ANTILOCK BRAKE SYSTEM (ABS) 5E2-23
INSPECTION
Step Action Yes No
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?
Go to Step 2. Replace ABS wheel
speed sensor
assembly.
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?
Go to Step 3. ABS wheel speed
sensor circuit
shorted to power.
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?
Go to Step 4. Circuit open or
shorted to ground.
4 1) Remove applicable ABS wheel speed sensor.
2) Check sensor for damage or foreign material attached.
Is it in good condition?
Go to Step 5. Clean, repair or
replace.
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?
Go to Step 6. Clean, repair or
replace.
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?
Go to Step 7. Replace ABS wheel
speed sensor.
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?
Substitute a known-
good ABS hydrau-
lic unit/control mod-
ule assembly and
recheck.
Replace sensor and
recheck.
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