TROUBLESHOOTING THE BENDIX MC-30 TRAILER ANTILOCK SYSTEM
TYPICAL
TRAILER AXLE
Mounting
Block
Tie Wrap
Wheel Speed
Sensor
P.N. 560560-2
ABS
If light remains on,
ABS unit should be serviced.
1-800-AIR-BRAKE
30-PIN
CONNECTOR
DIAGNOSTIC DISPLAY
3-PIN MOD1
CONNECTOR
ABS
Configuration
Control Group A Control Group B
2S/1M Axle Dolly-Axle
2S/2M Axle Side
4S/2M Axle Side
Toggle
Toggle
Toggle
CAUTION: An incorrect ABS configuration may
cause a fault indication or degraded
ABS performance. All MC-30 service
replacement parts are initially defaulted to
4S/2M side control and may need to be
reconfigured upon installation. Before and
after activating a self-configuration, always
determine the current ABS configuration by
monitoring the diagnostic LEDs at power-up
or by activating blink code diagnostics.
POWER-UP SEQUENCE
WARNING LAMP SEQUENCE: When power is applied, the trailer
ABS Warning Lamp will turn on for a 2.5 second bulb check, and
then turn off. If a PLC tractor and PLC trailer are powered at the
same time, the MC-30 will also trigger a 2.5 second bulb check
on the tractor dash using PLC.
CHUFF TEST: The MC-30 will perform a modulator “chuff test”
at power-up. With brake pressure applied, a properly installed
modulator will cause five rapid, audible chuffs of air pressure. If
two modulators are installed, the MC-30 activates five chuffs at
MOD1 and then MOD2. The chuff sequence is then repeated.
LED SEQUENCE: At power up, the diagnostic LEDs all turn on,
then display the current configuration.
MC-30 — LED Power-Up Sequence
At power-up All LEDs
1st blink displays number of wheel speed sensors
2 Sensors SEN-FRT
4 Sensors SEN-RER-FRT
2nd blink displays modulator configuration
1 Modulator (Dolly-Axle control) MOD
1 Modulator (Axle control) MOD-FRT
2 Modulators (Axle control) MOD-RER-FRT
2 Modulators (Side control) MOD-LFT-RHT
Normal Operation
No Faults VLT (green) LED illuminated only
FAULT DETECTION: When a fault is detected, the trailer ABS warn-
ing lamp will remain on. If the tractor and trailer are equipped
with PLC, the dash mounted trailer ABS lamp will also remain
on. The warning lamps notify the driver that all or part of the ABS
function has been disengaged and standard air braking is in ef-
fect. The faulted component will be identified on the diagnostic
display.
FAULT RESET: The MC-30 will automatically reset (self-heal) the
active fault code when the fault is corrected. Repeated occur-
rences of a given fault will cause the fault code to latch. Once the
fault code is latched, the fault code will need to be cleared by a
magnetic reset or through blink code diagnostics.
MAGNETIC RESET: The ECU can be reset by momentarily hold-
ing a magnet against the RESET area on the controller. All the
LEDs will be on while the magnet is held in place. If faults occur
on multiple components, the LEDs will display one fault at a time.
When the first fault is cleared and the MC-30 is reset, the next
fault will be displayed on the LEDs.
SELF-CONFIGURATION: This is generally performed after replace-
ment of an MC-30. When activated with a magnet or diagnostic
tool, the wheel speed sensor, modulator and ABS control set-
tings can be altered. After holding a magnet on the ECU reset
location for 20 seconds, the LEDs will begin to roll and the MC-
30 will self-configure. IF IT IS NOT DESIRED TO TOGGLE THE
ABS CONTROL, REMOVE THE MAGNET AFTER 20 SECONDS.
ABS CONTROL TOGGLE: The MC-30 ABS control setting can be
toggled between axle control, dolly-axle control or side control.
To activate an ABS control toggle, continue to hold the magnet in
place while the LEDs are rolling, for an additional 20 seconds (a
total of 40 seconds). The LEDs will begin to flash rapidly. Re-
move the magnet. Verify the new ABS configuration by monitor-
ing the LED sequence at power-up or by activation of blink code
diagnostics.
MC-30
ABS Warning
Lamp
C
2
A1
A2
A3
B3
C
1
B1
B2
Le
ft F
ro
n
t
R
igh
t F
ron
t
R
ig
h
t R
e
a
r
L
e
ft R
ea
r
W
S-20
W
S-20
W
S-20
W
S-20
H
3
J2
J3
M
O
D
1
J1
H
2K1
M
O
D
2
Bendix
D
iagnostic
Tools
RESET
E1 +12V Ignition Power
E3 +12V Brake Light Power
D2 Ground
D1 N/A
D3 ABS Warning Lamp (Source)
C2 Right Front Wheel Speed +
A1 Right Front Wheel Speed -
A2 Left Front Wheel Speed +
A3 Left Front Wheel Speed -
B1 Right Rear Wheel Speed +
B2 Right Rear Wheel Speed -
B3 Left Rear Wheel Speed +
C1 Left Rear Wheel Speed -
J2 Modulator 1 Hold
H3 Modulator 1 Common
J3 Modulator 1 Exhaust
H2 Modulator 2 Hold
J1 Modulator 2 Common
K1 Modulator 2 Exhaust
G1 Diagnostic, J1587, Serial A
G2 Diagnostic, J1587, Serial B
E2 Diagnostic, +12v Ignition
C3 Diagnostic, GND
K3 Auxiliary Switch Input #1
F2 Auxiliary Switch Input #2
G3 Auxiliary Switch Input #3
H1 Auxiliary Switch Input #4
F3 Auxiliary Switch Input #5
F1 Auxiliary Low Side Output
K2 Auxiliary High Side Output
7-Pin Trailer
Electrical Connector
ABS Warning Light
M
C
-30
M
-30T
Pigtail 30-Pin
C
onnector
G
1, G
2
E
3
D
2
E
1
F2
D
3
E2
C
3
Aux Sw
itch
Input #1
Aux S
w
itch
Input #2
Aux Sw
itch
Input #3
Aux Sw
itch
Input #4
Aux Sw
itch
Input #5
Aux Low
Side
O
utput Load
Aux H
igh Side
O
utput Load
G
round
G
round
A Brake Light Power
B Ignition Power
C N/A
D Trailer ABS Warning Lamp
E Ground
C
E
B
A
D
C
E
B
A
D
Ignition
Power
Brake Light
Power
Ground
Ignition
P
ow
er
5-Pin ABS
Connector
K3
G
3
H
1
F3
K2
F1
K J H
G
F
E
D
C
B A
1
2
3
Tw
isted
C
onductor
Brake Lines
(6 pages)
(1 pages)
(2 pages)
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