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3 Diagnostics, Troubleshooting and Testing
12
Meritor WABCO Maintenance Manual MM-0112 (Revised 05-13)
3 Diagn ostics, Troublesho oting and Testin g
General
Maintenance Information
There is no regularly scheduled maintenance required for the
Meritor WABCO ABS, ATC, RSC or ESC systems. However, this does
not change current vehicle maintenance requirements.
앫 Lamp Check: To ensure the ABS tractor lamp is operating,
drivers should check the lamp every time the vehicle is started.
When the vehicle is started, the ABS lamp should come on
momentarily. If it does not come on, it could mean a burned-out
bulb.
앫 ABS Wheel Speed Sensors: Check the wheel speed sensor
adjustment and lubricate the sensor and sensor clip whenever
wheel-end maintenance is performed. Use only Meritor
WABCO-recommended lubricant, as specified in Section 4.
ABS Indicator Lamp
Two ABS indicator lamps, one for tractor and one for trailer, let
drivers know the status of the system. Figure 3.1. The tractor ABS
lamp is also used to display tractor blink code diagnostics. The
location of the ABS indicator lamps varies depending on the make
and model of the vehicle.
Figure 3.1
ATC and RSC/ESC functions may share the same dash indicator
lamp. Therefore, understanding how the ABS and ATC/RSC/ESC
lamps work is very important.
앫 If the vehicle is equipped with ATC, but not RSC/ESC, when the
ignition is turned to the ON position, the ABS and ATC lamps will
light for approximately three seconds, and then both lamps will
turn off simultaneously. Figure 3.2.
앫 If the vehicle is equipped with ATC and RSC/ESC, when the
ignition is turned to the ON position, the ABS and ATC/RSC/ESC
will both light but the ATC/RSC/ESC lamp will stay lit briefly after
the ABS lamp goes out.
Figure 3.2
The ABS indicator lamp works as follows:
NOTE: If the ECU senses a tractor ABS fault during normal vehicle
operation, the ABS indicator lamp will come on and stay on.
Figure 3.1
1002000a
Figure 3.2
ATC
ABS
Both lamps come
on at ignition ON
and turn off after
approximately three
seconds. Vehicle
equipped with
ABS and ATC.
ATC
ABS
Both lamps come
on at ignition ON.
ATC/RSC/ESC lamp
stays on briefly after
ABS lamp goes out.
Vehicle equipped
with ABS, ATC
and RSC/ESC.
4005299d
ATC
ABS
ABS
ATC
- For E Version ECUs 1
- 12-Volt and 24-Volt Systems 1
- Contents 3
- 1 Introduction 5
- System Components 5
- ATC Components 10
- ATC Switch 10
- XX Orientation 11
- ZZ Orientation 12
- YY Orientation 12
- ESC Components 13
- Figure 2.8 14
- Hill Start Aid (HSA) 15
- Maintenance Information 16
- ABS Indicator Lamp 16
- Diagnostics 17
- TOOLBOX™ Software Diagnostics 17
- 4010611a 18
- 4010612a 18
- 4010613a 18
- 4010614a 18
- Definitions 19
- Clear Mode 20
- Blink Code Illustrations 22
- Blink Code Conditions 23
- Blink Code Identification 24
- Wheel Speed Sensor Testing 25
- Modulator Valve Testing 26
- BAYONET-STYLE CONNECTOR 27
- OPEN-STYLE CONNECTOR 27
- CAB MOUNT ECU’S: 28
- Figure 3.18 29
- 4010617a 30
- 4010619a 30
- 4010620a 30
- Electrical Checks 31
- Software 32
- Figure 3.26 or Figure 3.27 33
- PRESSURE SENSOR CONNECTOR 34
- ESC CAN Network Testing 35
- ESC Module Testing 35
- ESC Module Mounting 36
- ECU Circuit Testing 38
- Figure 3.44 40
- Figure 3.45 40
- 4 Component Replacement 41
- Hazard Alert Messages 41
- 472 500 30. 0 44
- MADE IN GERMANY 44
- 001 20/98 44
- DO NOT MOVE OR RELOCATE 49
- 6S/6M ABS 51
- 4S/4M ABS/ATC 51
- 4S/4M RSC/ATC 52
- 4S/4M ESC/ATC 52
- ECU Connector Pin Assignments 53
- ECU (Frame-mounted) 54
- 4004027d 55
- 4004030i 56
- Figure 6.8 57
- Figure 6.9 58
- Figure 6.10 59
- Figure 6.11 60
- Figure 6.12 61
- Figure 6.13 62
- Figure 6.14 63
- 7 SPN SID FMI Fault Codes 64
- SPN SID FMI Fault Code List 64
- 4010669a 88
- 4010670a 88
- 4010671a 88
- 8 Appendix I 89
- 9 Appendix II 91
- Troy, MI 48084-7121 98
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