W04200
Normal Signal Waveform
2 m/s / Division
GND
1 V / Division
W04200
Normal Signal Waveform
2 m/s / Division
GND
1 V / Division
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-237
391
Author:
Date:
2001 SIENNA (RM787U)
4
Check rear speed sensor and sensor rotor serrations.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
Connect the oscilloscope to the each of terminals RR+ - RR-
or RL+ - RL- of the ECU harness side connector.
CHECK:
Drive the vehicle at about 30 km/h (19 mph), and check the sig-
nal 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.
NG
Replace rear axle hub.
OK
5
Check front speed sensor and sensor rotor serrations.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
Connect the oscilloscope to the each of terminals FR+ - FR-
or FL+ - FL- of the ECU harness side connector.
CHECK:
Drive the vehicle at about 30 km/h (19 mph), and check the sig-
nal 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 ABS actuator assembly.
NG
Содержание RM787U
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