1986 TOYOTA CAMRY V20 brake

INSPECTION OF REAR SPEED SENSOR AND SENSOR
ROTOR SERRATIONS (REFERANCE)
INSPECT REAR SPEED SENSOR AND SENSOR
ROTOR SERRATIONS BY USING AN OSCILLOSCOPE
(a) Connect an oscilloscope to the speed sensor connec-
tor.
(b) Run the vehicle at 20 km/h (12.4 mph), and inspect
speed sensor output wave.
(c) Check that C is 0.5 V or more.
If not as specified, replace the speed sensor.
(d) Check that B is 70% or more of A.
If not as specified, replace the rear axle hub. 3. VISUALLY INSPECT SENSOR ROTOR SERRATIONS
(a) Remove the two bolts and remove the torque plate
with brake cylinder.
(b) Remove the rotor disc.
(c) Inspect the sensor rotor serrations for scratches,
cracks, warping or missing teeth.
(d) Install the rotor disc and brake cylinder assembly with
two bolts.
Torque: 475 kg±cm 134 ft±lb, 47 N±m)
NOTICE: To prevent damage to the serrations, do not strike
the axle hub.
2. INSPECT SENSOR INSTALLATION
Check that the sensor installation bolt is tightened prop-
erly. If not, tighten the bolt.
Torque: 80 kg±cm (69 in.±lb, 7.8 N±m)
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±97

REMOVAL OF REAR SPEED SENSOR
1. DISCONNECT SPEED SENSOR CONNECTOR
(a) Remove the seat cushion.
(b) Disconnect the sensor connector, and pull out the
sensor wire harness.
(e) Remove the two clamp bolts holding the sensor wire
harness to the body and suspension arm.
2. REMOVE REAR BRAKE ASSEMBLY
(a) Remove the axle carrier mounting bolt and nut of up-
per side.
(b) Remove the two bolts and remove the disc brake as-
sembly.
(c) Suspend the disc brake so the hose is not stretched.
3. REMOVE ROTOR DISC
4. REMOVE REAR AXLE HUB
(a) Remove the four axle hub mounting bolts.
(b) Remove the rear axle hub.
(c) Remove the backing plate with parking brake as-
sembly and O±ring.
5. REMOVE SPEED SENSOR
Remove the bolts and remove the speed sensor from the
backing plate.
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±98

4. INSTALL REAR BRAKE ASSEMBLY
(a) Install the disc brake assembly and torque the two
mounting bolts.
Torque: 475 kg±cm (34 ft±Ib, 47 N±m)
(b) Install the axle carrier mounting bolt and nut of upper
side.
Torque:. 2,100 kg±cm (152 ft±lb, 206 N±m)
2. INSTALL REAR AXLE HUB
(a) Install the backing plate with parking brake assem-
bly in place.
(b) Install a new O±ring to the axle carrier.
(c) Install the rear axle hub with the four bolts.
Torque: 820 kg±cm (59 ft±Ib, 80 N±m)
5. CONNECT SPEED SENSOR CONNECTOR
(a) Install the wire harness with clamps and bolts in
place.
(b) Insert the wire harness connector to inside of the ve-
hicle, and connect the connector.
(c) Install the seat cushion.
INSTALLATION OF REAR SPEED
SENSOR
1. INSTALL SPEED SENSOR
Install the speed sensor to the backing plate with a bolt.
Torque: 80 kg±cm (69 in.±Ib, 7.8 N±m)
3. INSTALL ROTOR DISC
Align the hole on the axle hub and service hole on the
disc, and install the rotor disc.
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±99

INSPECTION OF REAR SPEED
SENSOR
1. INSPECT SPEED SENSOR
(a) Remove the rear seat cushion.
(b) Disconnect the speed sensor connector.
(c) Measure the resistance between terminals.
Resistance: 0.85 ± 1.50 k


If resistance value is not as specified, replace the sensor.
2. INSPECT SENSOR INSTALLATION
(a) Check that the sensor installation bolt is tightened
properly. If not, tighten the bolt.
Torque: 195 kg±cm (14 ft±Ib, 19 N±m)
(b) Check that there is no clearance between the sen-
sor and rear axle carrier as shown.
If there is clearance, replace the sensor. (d) Check that there is no continuity between each ter-
minal and sensor body.
If there is continuity, replace the sensor:
(e) Connect the speed sensor connector.
(f) Install the rear seat cushion.
Rear Speed Sensor (4WD)
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±100

INSPECTION OF REAR SPEED SENSOR AND
SENSOR ROTOR SERRATIONS (REFERENCE)
INSPECT REAR SPEED SENSOR AND SENSOR ROTOR
SERRATIONS BY USING AN OSCILLOSCOPE
(a) Connect an oscilloscope to the speed sensor connec-
tor.
(b) Run the vehicle at 20 km/h (12.4 mph), and inspect
speed sensor output wave.
(e) Check that C is 0.5 V or more.
If not as specified, replace the speed sensor.
(d) Check that B is 60% or more of A.
If not as specified, replace the rear drive shaft. 3. VISUALLY INSPECT SENSOR ROTOR SERRATIONS
(a) Remove the drive shaft.
(See page RA±21)
(b) Inspect the sensor rotor serrations for scratches,
cracks, warping or missing teeth.
(c) Install the drive shaft.
(See page RA±26)
NOTICE: To prevent damage to the serrations, do not strike
the drive shaft.
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±101

Anti±lock Brake System Circuit
INSPECTION OF SYSTEM CIRCUIT
1. INSPECT SYSTEM CIRCUIT WITH CONNECTOR
CONNECTED
(a) Remove the A.B.S. computer.
(b) Using a voltmeter with high impedance (10 K

/V
minimum), measure the voltage at each terminal and
body ground.
If the circuit is not as specified, check and repair or re-
place the trouble part shown in the table above.
Ignition switch on and ºANTI LOCKº warning light goes on
Ignition switch on and ºANTI LOCKº warning light goes on
Ignition switch on and ºANTI LOCKº warning light goes onIgnition switch on and ºANTI LOCKº warning light goes on Ignition switch on and ºANTI LOCKº warning light goes on
Ignition switch on and ºANTI LOCKº warning light goes on
Check connector connectedºANTI LOCKº
warning light bulb
Check connector disconnected
Check connector,
computer Actuator, control
relays
AST ± Body groundSRR ± Body groundSRl ± Body ground SFR ± Body groundSFL ± Body ground
W ± Body ground
T ± Body ground Tester Connection
Ignition switch on Ignition switch on
Ignition switch on Ignition switch on
Ignition switch on Ignition switch on
Battery voltage Battery voltage
Battery voltage Battery voitage Battery voltage
Battery voltage Battery voltageTrouble Part
About 0 V
About 0 V About 0 V About 0 V
About 0 V
About 0 V
About 0 V ConditionVoltage
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±102

2. INSPECT SYSTEM CIRCUIT WITH CONNECTOR
DISCONNECTED
(a) Disconnect the connectors from the computer, in-
spect at the wire harness side connector.
If the circuit is not as specified, check and repair or re-
place the trouble part shown in the table above.
(b) Connect the connectors, and install the comput-
er cover.
Ignition switch off and brake pedal depressed
Engine running and PKB lever returned Ignition switch off and brake pedal returned
Ignition switch on and PKB lever pulled
Parking broke switch,
level warning switchStop light switch,
stop light Voltage or
Resistance Value
Check connector,
wiring harness
Front RH speed
sensor
FrontrH speed
sensor Ts connector,
wiring harness
Rear RH speed
sensor
Rear RH speed
sensor
Rear LH speed
sensorRear LH speed
sensor Ts connector shorted
Ignition switch offIgnition switch off
Ignition switch off
Ignition switch off Ignition switch off Tester Connection
Ignition switch offIgnition switch off
Ignition switch off
Ignition switch off Ignition switch off Ignition switch off
Ignition switch offIgnition switch off
Ignition switch onBattery voltage
No continuity
Battery voltage
0.85 ± 1.30 k fl
0.85± 1.30k
Battery voltage
Wiring harnessWiring harness
Wiring harness Battery voltage
0.85 ± 1.50 k
0.85 ± 1.50 k

No continuityNo continuity
No continuityNo continuityNo continuityTrouble Part
65±100

ECU±IG fuse Chrak Item
50±80

About 6
ContinuityResistance
Resistance
About 5
ResistanceAbout 6 0
Resistance
ResistanceAbout 6

ResistanceContinuity Resistance
Resistance
ResistanceContinuity
ResistanceAbout 6

ResistanceContinuity
Continuity
Continuity
ContinuityContinuity Continuity
Continuity Continuity
About 0 v
Continuity Continuity
Continuity
Continuity
FOG fuse Condition
ActuatorActuator
Actuator Voltage
VoltageVortege
Actuator Voltage
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±103

1. REMOVE A.B.S. COMPUTER
(a) Remove the computer cover.
(b) Remove the five screws holding the computer to the
computer bracket.
(e) Pull out the wire harness from the clamp on the
bracket, and pull out the connector from the clamp
on the bracket.
(d) Disconnect the three connectors, and remove the
A.B.S. computer.
2. REMOVE DECELERATION SENSOR
Remove the two screws, and remove the deceleration
sensor.
NOTICE: Do not drive without normal installation of decel-
eration sensor and computer assembly.
REMOVAL AND INSTALLATION OF A.B.S.
COMPUTER AND DECELERATION SENSOR
(For 4WD)
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±104