1986 TOYOTA CAMRY V20 sensor

2. READ TYPE 6 CODE
(a) If while driving with the cruise control on, the system is
cancelled by a malfunction in either the actuator, speed
sensor, or control switch circuit, the main switch indicator
will blink 5 times.
(b) While driving at a speed of 16 km/h (10 mph) or less,
press the SET/COAST switch three times in two
seconds.
HINT: In order to retain the diagnostic code when a ma
function has occurred, always inspect with the ignition
and main switches on.
Should the power be cut, the diagnostic code will be
erased from the computer memory.
(e) Read the diagnostic code on the main switch indicator.
HINT:
wIndication codes appear in order from No. 11.
wIndication is stopped when vehicle speed is over 16
km/h (10 mph) or main switch is turned off.
wIf there is no indication code, perform diagnosis and in-
spection. (See page BE±74)
* If the set speed can be maintained when the speed control switch is again set at SET/COAST, there is no malfunction.*Vehicle speed decreases to 16 km/h (14 mph)
or more below set speed.
Resume/accel switch and set/coast switch
circuit is abnormal.Resume/accel switch circuit is abnormal.Speed sensor signal circuit is abnormal. Actuator circuit is abnormal. Indication code
Diagnosis
Normal.
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±72

INSPECT GROUND CONNECTION
Disconnect connector from meter (speed sen-
sor). Is there continuity between terminal B of
wire harness side connector and body ground?
INSPECT SPEED SENSOR CIRCUIT
Disconnect connector from computer.
Is there continuity between terminal A of wire harness
side connector and terminal 7 of computer?INSPECT SPEEDOMETER CABLE
Does the meter fluctuate when driving at a steady
speed?
INSPECT SPEED SENSOR OPERATION
Is speed sensor operation normal?
(See page BE±90)
Open circuit in wire harness between terminal A
of speed sensor and terminal 7 of computer.
Open circuit in wire harness between termi-
nal B and body ground.
INSPECTION OF SPEED SENSOR CIRCUIT
SPEEDOMETER CABLE
Turn ignition switch off.
Speed sensor faulty.
SPEED SENSOR
Meter cable faulty.
Replace computer.
COMPUTERYe s
Ye s
Ye s
Ye s
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±80

Cruise Control Computer Circuit
INSPECTION OF COMPUTER CIRCUIT
Disconnect the computer and inspect the connector on
wire harness side as shown in the below.
Remove CHARGE fuse and
ignition switch turned on with
parking brake lever released. Clutch pedal released or shifted
into only range except
ºNº and ºPº range
Remove CHARGE fuse and
ignition switch turned on with
parking brake lever pulled up.
Apply vacuum approx. 170
mmHg (fi.69 in.Hg, 22.7 kPa)Turn ignition switch and main
switch on
Turn ignition switch and main
switch off
Turn ignition switch and main
switch off Turn ignition switch and main
switch on
Clutch pedal depressed or
shifted into ºNº range Clutch Switch
(M/T) or Neutral
Start Switch (A/T)1 pulse each 44 cm
(15.75 in.) Stop Light Switch
and Release Valve
Turn resume/accel switch offTurn resume/accel switch on Control Switch
(indicator circuit)
Connection or
measure rtem
Turn set/coast switch off Turn set/coast switch on
Control Switch
(resunne/accel)Control Switch
(set/coast)
Vehicle moving slowlyBrake pedal depressed
Parking Brake
SwitchBrake pedal releasedBrake pedal released
10 ± Body ground
13 ± Body ground16 ± Body ground
17 ± Body ground
12 ± Body ground11 ± Body ground15 ± Body ground Tester connection
Stop Light Switch
3 ± Body ground
5 ± Body ground
7 ± Body ground
1 ± Body ground 9 ± Body groundBattery voltageSpecified value
Battery voltage
Battery voltageBattery voltage
Battery voltage No continuity
Vacuum SwitchControl Switch
Vacuum PumpNo continuity Approx. 68

Speed Sensor
No continuity Approx. 30

No continuity
Body GroundControl Valve
No voltageNo voltage
Continuity
Continuity ContinuityContinuity Resistance
ContinuityContinuity
Continuity Continuity
ContinuityNo voltage
No vacuum
ContinuityContinuityContinuity
ContinuityNo vohage
Condition
Resistance Stop FuseCheck for
VoltageVoltage Voltage
Voltage
Voltage4±142±14
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±88

Clutch Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals with
the switch free.
(Clutch pedal depressed)
(b) Check that there is no continuity between terminals
with the switch pin pushed.
(Clutch pedal released)
If continuity is not as specified, replace the switch.
Parking Brake Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminal and
switch set .nu^ with the switch free.
(Parking brake lever pulled up)
(b) Check that there is no cintinuity between terminal
and switch set nut with the switch pin pushed.
(Parking brake lever released)
If continuity is not as specified, replace the switch.
Neutral Start Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
Check that there is continuity between terminals 2 and 3
with switch position ºPº and ºNº ranges.
If continuity is not as specified, replace the switch.
Speed Sensor
INSPECTION OF SENSOR
INSPECT SENSOR CONTINUITY
Check that there is continuity between terminals A and6
four times per each revolution of the shaft.
If continuity is not as specified, replace the sensor.
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±90

ANTI±LOCK BRAKE SYSTEM (A.B.S.)
Description
wThe A.B.S. is a brake system which controls the wheel cylinder hydraulic pressure of all four wheels during
sudden braking and braking on slippery road surfaces, preventing the wheels from locking. This A.B.S.
provides the following benefits:
(1) Enables steering round an obstacle with a greater degree of certainty even when panic braking.
(2) Enables stopping in a panic brake while keeping the effect upon stability and steerability to a mini-
mum, even on curves.
wThe function of the A.B.S. is to help maintain directional stability and vehicle steerability on most road
conditions. However, the system cannot prevent the vehicle from skidding if the cornering speed limit is
exceeded.
wThe A.B.S. has a longitudinal deceleration sensor to match braking characteristics to the full±time four±
wheel drive. (For 4WD)
wIn case a malfunction occurs, a diagnosis function and fail±safe system have been adopted for the A.B.S.
to increase serviceability.
2WD (SEDAN)
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±56

From the wheel speed signals from each sensor, it calculates
acceleration, deceleration and slip values and sends signals to
the actuator to control brake fluid pressure. Detects the deceleration speed of the vehicle and sends a signal'
accordingly to the A.6.S. computer.
Controls the brake fluid pressure to each disc brake cylinder
through signals from the computer. Lights up to alert the driver when trouble has occured in the
Anti±lock Brake System. Detects the wheel speed of each of the left and right front
wheels.
Detects the wheel speed of each of the left and right rear wheels.
LOCATION OF SYSTEM PARTS FUNCTION OF COMPONENTS
Anti±lock Brake System Computer Deceleration Sensor (For 4WD)
ANTI LOCK Warning Light Front Speed Sensor
Rear Speed SensorComponentFunction
Actuator
WAGON
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±58

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