Bendix Commercial Vehicle Systems EC-30 ABS/ATC CONTROLLER 2/08 - Manual (Page 25)

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SECTION F - DIAGNOSTIC LED QUICK REFERENCE
Comparing your EC-30 ™ controller to the following images, identify the fault indicated by the diagnostic
LEDs and follow the instructions in the related troubleshooting section.
ABS Modulator Fault
The red MOD LED is on to indicate a
fault condition with an ABS modulator.
The example shown is a front right
modulator fault. Troubleshooting and
repair are the same for a fault on any
ABS modulator.
The indicated modulator fault may be a
static or dynamic fault.
Static faults are related to wiring or
component failures, such as open or
short circuits.
Dynamic modulator faults are related
to abnormal wheel speed behaviors
during ABS.
Go to Section I.
ATC Fault
Engine Communication
Fault
The red TRC LED is on to
indicate a communication
fault between the EC-30
™
controller and the engine
controller.
Go to Section K.
ATC Modulator Fault
The red TRC and MOD
LEDs are on to indicate a
static fault condition with
the ATC modulator. Static
faults are related to wiring or
component failures such as
open or short circuits.
Go to Section J.
Power
System OK - A solid green VLT LED
indicates proper voltage is reaching the
EC-30
™ controller. If no red LEDs are
on, then no faults are detected.
If either the ABS warning lamp or ATC
active/warning lamp is on with no red
LEDs, go to Section C or D.
Voltage Out of Range - A fl ashing green
VLT LED indicates ECU voltage below
9.0 VDC or above 16.0 VDC. The VLT
LED will fl ash until power is brought into
normal range. Go to Section G.
No Voltage - When the VLT LED is off,
the EC-30
™ controller is receiving very
low or no voltage. The ECU LED may be
on in this case. Go to Section G.
Wheel Speed Sensor Fault
The red SEN LED is on to indicate
a fault condition with a wheel speed
sensor. The example shown is a front
right sensor fault. Troubleshooting and
repair are the same for a fault on any
wheel speed sensor.
The indicated sensor fault may be a
static or dynamic fault.
Static faults are related to wiring or
component failures, such as open or
short circuits.
Dynamic faults are related to abnormal
wheel speed signals or behaviors.
Go to Section H.
Magnetic Fault Reset - All LEDs will be on while a magnet
is held in place at the RESET location. If one or more LEDs
do not come on, replace the EC-30
™ controller. Do not reset
fault codes until troubleshooting of the indicated component
is complete.
ECU Fault - The red ECU LED is on to indicate a fault condition
internal to the EC-30
™ controller. Reset the EC-30 ™ controller
with a magnet. If the fault returns, replace the EC-30 ™ controller.
If the red ECU LED is on and the green VLT LED is off, the
EC-30
™ controller may have very low voltage.