1986 TOYOTA CAMRY V20 brake

Brake Actuator
CONNECTOR A
Anti±lock Brake System Computer
CONNECTORS (2WD)
Front Speed Sensor (LH)Front Speed Sensor (RH)
Rear Speed Sensor (R H
) Rear Speed Sensor ( LH
) Check ConnectorCONNECTOR C
CONNECTOR B
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±65

Anti±lock Brake System ComputerBrake Actuator
CONNECTOR A
CONNETORS (4WD)
Front Speed Sensor (LN)
Front Speed Sensor (RH)
Rear Speed Sensor (RH) Rear Speed Sensor (LH)
Deceleration Sensor Check Connector
CONNECTOR B
CONNECTOR C
Ts Connector
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±66

INITIAL CHECK
CHECK ACTUATOR OPERATION NOISE
(a) Start the engine and drive at a speed over 6 km/h
(4 mph).
(b) Check that the actuator operation noise is heard.
HINT: A initial check is carried out once each time after the
engine has been started and initial speed exceeds 6
km/h (4 mph). The respective functions, in order, of the 3
position solenoid and pump motor in the actuator are
checked. However, if the brake pedal is depressed, the ini-
tial check is not carried out, but is started after the pedal
has been released.
INSPECTION OF DIAGNOSIS SYSTEM
1. INSPECT BATTERY VOLTAGE
Inspect that the battery voltage is about 12 V.
2. CHECK THAT WARNING LIGHT TURNS ON
(a) Turn the ignition switch on.
(b) Check that the ºANTILOCKº warning light turns on for
3 seconds.
If not, inspect and repair or replace the fuse, bulb and wire
harness.
Diagnosis System
DESCRIPTION
If a malfunction occurs, the system will identify the prob-
lem and the computer will store the codes for the trouble
items.
At the same time, the system informs the driver of a mal-
function via the ºANTILOCKº warning light in the combina-
tion meter.
By turning on the ignition switch and disconnecting the
check connector, the trouble can be identified by the
number of blinks (diagnostic code) of the warning light.
In the event of two codes, that having the smallest num-
ber (code) will be identified first.
HINT: The warning light does not show the diagnostic
codes while the vehicle is running.
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±67

(c) In event of a malfunction, 4 seconds later the warning
light will begin to blink. Read the number of blinks.
(See DIAGNOSTIC CODE on page BR±69)
HINT: The first number of blinks will equal the first digit
of a two digit diagnostic code. After a 1.5 second
pause, the
2nd number of blinks will equal the 2nd number of a two
digit code. If there are two or more codes, there will be
a 2.5 second pause between each, and indication will
begin after 4.0 second pause from the smaller value
and continue in order to larger.
(d) If the system is operating normally (no malfunction),
the warning light will blink 2 times per second.
(e) Repair the system.
(f) After the malfunctioning components has been re-
paired, clear the diagnostic codes stored in the com-
puter.
(See page BR±70)
HINT: If you disconnect the battery cable while repair-
ing, all diagnostic codes in the computer will erased.
(g) Connect the check connector.
(h) Turn the ignition switch on, and check that the
ºANTILOCKº warning light goes off after the warning
light goes on for 3 seconds. 3. READ DIAGNOSTIC CODE
(a) Turn the ignition switch on.
(b) Disconnect the check connector from the actuator.
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±68

Deceleration sensor
Deceleration sensor installation
Wire harness and connector of
deceleration sensor
Pump motor of actuator locked or open circuit in pump motor
circuit in actuatorActuator inside wire harness
Pump motor relay
Wire harness and connector
of pump motor relay circuit Actuator inside wire harness
Solenoid relay
Wire harness and connector of solenoid
relay circuit
Speed sensor
Sensor rotor
Wire harness and connector of
speed sensor
Pump motor, relay and battery
Wire harness, connector and ground
bolt or actuator pump motor circuit Open or short circuit in 3 position solenoid of front right wheel
Actuator solenoid
Wire harness and connector of
actuator solenoid circuit Open or short circuit in 3 position solenoid of rear right wheel Open or short circuit in 3 position solenoid of front left wheel
Open or short circuit in 3 position solenoid of rear left wheel
Open circuit in front left or rear right wheel speed sensor
Open circuit in front right or rear left wheel speed
sensorRear right wheel speed sensor signal malfunction
Abnormally high battery voltage 0 6.2 V or higher) Front right wheel speed sensor signal malfunction
Front left wheel speed sensor signal malfunction
Rear left wheel speed sensor signal malfunction
Open or short circuit in deceleration sensor Short circuit in pump motor relay circuit Open circuit in pump motor relay circuit
Low battery voltage (9.5 V or lower) Open circuit in solenoid relay circuit
Short circuit in solenoid relay circuit
DIAGNOSTIC CODE
Battery
Voltage regulator
Malfunction in deceleration sensorWrong both rear axle hubs
Malfunction in computerRear sensor rotors
Computer Light Pattern
Trouble Part Diagnosi
s Code No.
± BRAKE SYSTEMlock Brake System (A.B.S.)BR±69

CLEARING OF DIAGNOSTIC CODES
CLEAR DIAGNOSTIC CODES
(a) Turn the ignition switch on.
(b) Disconnect the check connector from actuator.
HINT: Keep the vehicle stopped [vehicle speed 0 km/h
(0 mph)].
(c) Clear the diagnostic codes stored in computer by de-
pressing the brake pedal 8 or more times within 3
seconds.
(d) Check that the warning light shows the normal code.
(f) Check that the warning light goes off. (e) Connect the check connector.
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±70

Does warning light always come on or show
the normal code?
(ignition switch on)
Skidding noise occurs while A.B.S. working.
(A.B.S. works inefficiently) A.6.S. operates just before stopping at ordinary braking.
Brake pedal pulsates abnormally while A.B.S. is operating.
Does not come on for 3 seconds after ignition switch on.
Disconnect check connector.
(See page BR±68)Always comes on after ignition switch is turned on.
ºANTIL4CKº warning light comes on.
Troubleshooting
See diagnostic code.
(See page BR±69) A.6.S. operates at ordinary braking.
Continued on page
BR±72. ºANTILOCKº warning light
Comes on while running.
Braking inefficient.
Comes on and off.
Brake workingBrakes pull.
Problem
YESNo.
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±71

Does warning light go off when both the com-
puter connector and check connector are
.. disconnected? (Ignition switch on)Is there 10 ± 16 V between terminal IG on
computer wire harness side connector and
body ground? (ignition switch on)
Short circuit in wire harness between
computer terminal W and actuator ter-
minal W. Is connector of computer properly connected?
And are all terminals in the connector?Continued from page
BR±71.
Faulty power circuit.
Faulty computer.Faulty connector.
NO
(Come on)
YES
(Goes off¿ YES
YES
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±72