Lexus ES300 (2002 year). Manual - part 319
W04200
Normal Signal Waveform
1 V / Division
2 m/s / Division
GND
F10178
OK
NG
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
05-257
410
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK HARNESS AND CONNECTOR(SKID CONTROL SENSOR - BRAKE
ACTUATOR ASSEMBLY)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
4
INSPECT SENSOR AND SENSOR ROTOR SERRATIONS
(REFERENCE) INSPECTION USING OSCILLOSCOPE
(a)
Connect the oscilloscope to the terminals RR+ - RR- or
RL+ - RL- of the skid control ECU.
(b)
Drive the vehicle with about 20 km/h (12 mph), and check
the signal waveform.
HINT:
As the vehicle speed (rpm of the wheels) increases, a
cycle of the waveform becomes shorter and the fluctua-
tion in the output voltage becomes greater.
When noise is identified in the waveform on the oscillo-
scope, error signals are generated due to the speed sen-
sor rotor’s scratches, looseness or foreign matter depos-
ited on it.
OK
CHECK AND REPLACE BRAKE ACTUATOR
ASSY
NG
5
INSPECT SKID CONTROL SENSOR INSTALLATION
(a)
Check the sensor installation.
OK:
There is no clearance between the sensor and rear
axle carrier.
NG
REPLACE SKID CONTROL SENSOR
NOTICE:
Check the speed sensor signal last (See page
OK