Wave Pattern Observation Points; Abs Valve Relay Continuity Check - Mitsubishi PAJERO Workshop Manual

35B-28
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WAVE PATTERN OBSERVATION POINTS

Symptom
Wave pattern amplitude is too small
or is non-existent.
Excessive variation in wave pattern
amplitude
(However, this is not a problem if the
minimum amplitude is 120 mV or
higher.)
Noise appearing in wave pattern, or
distorted wave pattern
Caution
The wheel speed sensor cables move together with the movement of the front and rear
suspension. Accordingly, you should shake the sensor harnesses while observing the wheel
speed sensor output voltage wave patterns.
Petrol-powered vehicles
Diesel-powered vehicles
Valve relay
ABS <4WD> - ABS <4WD> -
Cause
Malfunction of wheel speed sensor
Excessive axle hub runout or offset
Malfunction of ABS-ECU earth
Open circuit in sensor
Open circuit in harness
Incorrect wheel speed sensor instal-
lation
Chipped or broken ABS rotor teeth

ABS VALVE RELAY CONTINUITY CHECK

Battery volt-
Valve relay
age
When
current
supplied
When
rent is sup-
plied
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On-vehicle Service On-vehicle Service
Remedy
Replace the sensor.
Replace the hub.
Repair
Replace the sensor.
Repair the harness.
Install the sensor correctly.
Replace the ABS rotor.
Terminal No.
1 2
no
is
cur-
3 4 5