W04200
Normal Signal Waveform
GND
2 ms/Division
1V/Division
DI-21
3
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
2
Check for open and short in harness and connector between each speed sensor
and ECU (See page
IN-27
).
NG
Repair or replace harness or connector.
OK
3
Check speed sensor and rotor serrations.
Reference: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a)
Remove the ABS ECU with connector still connected.
(b)
Connect the oscilloscope to the terminals FR+, FL+, RR+
or RL+ and GND of the ABS ECU.
CHECK:
Drive the vehicle at 30 km/h (19 mph), and check the signal wa-
veform.
OK
Turn the IG swithch OFF, check and replace ABS
ECU.
NG
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Version 1.00 - 12/21/2010