ABS <4WD> -
On-vehicle Service
ABS <4WD> -
On-vehicle Service
35B-28
WAVE PATTERN OBSERVATION POINTS
Symptom Cause Remedy
Wave pattern amplitude is too small
or is non-existent.
Malfunction of wheel speed sensor Replace the sensor.
Excessive variation in wave pattern
amplitude
Excessive axle hub runout or offset Replace the hub.
(However, this is not a problem if the
minimum amplitude is 120 mV or
higher.)
Malfunction of ABS-ECU earth Repair
Noise appearing in wave pattern, or
Open circuit in sensor Replace the sensor.
distorted wave pattern
Open circuit in harness Repair the harness.
Incorrect wheel speed sensor instal-
lation
Install the sensor correctly.
Chipped or broken ABS rotor teeth Replace the ABS rotor.
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.
ABS VALVE RELAY CONTINUITY CHECK
Battery volt-
Terminal No.
age
1 2 3 4 5
When no
current is
supplied
When cur-
rent is sup-
plied
Petrol-powered vehicles
Diesel-powered vehicles
Valve relay
Valve relay
www.WorkshopManuals.co.uk
Purchased from www.WorkshopManuals.co.uk
To Next Page
Loading...
Need help?
General
