Suzuki GA413 Service Manual page 276

5E-22 ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL)
INSPECTION
STEP
1 1) Disconnect applicable sensor connector with
ignition switch OFF.
2) Measure resistance between sensor terminals.
Resistance of wheel speed sensor: 1.2 – 1.6 kW
(at 20 C, 68 F)
3) Measure resistance between each terminal and body
ground.
Insulation resistance: 1MW or higher
Were measured resistance values in step 2) and 3) as
specified? (See Fig. 1)
2 1) Ignition switch OFF.
2) Disconnect connector from ABS hydraulic unit / control
module assembly. (See Fig. 2)
3) Check for proper connection to ABS hydraulic
unit / control module assembly at each sensor termi-
nal.
4) If OK then, turn ignition switch ON and measure
voltage between sensor positive terminal of module
connector and body ground.
Is it 0V?
3 1) Ignition switch OFF.
2) Connect connector to sensor.
3) Measure resistance between sensor terminals at
module connector.
4) Measure resistance between sensor positive terminal
and negative terminal of module connector, between
positive terminal and body ground.
Are measured resistance values within each specified
range described in above step 1)?
4 1) Remove wheel speed sensor.
2) Check sensor for damage or foreign material being
attached.
Is it in good condition? (See Fig. 3)
5 Check visually through wheel speed sensor installation
hole for following.
D Rotor serration (teeth) neither missing or damaged.
D No foreign material being attached.
D Rotor not being eccentric.
D Wheel bearing free from excessive play.
Are they in good condition? (See Fig. 4)
6 1) Install sensor to knuckle or axle housing.
2) Tighten sensor bolt to specified torque and check that
there is not any clearance between sensor and
knuckle or axle housing. (See Fig. 5)
Replace sensor if any.
Referring to item OUTPUT VOLTAGE INSPECTION of
FRONT WHEEL SPEED SENSOR, check output voltage
or waveform of sensor. Is proper output voltage or
waveform obtained?
ACTION YES
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Substitute a known-
good ABS hydraulic
unit /control module
assembly and recheck.
NO
Replace sensor.
Sensor positive
circuit shorted to
power.
Circuit open or
shorted to ground.
Clean or replace
sensor.
Clean, repair or
replace.
Replace sensor
and recheck.