Mitsubishi LANCER EVOLUTION-IV 1998, Workshop Manual, Page: 465 / 526

ABS –
Troubleshooting
35B-4
Code No.15: Wheel speed sensor (abnormal output
signal) Probable cause
This code is output when there is an abnormality in the output signal from any one
of the four wheel speed sensors while driving (except for an open circuit or short
circuit).
D
The four vehicle tires are of different sizes
D
Malfunction of wheel speed sensor
D
Malfunction of wiring harness or connector
D
Malfunction of ABS-ECU
D
Malfunction of wheel bearing
OK
Check the harness wire, and repair
if necessary.
D
Between each wheel speed sensor
and ABS-ECU
OK
Wheel bearing check
NG
Replace the ABS-ECU.
OK
ABS rotor check
NG
Repair OK
Check the trouble symptom.
OK
Check the following connector:
B-24
NG
Repair
OK
Check the trouble symptom.
OK
Wheel speed sensor output voltage
check (Refer to P.35B-17.)
NG
Wheel speed sensor check
NG
Replace
YES
Wheel speed sensor installation check
NG
Repair
Are the sizes of all four tires identical?
NO
Equip the vehicle with tires of identical
sizes.
NG