BENDIX BW2187 Manual Do Utilizador

For Additional Information:
Refer to SD-13-4834
Call 1-800-AIR-BRAKE (1-800-247-2725)
Visit: www.Bendix.com

BLINK CODE DIAGNOSTICS
The MC-30 provides diagnostic and configuration information through blink code
diagnostics.  Blink code diagnostics are activated by providing constant power to the ignition
circuit and toggling the brake light power input to the MC-30.

When blink code mode is activated, the MC-30 will blink the trailer mounted ABS warning lamp
to display active fault codes, fault code histor y, ABS configurations, and odometer
mileage.  Blink code diagnostics can also be used to reset active fault codes.

3 times

Display Active Fault Codes

4 times

Display Fault Code History

5 times

Reset Active Fault Codes

6 times

Display EC-30T Configuration

7 times (If Equipped)

Display of Odometer Mileage (x1000)

•

If wheel speeds are detected during blink code diagnostics mode, the MC-30 will exit
blink code diagnostics and return to normal operating mode.

•

Blink code diagnostics can only be activated following a power-up, where wheel speeds
have not been detected.

•

Blink code diagnostics must be activated within 15 seconds of ignition power being ap-
plied.

•

If brake light power is continuously applied for greater than 5 seconds, blink code diag-
nostics will be disabled until ignition power is cycled.

Lamp Behavior During Blink Code Display
Following activation, there will be a 5 second delay followed by the blink code display.
Following a single display of all available messages, the ABS warning lamp will remain on for 5
seconds and then return to normal operating mode.

CALIBRATION OF NON-STANDARD WHEEL SIZES
The MC-30 allows for tire rolling radius and tone ring tooth count parameters to be set for each
axle using a diagnostic tool. These adjustments may be necessary for the MC-30 to accurately
calculate the vehicle velocity and odometer mileage. Wheels of the same axle must be set to the
same rolling radius and tone ring tooth count. In most cases, these parameters are set by the
trailer OEM and do not need to be adjusted. In the case of  a service replacement unit, these
parameters will need to be adjusted if the default settings do not match the vehicle.

500 revs/mile

300 to 700 revs/mile

100 teeth

80, 86, 100, 120 teeth

WHEEL SPEED SENSOR ADJUSTMENT
Speed sensors are properly adjusted by gently pushing (not striking) the sensor into the clip
until it makes contact with the face of the tone ring.  The wheel speed sensor will automatically
adjust as the wheel rotates.  If  rotating the wheel causes a gap of  0.020 in. or greater, check for
excessive wheel bearing play or tone ring run-out.  Proper wheel speed sensor installation is
critical to proper ABS operation.

PLC4Trucks
An MC-30 with PLC will continuously broadcast
PLC messages that indicate trailer ABS status.
At power-up or during a trailer fault condition, the
MC-30 will signal the tractor ABS unit to illumi-
nate the dash mounted trailer ABS lamp.  An os-
cilloscope can be used to verify the presence and
strength of a PLC signal on the power line.  Sug-
gested oscilloscope settings are AC coupling, 1
volt/div, 100 sec/div.  Diagnostic tools are avail-
able that detect the presence of a PLC signal.

BW2187 © 2003 Bendix Commercial Vehicle Systems LLC 6/2003 Printed in U.S.A. All rights reserved.

DIAGNOSTIC LED REFERENCE
If the LEDs shown below are illuminated...

Sensor Fault
The example shown is a Right Front Sensor fault.

Static Wheel Speed Sensor Fault
Verify 1500-2500 OHMs across sensor
connector pins
Dynamic Wheel Speed Sensor Fault
Rotate wheel and verify a minimum of  0.8VAC
sensor output @1RPS across wheel speed sen-
sor pins.  A properly positioned sensor can
output more than 2.0VAC @1RPS.

K J H G F

          E D C B A

1
2
3

30-Pin Connector

C2 Right Front WS+
A1 Right Front WS-
A2 Left Front WS+
A3 Left Front WS-
B1 Right Rear WS+
B2 Right Rear WS-

B3 Left Rear WS+
C1 Left Rear WS-

E1 Ignition Power
E3 Brake Light Power
D2 Ground

Modulator Fault
The example shown is a MOD1 fault.

30-Pin Connector

Static ABS Modulator Fault
* Verify 7.0 to 10.0 OHMs across Hold and
Common Pins
* Verify 7.0 to 10.0 OHMs across Exhaust and
Common Pins
* Verify 14.0 to 20.0 OHMs across Exhaust and
Hold pins

J2 Mod1 Hold
H3 Mod1 Common
J3 Mod1 Exhaust
H2 Mod2 Hold
J1 Mod2 Common
K1 Mod2 Exhaust

E1 Ignition Power
E3 Brake Light Power
D2 Ground

DIAGNOSTIC TOOLS
The MC-30 uses the Bendix ABS Diagnostic Software (PN 5009089) for advanced trouble-
shooting on PC’s.  The Bendix ABS Diagnostic Software requires an RP1210A* adapter.  These adapt-
ers are available from MPSI (Serial data module - PN 129037* and Parallel data module - PN 126032*).
Additional diagnostic tools are available through SPX.  A Bendix PCMCIA card is available for the Pro-
Link tool.  It can be used with EC-15, EC-16, EC-17, EC-30 tractor ABS units and MC-30 trailer ABS
units.

MC-30 WIRING HARNESS (PIGTAIL)
The EC-30T utilizes a pigtail wiring harness to interface with ABS and
other trailer system components. The following connectors are optional
and may not be present on all pigtail harnesses: Modulator 2, auxiliary,
diagnostic, and rear axle wheel speed sensors.

MOST COMMONLY ENCOUNTERED PROBLEMS THAT RESULT IN LEDS
BEING ILLUMINATED
  1. Abraded or cut wires in the convoluted tubing near frame clamps.
  2.  Damaged wires near frame members and frame mounted modulators.
  3. Wire jacket worn through from overlapping sensor and modulator wires near frame

members and frame mounted modulators.

  4. Corroded connectors or seal damage.
  5. Damaged connector latches or connectors not completely seated.
  6. Terminals not completely latched or seated into connectors.
  7. Excessive sensor air gap, sensor clip tension, or excessive bearing end play (gently

push sensor against wheel hub, or readjust bearings).

  8. Damage to exposed wires exiting or entering the convoluted tubing.
  9. Worn, chipped or damaged sensor or modulator.
10. Non-functioning antilock controller.

K J H G F

          E D C B A

1
2
3

ECU Fault
The example shown is an ECU fault. The red ECU
LED indicates a fault internal to the EC-30T. Reset
the MC-30 with a magnet. If the fault returns,
replace the EC-30T. If  the red ECU LED is on and
the green VLT LED is off, the MC-30 may have very
low voltage.

Voltage Out of   Range Fault
A flashing green VLT LED indicates ECU voltage below 8.0 VDC or above 16.0 VDC. The VLT
LED will blink until power is brought into normal range.

POWER AND GROUND
Trailer electrical power is supplied to the MC-30 from the ignition and
brake light circuits.

ADDITIONAL SERVICING TIPS
  1. Do not pierce wires with probes when troubleshooting harnesses.
  2. Gently probe terminals when checking for resistances, do not deform con-

tacts.

  3. Apply nonconductive dielectric grease to any and all connectors if  inspect-

ing or disconnecting connectors.

  4. Bundle and tie wrap excess cable neatly to adjacent air lines or framing

members.

Pin 7

B

Pin E1

(Blue Wire)

Pin 4

A

Pin E3

(Red Wire)

Pin 1

E

Pin D2

(White Wire)

N/A

D

Pin D3

(White/Green Wire)

8.0 to 16.0 VDC

383 mA

2.4 A @ 12 VDC

4.5 A @ 12 VDC

*NEXIQ part nos. Order from your NEXIQ supplier.