Bendix Commercial Vehicle Systems EC-13 TRAILER ANTILOCK CONTROL 8/07 - Manual (Page 8)

8
NOTE: The MID LED shown in the chart on the previous
page is not used in the diagnostic process for
the EC-13
™ controller however, it will light when
a magnet is placed on the RESET switch in the
diagnostic window.
“FRONT” LED
This red LED illuminates and latches ON in order to indicate
the location of a problem component or its wiring. It will
light in conjunction with either the RIGHT or LEFT LED and
the SENS LED when indicating a speed sensor problem.
The FRONT LED will also light in conjunction with the MOD
LED to indicate that the front modulator (M-12
™ or M-12R ™ )
or its wiring has malfunctioned.
“MID” LED
This red LED is not used in troubleshooting the EC-13 ™
controller and should light only when a magnet is held on
the RESET switch.
“REAR” LED
This red LED illuminates and latches ON in order to indicate
the location of a problem component or its wiring. It will
light in conjunction with either the RIGHT or LEFT LED and
the SENS LED when indicating a speed sensor problem.
The REAR LED will also light in conjunction with the MOD
LED to indicate that the rear modulator (M-12
™ ) or its wiring
has malfunctioned.
“RIGHT” LED
This red LED illuminates and latches ON in order to indicate
the location of a problem component or its wiring. It will
light in conjunction with either the FRONT or REAR LED
and SENS LED. This LED SHOULD NOT LIGHT when a
MOD LED is on.
“LEFT” LED
This red LED illuminates and latches ON in order to indicate
the location of a problem component or its wiring. It will
light in conjunction with either the FRONT or REAR LED
and SENS LED. This LED SHOULD NOT LIGHT when a
MOD LED is on.
“MOD” LED
This red LED illuminates and latches ON to indicate a
permanent or intermittent open or short circuit in the
solenoids of one of the two modulators or the wiring
connecting them to the system. The MOD LED will
illuminate in conjunction with either the FRONT or REAR
LED.
“SENS” LED
This red LED illuminates and latches ON to indicate
permanent or intermittent problem. The failures indicated
are; open or shorted wheel speed sensor, open or shorted
wheel speed sensor wiring, wheel speed signal not present
or does not conform to design criteria. The SENS LED will
illuminate in conjunction with either the FRONT or REAR
and either the RIGHT or LEFT LED.
“ECU” LED
This red LED, when illuminated, indicates that the controller
itself has failed. It is latched ON for all EC-13
™ controller
failures except low voltage. For voltages less than 6 vdc,
the LED illuminates to indicate the controller is inoperative,
however when the voltage again exceeds 6 vdc the LED
will go OUT by itself.
“VOLT” LED
This green LED illuminates and remains ON during trailer
operation to indicate that vehicle power is reaching the
controller (LED ON only when a brake application is made).
If vehicle power is out of range for proper operation (below
7 vdc or above 18 vdc) this LED will fl ash until power is
brought into range. This LED may also fl ash indicating
that a “marginal” low voltage condition existed at the time
of an antilock event.
“RESET”
Beneath the RESET area of the window display is a
magnetically sensitive switch that is used to reset the
diagnostic system. The device will respond to a magnet
which has strength suffi cient to lift a three (3) ounce weight.
Holding a magnet against the RESET will cause all LEDs
to light during the time the magnet is against it.
TROUBLESHOOTING
GENERAL
While the EC-13 ™ controller diagnostic display locates
a specifi c problem area, it is still necessary to confi rm
whether the problem resides in the component itself or
the wiring. Basically the troubleshooting procedure that
follows is devoted to narrowing the problem to either the
wiring or a specifi c antilock component. It should be noted
that ALL TROUBLESHOOTING BEGINS BY OBSERVING
THE ANTILOCK STATUS LAMP ON THE TRAILER WHILE
PERFORMING THE “INITIAL START-UP PROCEDURE”
and following the directions contained in the procedure.