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7 SPN SID FMI Fault Codes
67
Meritor WABCO Maintenance Manual MM-0112 (Revised 05-13)
Figure 7.8
SPN SID FMI
Blink
Code
Description
Warning
Light
System
Reaction
Cause Action
792 4 7 6 + 3
Incorrect Tone
Ring
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
Wheel speed signal
drops out
periodically at
speeds higher than
6 mph
• Check for damaged or missing teeth on tone ring.
• Verify tone ring is not corroded or with contamination.
792 4 8 3 + 3 Excessive Slip ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
Wheel slip over 16
seconds
continuously has
been detected.
• Adjust wheel sensor to touch tooth wheel.
• Check sensor gap.
• Check for loose wheel bearings or excessive hub runout.
792 4 9 5 + 3
Wires
Mismatched
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
A sensor lead from
an incorrect wheel
end has been
detected.
• Check for mismatch fault of another sensor.
• Verify correct harness location and wiring for sensor.
• Check for corroded or damaged wiring between the ECU and the ABS wheel speed
sensor.
792 4 10 3 + 3
Speed
Drop-Out
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
A temporary loss of
the ABS wheel
speed signal has
been detected.
• Adjust wheel speed sensor until it touches the tone ring.
• Check for loose wheel bearings or excessive hub runout.
• Check sensor wiring and connectors for intermittent contact.
• Check condition of ABS sensor head.
• Check mounting of tone ring and condition of teeth.
• Check condition and retention of ABS sensor spring clip.
• Check ABS sensor cable routing and clipping.
• Check for corroded or damaged wiring between the ECU and the ABS wheel speed
sensor.
• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output
voltage.
792 4 11 5 + 3
Abnormal
Speed
(Chatter)
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
Brake drag or
chatter has been
detected. Abnormal
vibrations detected
which affect sensor
signal.
• Check for loose wheel bearings or excessive hub runout.
• Check sensor wiring and connectors for intermittent contact.
• Check mounting of tone ring and condition of teeth.
• Check condition and retention of ABS sensor spring clip as well as the mounting block.
• Check for corroded or damaged wiring between the ECU and the ABS wheel speed
sensor.
• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output
voltage.
792 4 12 5 + 3
Frequency
Too High
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
A non-plausible
sensor frequency
has been measured.
• Check sensor wiring and connectors for intermittent contact.
• Check if brake at this location is operating correctly, i.e., potentially dragging.
• Check for corroded or damaged wiring between the ECU and the ABS wheel speed
sensor.
• Contact Meritor WABCO OnTrac at 866-OnTrac1 (668-7221) if the fault does not clear.
- 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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