Appendix III — Additional ABS Information
48
Meritor WABCO
Maintenance Manual MM-0112 (Revised 07-05)
7 Appendix III
—
Additional ABS Information
Troubleshooting
Meritor WABCO ABS Valve Package
This troubleshooting information is a reference tool to help identify possible malfunctions of the ABS modulator or relay valves. It does not take
the place of diagnostic tests or other service instructions.
Condition
Possible Cause
Recommended Action
Air constantly leaks
from exhaust port of
relay valve.
Internal relay valve problem.
Replace the relay valve.
Air leaks from exhaust
port of ABS modulator
valve or relay valve
when parking brake is
released.
Parking brake problem.
OR
Anti-compound 2-way check valve problem.
Service the appropriate component.
앫
Refer to manufacturer’s service manual for
instructions.
Rear service brakes
releasing slowly
(brakes dragging).
Kinked air line.
Dirt buildup inside relay valve.
Inspect/repair lines, brakes.
If the condition is not corrected:
앫
Replace the relay valve.
Valves don’t cycle at
power-up.
OR
Indicator lamp comes
on (blink code or
diagnostic tool
indicates electrical
problem with ABS
valve).
Broken wire.
OR
Loose or broken terminal connection.
Corroded connector pins.
OR
Problem with solenoid.
Check the wires and connections.
앫
Make repairs as needed.
If condition is not corrected:
Measure
resistance across each valve solenoid coil
terminal and ground on the ABS modulator valve
to ensure 4.0 to 8.0 ohms.
앫
If
greater than 8.0 ohms,
clean the valve and
repeat the measurement.
— If cleaning does not solve the problem,
replace the ABS modulator valve.
앫
If
less than 4.0 ohms,
replace the ABS
modulator valve.
ABS valve package
damaged.
Road hazards.
OR
Vehicle damage.
Replace the complete ABS valve package or
individual component as required.
OPEN-STYLE CONNECTOR
GROUND
TERMINAL
EXHAUST
SOLENOID
(BLUE WIRE)
INLET SOLENOID
(BROWN WIRE)
BAYONET-STYLE CONNECTOR
EXHAUST
SOLENOID
(BLUE WIRE)
INLET
SOLENOID
(BROWN WIRE)
GROUND
TERMINAL
Summary of Contents for X3-45 Multiplex
Page 1: ...COACH MANUFACTURER MAINTENANCE MANUAL X3 COACHES PA1562 4th edition...
Page 13: ...Section 00 GENERAL INFORMATION 11 PA1562 FIGURE 16 METRIC US STANDARD CONVERSION TABLE 00005...
Page 14: ...Section 00 General Information PA1562 12 FIGURE 17 CONVERSION CHART 00006...
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Page 253: ...FAULT CODE MANUAL Created on 00 04 25 15 30 1 FAULT CODE MANUAL B7L B7TL B12...
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Page 439: ...Forward and Rear Axle Carrier Diagnostic Flowcharts TP 99125 Issued 12 99 TECHNICAL BULLETIN...
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Page 500: ...Notes Copyright 2002 Maintenance Manual MM 0204 Page 4 ArvinMeritor Inc Issued 08 02...
Page 504: ...Notes Copyright 2002 Maintenance Manual MM 0204 Page 8 ArvinMeritor Inc Issued 08 02...
Page 526: ...16 BW2158 Honeywell Commercial Vehicle Systems Company 4 2001 Printed in USA...
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Page 941: ...Initial Installation Section 2 Initial Installation Installation 14 Maintenance Tips 15...
Page 965: ...Glossary Section 5 Glossary Glossary 39...
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Page 1197: ...Compressor 62 11052 Rev A WORKSHOP MANUAL for MODEL 05G TWIN PORT COMPRESSOR R...
Page 1198: ...WORKSHOP MANUAL COMPRESSOR MODEL 05G TWIN PORT...
Page 1221: ...Compressor 62 11053 Rev B SERVICE PARTS LIST for MODEL 05G TWIN PORT COMPRESSOR 1 2 3 4 5 6 R...
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Page 1265: ...Section 23 ACCESSORIES PA1562 5 FIGURE 2 AUDIO VIDEO CONNECTIONS...
Page 1278: ...Section 23 ACCESSORIES PA1562 18 FIGURE 26 FUNCTIONING OF LAVATORY 23051...
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Page 1379: ...LPCM OUTPUT...
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