Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / ABS with EBD system / Right/Left rear speed sensor circuit / Inspection procedure
Toyota Corolla (E120): Inspection procedure
Hint
: start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not using the hand–held tester.
1 Read value of hand–held tester(skid control sensor)
- Check that there is no difference between the speed value output from
the speed sensor displayed
by the hand–held tester and the speed value displayed by the speedometer
when driving the vehicle.
Ok: there is almost no difference in the displayed speed value.
Hint
: there is tolerance of ± 10 % in the speedometer indication.
2 Inspect skid control sensor
- Disconnect the skid control sensor connector.
- measure resistance between terminals 1 and 2 of the skid
control sensor connector.
Ok: resistance: 2.2 Kw or less
- measure resistance between each of terminals 1 and 2 of
skid control sensor connector and body ground.
Ok: resistance: 1 mw or higher
Notice
: check the speed sensor signal last
3 Check harness and connector(skid control sensor – skid control ecu)
- Check for open and short circuit in harness and connector between each skid control sensor and skid control ecu
4 Inspect sensor and sensor rotor serrations
(Reference) inspection using oscilloscope
- connect the oscilloscope to the terminals rr+ – rr– and rl+ – rl– of the skid control ecu.
- drive the vehicle at about 30 km/h (19 mph), and check the signal waveform.
Hint
:
- as the vehicle speed (wheel revolution speed) increases, a cycle of the waveform becomes shorter and the fluctuation in the output voltage becomes greater.
- When noise is identified in the waveform on the oscilloscope, error signals are generated due to the speed sensor rotor’s scratches, looseness or foreign matter deposited on it.
5 Inspect sensor installation
- Check the sensor installation.
Ok: there is no clearance between the sensor and rear axle carrier.
Notice
: check the speed sensor signal last
6 Inspect skid control sensor tip
- Remove the skid control sensor .
- check the sensor tip.
Ok: no scratches or foreign objects on the sensor tip.
Notice
: check the speed sensor signal last
7 Inspect sensor rotor
- Check the sensor rotor serrations.
Ok: no scratches, missing teeth or foreign objects.
Notice
: check the speed sensor signal last
Check and replace brake actuator assy
Notice
: do not reuse skid control sensor.
Other materials:
Exhaust gas precautions
Harmful substance to the human body is included in exhaust gases if inhaled.
CAUTION
Exhaust gases include harmful carbon monoxide (CO), which is colorless and odorless.
Observe the following precautions.
Failure to do so may cause exhaust gases enter the vehicle and may lead to an
accident c ...
Replacement
1. Remove hood sub–assy
2. Remove cylinder head cover no.2
3. Remove battery
4. Remove battery carrier
Remove the 4 bolts and battery carrier.
5. Remove air cleaner assembly with hose
6. Remove floor shift cable transmission control shift
Remove the nut from the control shaf ...
Overhaul
Hint:
overhaul the rh side by the same procedures with lh side.
1. Remove rear wheel
2. Drain brake fluid
Notice:
wash the brake fluid off immediately if it comes into contact with any painted
surface.
3. Remove rear brake drum sub–assy
Release the parking brake lever, and remove t ...