7
SPN, SID, FMI Fault Codes
73
WABCO
Maintenance Manual MM-0112 (Revised 07-18)
Figure 7.7
Figure 7.7
SPN
SID
FMI
Blink
Code
Description
W
arning
Light
System
Reaction
Cause
Action
Right Rear
Wheel Speed Sensor
792
4
1
3 + 3
Air Gap
ABS
WL
ABS Wheel
Disab
led
ESC/RSC/A
TC/
HSA Disab
led
Sensor air gap is too
large
, sensor output
v
oltage is too lo
w
b
ut is high enough to
be read b
y
ECU
.
•
Adjust wheel sensor to touch tone r
ing.
•
Chec
k condition of ABS sensor head.
•
Chec
k f
o
r loose wheel bear
ings or e
xcessiv
e hub r
unout.
•
Chec
k mounting of ABS tone r
ing and condition of teeth.
•
Chec
k condition and retention of ABS sensor spr
ing clip
.
•
Chec
k ABS sensor cab
le routing and clipping.
•
T
u
rn
the wheel at half a re
v
o
lution per second and v
e
ri
fy 0.2 A
C
v
olt sensor output
v
o
ltage
.
792
4
2
5 + 3
Incorrect
Tire
ABS
WL
ABS Wheel
Disab
led
ESC/RSC/A
TC/
HSA Disab
led
System has
detected a
significant diff
erence
in the propor
tion of
tire diameter to
n
umber of tone r
ing
teeth betw
een wheel
ends
. 10% (+/-2%)
•
Chec
k f
o
r tire siz
e mismatch.
•
Chec
k f
o
r correct n
u
mber of tone r
ing teeth.
•
V
e
ri
fy that ECU is prog
ra
mmed f
o
r the correct v
ehicle
.
•
Contact W
A
BCO or OEM.
792
4
3
4 + 3
Shor
ted to
UBA
T
T
ABS WL
ABS Wheel
Disab
led
ESC/RSC/A
TC/
HSA Disab
led
Contin
uity betw
een
the sensor
connection and
batter
y v
oltage
(shor
t circuit) is
detected.
•
V
e
ri
fy 900-2000 ohms resistance through sensor circuit.
•
V
e
ri
fy no DC v
o
ltage through sensor circuit K
e
y ON.
•
Chec
k f
o
r corroded or damaged wir
ing betw
een the ECU and the ABS wheel speed
sensor
.
792
4
4
4 + 3
Shor
ted to
Ground
ABS WL
ABS Wheel
Disab
led
ESC/RSC/A
TC/
HSA Disab
led
Contin
uity betw
een
the sensor
connection and
g
round (shor
t circuit)
is detected.
•
V
e
ri
fy 900-2000 ohms resistance through sensor circuit.
•
Chec
k f
o
r contin
uity betw
een the ABS sensor connection and g
round.
•
Chec
k f
o
r corroded or damaged wir
ing betw
een the ECU and the ABS wheel speed
sensor
.
•
V
e
ri
fy wheel speed sensor wires are not s
w
itched left/r
ight.
792
4
5
4 + 3
Open Circuit
ABS
WL
ABS Wheel
Disab
led
ESC/RSC/A
TC/
HSA Disab
led
An open circuit has
been detected, i.e
.
ECU detects a
disconnected wheel
speed sensor
.
•
Chec
k sensor
, sensor cab
le and connectors to v
e
ri
fy no loose or damaged connection.
•
V
e
ri
fy 900-2000 ohms resistance through sensor circuit.
•
V
e
ri
fy wheel speed sensor wires are not s
w
itched left/r
ight.
792
4
6
4 + 3
Shor
t Circuit
ABS
WL
ABS Wheel
Disab
led
ESC/RSC/A
TC/
HSA Disab
led
Contin
uity
interr
uption betw
een
the sensor
connections (shor
t
circuit) has been
detected.
•
V
e
ri
fy 900-2000 ohms resistance through sensor circuit.
•
Chec
k f
o
r corroded or damaged wir
ing betw
een the ECU and the ABS wheel speed
sensor
.
4010650
a
