Suzuki GRAND VITARA XL-7 Owner's Manual page 148

INSPECTION
Step
1 1) Disconnect applicable ABS wheel speed sensor coupler
with ignition switch OFF.
2) Measure resistance between terminals of ABS wheel
speed sensor. Refer to "FRONT WHEEL SPEED SEN-
SOR" and/or "REAR WHEEL SPEED SENSOR" in this
section.
Is measured resistance value as specified?
2 1) Turn ignition switch OFF.
2) Disconnect ABS hydraulic unit/control module connec-
tor.
3) Check for proper connection to ABS control module at
each sensor terminal.
4) If OK, then turn ignition switch ON and measure voltage
between sensor terminal of module connector and body
ground.
Is it 0V?
3 1) Turn ignition switch OFF.
2) Connect ABS wheel speed sensor coupler.
3) Measure resistance between the following points.
• Both ABS hydraulic unit/control module connector termi-
nals of the corresponding sensor.
This check result should be the same as above Step 1.
• Either terminal of wheel speed sensor coupler and body
ground.
This check result should be no continuity.
Are both check results OK?
4 1) Remove applicable ABS wheel speed sensor.
2) Check sensor for damage or foreign material attached.
Is it in good condition?
5 Check front and/or rear sensor ring for the following
(remove rear drum as necessary) :
• Rotor serration (teeth) neither missing nor damaged.
• No foreign material being attached.
• Rotor not being eccentric.
• Wheel bearing free from excessive play.
Are they in good condition?
6 1) Install ABS wheel speed sensor to knuckle.
2) Tighten sensor bolt to specified torque and check that
there is no clearance between sensor and knuckle.
Is it OK?
7 Referring to "Reference" of "FRONT WHEEL SPEED SEN-
SOR" and/or "Reference" of "REAR WHEEL SPEED SEN-
SOR" in this section, check output voltage or waveform.
Is specified voltage and/or waveform obtained?
Action
ANTILOCK BRAKE SYSTEM (ABS) 5E2-23
Yes
Go to Step 2. Replace ABS wheel
speed sensor
assembly.
Go to Step 3. ABS wheel speed
sensor circuit
shorted to power.
Go to Step 4. Circuit open or
shorted to ground.
Go to Step 5. Clean, repair or
replace.
Go to Step 6. Clean, repair or
replace.
Go to Step 7. Replace ABS wheel
speed sensor.
Substitute a known- Replace sensor and
good ABS hydrau- recheck.
lic unit/control mod-
ule assembly and
recheck.
No