Mitsubishi 3000GT Service Manual page 848

SERVICE BRAKES - Anti-lock Braking System Troubleshooting
Check flow connected with wheel
speed sensor
Is the resistance value of the wheel speed
Yes
Is the resistance value with the ECU con- ----+ Harness wire for wheel speed
Standard value:
Front 0.8-1.2 Wz
Rear 0.6-0.8 kQ
Yes
NOTE
When checking with an oscilloscope, first measure voltage varia-
tions in the wheel speed sensor output. (Refer to P.35-75.)
sensor
No
sensor circuit is broken
Is the standard value for the
gap between the wheel speed
sensor and rotor within the
range?
Standard value:
Front 0.3-0.9 mm
Rear 0.2-0.7 mm
Yes
Is the wheel speed sensor ro-
tor normal, with no missing or
damaged teeth?
Yes
Check the output of each
wheel speed sensor with an
oscilloscope, including the
waveform. (Refer to mea-
surement of wheel speed
sensor output voltage varia-
tions on P.3575.)
Is the output voltage for each
wheel speed sensor over the
standard value and is the wa-
veform normal?
Yes
If the above checks are nor-
ABS ECU when this diagnos-
tic trouble code re-occurs
often.
sor
Repair harness.
No
sing or damaged teeth.
No
Recheck if below the stan-
dard value or if the sensor
has a poor waveform. Re-
place sensor or rotor.
- Replace the ABS ECU and
check that the trouble code
does not reoccur.