the antilock relay valve for operation and leakage
prior to placing the vehicle in service.
6. Perform the “Initial Start-up Procedure” in the
TROUBLESHOOTING section to assure proper antilock
system operation.
BRACKET MOUNTED EC-15
™
CONTROLLER
1. Secure the EC-15
™
controller to its bracket using the
four cap screws. Torque the cap screws to 50-80 lbs. in.
2. After noting the positioning marks, mount the EC-15
™
controller on the vehicle using the mounting hardware
retained during removal.
3. Connect the electrical connector(s) to the EC-15
™
controller.
4. Perform the “Initial Start-up Procedure” in the
TROUBLESHOOTING section to assure proper antilock
system operation.
DIAGNOSING AND LOCATING A SYSTEM
PROBLEM
GENERAL
The EC-15
™
controller contains self test and diagnostic
circuitry that continuously checks for proper operation of
the entire antilock system including wiring continuity. A dash
lamp, controlled by the EC-15
™
controller, advises the driver
of the condition of the entire antilock system. The condition
of specific antilock components is provided to the mechanic
by a series of labeled, light emitting diodes (LED’s) displayed
through a “window” in the EC-15
™
controller housing. No
special tools or equipment are needed to read or interpret
the EC-15
™
controller diagnostics window. It should be noted
that the EC-15
™
controller diagnostics display is separate
from the antilock condition lamp on the dash. With this
separation, the driver is aware of any problems that occur
but is not confused by the diagnostic information. A special
feature of the EC-15
™
controller is the failure latching and
diagnostic system. Intermittent problems, particularly in the
wheel speed sensing area can be difficult to diagnose. When
the controller senses an erroneous condition, whether in
the controller electronics, the modulator or wheel speed
sensing areas, it stores the condition in non-volatile memory,
disables the antilock function, illuminates the dash mounted
antilock condition lamp and the appropriate diagnostic LEDs
on the EC-15
™
controller.
The failure condition is truly stored and is not cleared by
loss of power to the EC-15
™
controller. The LEDs will re-light
when power is restored and remain illuminated until the failure
is corrected. After the actual problem is corrected,
maintenance personnel can clear or reset the EC-15
™
controller diagnostics by passing a small magnet over the
RESET point in the diagnostics window.
DIAGNOSTIC LEDs
There are nine LEDs plus a magnetically actuated reset
switch in the EC-15
™
controller diagnostic window. The first
five LEDs locate a problem to a specific area of the vehicle
while the last four indicate the problem component or its
wiring. The LEDs are software driven and are either ON or
OFF depending upon their monitor function. (Note: Right
and left, front and rear are determined from the driver’s seat.
Left front is therefore the corner closest to the driver.)
