7 SPN, SID, FMI Fault Codes
78
WABCO Maintenance Manual MM-0112 (Revised 07-18)
Figure 7.12
Figure 7.12
SPN SID FMI
Blink
Code
Description
Warning
Light
System
Reaction
Cause Action
794 6 7 6 + 5
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.
794 6 8 3 + 5 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.
794 6 9 5 + 5
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.
794 6 10 3 + 5
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.
794 6 11 5 + 5
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.
794 6 12 5 + 5
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.
4010655a
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