WABASH COMMUNICATIONS MBS-1P User manual

MBS-1P
Installation Guide
APRIL 2003
Heavy Duty Trailer ABS
by Wabash National
®

Notes, Cautions, and Warnings
This manual contains Notes, Cautions, and Warnings in addition to the
assembly instructions.
Notes: Provide additional comments to help with installation and set up.
Cautions: Provide notification of situations that can cause damage to
machinery and tools.
Warnings: Provide alerts to situations that can cause personal injury
or death.
Please take the time to read and understand this manual before
beginning assembly.
CAREFULLY FOLLOW THE SAFETY AND OPERATING
INSTRUCTIONS IN THIS MANUAL.
Due to a policy of continuous product improvement, we reserve the right
to make changes at any time, without notice, in prices, materials, colors,
specifications, equipment, models, and availability. Some photos and
drawings in this manual contain optional equipment. Since some
information may have been updated since the time of printing, please
check with your Wabash dealer for complete details.
© 2003 Wabash Technology Corp. All rights reserved. No portion of these
materials may be reproduced, stored, or transmitted without prior written
approval of Wabash National.
Wabash is an equal opportunity employer. M/F/V/H

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i
MBS-1P Installation
322UX040
Top of ECM
+
+
+
MBS-1
MBS-1P
MBS-2
No Marking
or
One of the Following:
Numbers "1", "2", "3", "4" or "5"
in this Area.
Wheel Speed Sensor
Cable Location
Wheel Speed Sensor
Wire Goes Into
Backing Plate
Wheel Speed Sensor
Wire Goes Into
Backing Plate
Wheel Speed Sensor
Wire Goes Into
Axle Tube
Wheel Speed Sensor
Wire Location
Wheel Speed Sensor
Wire Location
Top of ECM
The Letter "P"
in this Area.
The Letter "P"
in this Area.
Top of ECM
MBS Identification
Before service or diagnostics is performed on a Wabash MBS unit, the system design must be
verified. Do not rely on labels or verbal descriptions to identify the MBS system. Refer to the
illustration below and compare the marking in the lower right-hand corner of the ECM with the
location(s) of the wheel speed sensor wire or cable on the trailer’s axle(s). Make sure to properly
identify the Wabash MBS; flash codes and system components are different for each system.

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ii
MBS-1P Installation
Contents
Wabash MBS-1P ABS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
MBS-1P System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
General Air Brake Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Key Dates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
ABS Design Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Type of ABS Required for Trailers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Power Requirements for ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
ABS Malfunction Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Color and Labeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Intensity and Photometric Requirements . . . . . . . . . . . . . . . . . . . . . . . . .8
Power Line Carrier (PLC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Pneumatic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Installation of Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Power and Sensor Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
MBS-1P Cable Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Circuit Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Malfunction Lamp Diagnostic Switch . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Pneumatic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
MBS-1P Location and Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Plumbing Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Relay Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Hub Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Initial System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
ABS System Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Initial System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Pneumatic Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Electrical Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Troubleshooting The System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Entering the Flash Code Diagnostic Mode . . . . . . . . . . . . . . . . . . . . . . .27
Suitable Light Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Current Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Stored Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Clearing Stored Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Malfunction Lamp Diagnostic Switch . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Sensor Signal Faults (Trace) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Malfunction Lamp Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
MBS-1P Electrical Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

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1
MBS-1P Installation
Wabash MBS-1P ABS Introduction
The Wabash MBS-1P ABS enhances the original MBS-1 system by adding
Power Line Carrier (PLC) and expanding the number of configuration options.
The system can be configured with either two or four sensors and either one
or two pneumatic control modules. The Antilock Control Module (ACM) is
separate from the service brake relay valve, eliminating costly repairs
associated with relay valve failure. The choice of service brake relay can be
separate from choice of ABS. This is also an advantage when troubleshooting
the brake system.

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2
MBS-1P Installation
Figure 1, Wabash MBS-1P Antilock Brake System
MBS-1P System Components
Wabash’s MBS-1P system includes unique ABS components as well as
interfacing with standard trailer components (see Figure 1). Refer to
Figures 2 and 3 for part number and description of Wabash parts.
322UX023
R-12 Relay Valve
Power Cable
Malfunction
Lamp
Spring Brake
Control Valve
PCM/ECM
Gladhand
Malfunction Lamp
Connector
Diagnostic
Switch
J560
Connector
ABS Hub
Sensor

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3
MBS-1P Installation
Figure 2, MBS-1P System Components
Component Item Description Qty.
Req'd
Supplied
in Kit
322UX031
10800313 2S-1M w/168" Power Cable 1 yes
10800314 2S-1M w/30" Power Cable
10800358 2S-2M w/168" Power Cable
10800357 2S-2M w/30" Power Cable
10800353 4S-1M w/168" Power Cable
10800362 4S-1M w/30" Power Cable
10800349 4S-2M Side-by-Side w/168" Power Cable
10800361 4S-2M Side-by-Side w/30" Power Cable
10800360 4S-2M Axle-by-Axle w/168" Power Cable
10800359 4S-2M Axle-by-Axle w/30" Power Cable
14401359 ABS Wiring Harness 1 yes
14401744 ABS Malfunction Lamp 1 yes
Harness w/Diagnostic Switch
12S00475 MBS-1P Mounting Bracket 1 yes
(optional)
BLT00650 Bolt 1/4-20 x 3-1/2" Grade 8 (1M Sys.) 2 yes
BLT00732 Bolt 1/4-20 x 5-1/2" Grade 8 (2M Sys.) 2 yes
NUT00007 Nut 1/4-20 Nylon Insert Locknut 2
WSH00010 Washer 1/4" SAE Flat 2
10800225 Bosch ABS Sensor 2 yes
10800126 Wabco ABS Sensor
10800068 Midland ABS Sensor
10800226 Bosch ABS Sensor Clip 2 yes
10800009 Wabco ABS Sensor Clip
10800069 MidlandABS Sensor Clip

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4
MBS-1P Installation
Component Item Description Quantity
Required
14200428 Yellow ABS Malfunction Lamp 1 yes
14200018 Closed Back MalfunctionLamp Grommet 1 yes
14A00049 Straight Malfunction Lamp — no
Mounting Bracket
14A00050 90°Malfunction Lamp Mounting Bracket — no
12900570 Relay Valve 1 yes
25000972 MBS-1P Flash Code Decal 1 yes
Supplied
in Kit
322UX024
TO READ CURRENT FAULTS
PRESSTWO TIMES
(HOLD 2ND PRESS FOR
THREE SECONDS)
TO READ STORED FAULT
PRESSTHREE TIMES
(HOLD 3RD PRESS FOR
THREE SECONDS)
1) SYSTEMSWITH 1 PCM DO NOT UTILIZE FLASH
CODE 11
2) SYSTEMSWITH 2 SENSORS DO NOT UTILIZE
FLASH CODES 7-10 AND SENSORS MAY BE
LOCATED ON EITHER FRONT OR REAR AXLE
TO CLEAR STORED FAULTS
PRESS FOUR TIMES
(HOLD 4TH PRESS FOR
THREE SECONDS)
(ALLOWONE SECOND BETWEEN PRESSES)
X 2
FLASHTHREE TIMES
CURBSIDE SENSOR SIGNAL
(FRONT CURBSIDE ON 4 SENSOR SYSTEMS)
X 3
FLASH FOUR TIMES
CURBSIDE SENSOR CONNECTION
(FRONT CURBSIDE ON 4 SENSOR SYSTEMS)
X 4
FLASH FIVE TIMES
ROADSIDE SENSOR SIGNAL
(FRONT ROADSIDEON 4 SENSOR SYSTEMS)
X 5
FLASH SIX TIMES
ROADSIDE SENSOR CONNECTION
(FRONT ROADSIDEON 4 SENSOR SYSTEMS
X 6
FLASH SEVEN TIMES
CURBSIDE REAR SENSOR SIGNAL
X 7
FLASH EIGHT TIMES
CURBSIDE REAR SENSOR CONNECTION
X 8
FLASH NINE TIMES
ROADSIDE REAR SENSOR SIGNAL
X 9
X 3
X 4
FLASHTEN TIMES
ROADSIDE REAR SENSOR CONNECTION
X 10
FLASH ELEVEN TIMES
SECONDARYPCM FAULT
X 11
FLASHTWELVE TIMES
PRIMARYPCM FAULT
X 12
FLASH FOURTEEN TIMES
LOWVOLTAGETO ABS
X 14
FLASH FIFTEEN TIMES
ELECTRONIC CONTROL MODULE
X 15
FLASH CODE QUICK REFERENCE
DIAGNOSTIC SWITCH INPUT
NOTE
2S AND 4S SYSTEMS 4SSYSTEMS ONLY
DECAL PARTNUMBER: WN#25000972
PLC-4 TRUCKS COMPATIBLE
MBS-1P
TRAILERANTI-LOCK BRAKE SYSTEM
APRODUCT OF WABASHNATIONAL
®
Figure 3, MBS-1P System Components

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5
MBS-1P Installation
General Air Brake Requirements
FMVSS-121 identifies minimum requirements for air brake systems on
commercial vehicles built in the U.S. (Requirements in Canada are covered
under CMVSS-121 and are virtually identical.) These regulations cover
requirements for new construction. Once put into operation, proper use and
maintenance is covered under standards such as:
•FMCSR 393 – Covers required equipment
•FMCSR 396 – Covers inspection and repair.
The requirements for spring brake performance and operation, reservoir size
and air timing have not been changed with the introduction of ABS. Because
the addition of ABS components can have an affect on air brake timing, it is
important to verify acceptable performance on new ABS installations. The
maximum application and release times permitted under FMVSS-121 are
shown in Figure 4.
Figure 4, Air Timing Requirements
Measured at Brake Chamber 50 CI Reservoir Brake Chamber 50 CI Reservoir
Initial Condition 0 PSIG 0 PSIG 95 PSIG 5 PSIG
Towing Trailer 500 500 1000 1000
Converter Dolly 550 550 1100 1000
Single Trailer 600 N/A 1200 N/A
Apply Time (mSec)
From pedal
movement to
reach 60 PSIG
From pedal
movement to
reach 60 PSIG
From pedal
movement to
reach 5 PSIG
From pedal
movement to
reach 5 PSIG
Release Time (mSec)
322UX032

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6
MBS-1P Installation
ABS
Key Dates
March 1, 1997 Tractors must be equipped to provide full time power
to trailers.
March 1, 1998 Newly manufactured trailers must be equipped with ABS.
Some special use cases are exempt. (Refer to FMVSS-121
for specific details.)
April 1, 2000 ABS required on newly manufactured Canadian Vehicles.
March 1, 2001 Trailer malfunction lamp is required in the tractor cab.
March 1, 2008 Trailer mounted malfunction lamp no longer required.
ABS Design Requirements
Under FMVSS-1221, an approved ABS must automatically control the degree
of rotational wheel slip during braking by:
1. Sensing the rate of angular rotation of the wheels.
2. Transmitting signals regarding the rate of wheel angular rotation to one or
more controlling devices which interpret those signals and generate
responsive controlling output signals.
3. Transmitting those controlling signals to one or more modulators which
adjust brake actuating forces in response to those signals.
Type of ABS Required for Trailers
ABS control is required on trailers as follows:
•Full Trailers – Direct ABS Control is required on at least one front and
one rear axle.
•Semi Trailers and Dollies – Direct ABS Control is required on at least
one axle.
Direct Control refers to an axle that is equipped with wheel speed sensors
and is controlled by a modulator valve or valves in response to the wheel
speed sensor signals. If this valve(s) also controls the brakes of another
axle(s) that does not have sensors, the axle(s) is referred to as an indirectly
controlled axle(s).