sensor TOYOTA CAMRY V20 1986 Service Information

Taillight Failure Sensor
INSPECTION OF SENSOR
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the failure sensor and
ground the terminal 3 on the wire harness side.
(b) Remove the CHARGE fuse and turn the ignition
switch ON, check that the bulb lights.
If bulb does not light, inspect the bulb.
2. INSPECT SENSOR CIRCUIT
Disconnect the failure sensor connector and inspect the
connector on the wire harness side as shown in the chart.
If circuit is as specified, replace the relay.
Stop light switch ON (Brake pedal depressed)Stop light switch OFF (Brake pedal released)
Turn light control switch TAIL or HEAD Turn ignition switch to OFF or ACC Turn ignition switch to OFF or ACC
Turn light control switch OFF Turn ignition switch ON
Remove CHARGE fuse
Turn ignition
switch ON
Install CHARGE fuse
Tester
connectionSpecified value
Battery voltage
Battery voltage
Battery voltageBattery voltage
No voltage Continuity
No voltageContinuityNo vottage No voltage Continuity
ContinuityNo voltage
Continuity ContinuityConditionCheck for
Voltage Voltage
VoltageAlways
AlwaysAlways
± BODY ELECTRICAL SYSTEMLightingBE±20

Light Control Rheostat
TAIL Fuse
IGN Fuse
Water Temperature Sender Gauge
Ground
Seat Beh Warning Relay
Brake Fluid Level Warning Switch and Parking
Brake Switch
CHARGE Fuse
TCCS ECU
A.B.S. ECU
Cruise Control ECU and ECT ECU
Ground
Fuel Sender Gauge Terminal 3
Fuel Sender Gauge Terminal 2
GAUGE Fuse
DOME Fuse
Door Courtesy Switch
Low Oil Pressure Switch
Light Failure Sensor
Combination Meter and Gauges
(w/o Tachometer)
Turn Signal Switch Terminal 28
Ground
Turn Signal Switch Terminal 25
Turn Signal Switch Terminal 23 (USA)
HEAD±HI (RH) Fuse (CANADA)
A/T Oil Temperature Switch
COMBINATION METER CIRCUIT
Wiring Connector Side
No.
± BODY ELECTRICAL SYSTEMCombination MeterBE±32

Light Control Rheostat
TAIL Fuse
IGN Fuse
Water Temperature Sender Gauge
Ground
Seat Belt Warning Relay
Brake Fluid Level Warning Switch and Parking
Brake Switch
CHARGE Fuse
TCCS ECU ,
A. B. S. ECU
Cruise Control ECU and ECT ECU
Ground
Fuel Sender Gauge Terminal 3
Fuel Sender Gauge Terminal 2
. GAUGE Fuse
DOME Fuse
Door Courtesy Switch
Low Oil Pressure Switch
Light Failure Sensor
Turn Signal Switch Terminal 28
Ground
Turn Signal Switch Terminal 25
Turn Signal Switch Terminal 23 (USA)
HEAD±HI (RH) Fuse (CANADA)
A/T Oil Temperature Switch
Igniter
Combination Meter and Gauges
(w/ Tachometer)
COMBINATION METER CIRCUIT
Wiring Connector Side
No.
± BODY ELECTRICAL SYSTEMCombination MeterBE±33

Speedometer
INSPECTION OF SPEEDOMETER
INSPECT SPEEDOMETER OPERATION (ON±VEHICLE)
(a) Using a speedometer tester, inspect the speedometer
for allowable indication error and check the operation
of the odometer.
HINT: Tire wear and tire over or under inflation will increase
the indication error.
Speed Sensor
INSPECTION OF SPEED SENSOR
INSPECT SPEED SENSOR
Check that there is continuity between terminals A and B
four times per each revolution of the shaft.
If operation is not as specified, replace the speedometer.If error is excessive, replace the speedometer.
(b) Check the speedometer for pointer vibration and ab-
normal noise.
HINT: Pointer vibration can be caused by a loose
speedometer cable.
Standard indication
(km/h)Standard indication
(mph)Allowable range
(mph)
Allowable range
(km/h)
± BODY ELECTRICAL SYSTEM. Combination MeterBE±35

Vacuum Switch
(w/ A.B.S.) (w/o A.B.S.)ECT Computer
Wire Harness Side
Alternator
Wire Harness SideBrake Fluid Level
Warning Switch
Connectors
Cruise Control Computer
Neutral Start SwitchStop Light Switch
Parking Brake SW
Vacuum PumpSpeed SensorControl SW
Clutch SW Main SW
Actuator
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±70

Diagnosis System
OUTPUT OF DIAGNOSTIC CODES
1. READ TYPE A CODE
(a) Turn the ignition switch on.
(b) Turn the set/coast switch on, and keep it on.
(e) Push the main switch on.
(d) Turn the set/coast switch oft.
(e) Meet the conditions listed below.
(f) Read the diagnostic code on the main switch indica-
tor.
HINT:
wTo save time performing the next test, do not turn off the
ignition switch when steps (a) ± (f) are completed.
wChecking of No. 4 code is done with the vehicle jacked
up and the engine idling.
wIf there is no indication code, perform diagnosis ±and
inspection. (See page Be±74)
Each cancel switch on (Stop light switch,
Parking brake switch, Clutch switch,
Neutral start switch)Each cancel switch circuit is
normal.Set/coast switch circuit is
normal.
Vacuum switch circuit is
normal.Resume/ accel switch
circuit is normal.
Speed sensor circuit is
normal.Speed sensor circuit is
normal.
Drive 30 km/h 0 9 mph) or belowDrive 40 km/h (25 mph) or overResume/accel switch on Set/coast switch on
Vacuum switch on
Indication code ConditionsDiagnosisNo.
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±71

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