Bendix Commercial Vehicle Systems MC-30 TRAILER ABS CONTROLLER - Manual (Page 28)

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SECTION E - DIAGNOSTIC LED QUICK REFERENCE
Comparing your MC-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 right
modulator fault. Troubleshooting and repair are the
same for a fault on either ABS modulator.
The indicated modulator fault may 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 H.
Power
System OK - A solid green VLT LED indicates proper
voltage is reaching the MC-30
™ controller. If no red
LEDs are on, then no faults are detected.
If the ABS indicator lamp is on with no red LEDs, Go
to Section C.
Voltage Out of Range - A fl ashing green VLT LED
indicates ECU voltage below 8.0 VDC or above 16.0
VDC. The VLT LED will fl ash until power is brought
into normal range. Go to Section F.
No Voltage - When the VLT LED is off, the MC-30 ™
controller is receiving very low or no voltage. The ECU
LED may be on in this case. Go to Section F.
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 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 G.
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-30T
™ 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-30T
™ controller. Reset the MC-30 ™
controller with a magnet. If the fault returns, replace
the EC-30T
™ controller.
If the red ECU LED is on and the green VLT LED is off,
the MC-30
™ controller may have very low voltage.
In this case, Go to Section F.
Faulty Power Supply - the MC-30 ™ controller may
not function properly when powered with a battery
charger or other similar device. Power the MC-30
™
controller using a battery or clean power supply. Go
to Section A.