TOYOTA CAMRY V20 1986 Service Information

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

Fuel Gauge
INSPECTION OF GAUGE
1. INSPECT RECEIVER GAUGE OPERATION
(a) Disconnect the connector from the sender gauge.
(b) Turn the ignition switch ON, check that the receiver
gauge needle moves to EMPTY.
(e) Connect the terminals 3 and 4 on the wire harness
side connector through a 3.4W test bulb, check that
the bulb lights and receiver gauge needle moves to-
wards the full side.
HINT: Because of the silicon oil in the gauge, it will take
a short time for the needle to stabilize.
If operation is not as specified, test the receiver gauge.
Tachometer
INSPECTION OF TACHOMETER
INSPECT TACHOMETER OPERATION (ON±VEHICLE)
(a) Connect a tune±up test tachometer, and start the en-
gine.
NOTICE:
wRemoving the connection of the tachometer will
damage the transistors and diodes inside.
wWhen removing or installing the tachometer, be
careful not to drop or subject it to heavy shocks.
(b) Compare the tester and tachometer indications.
If error is excessive, replace the tachometer.
Standard indication
(rpm)Allowable range
(rpm) DC 13.5 V 25°C (77°F)
± BODY ELECTRICAL SYSTEMCombination MeterBE±36

Fuel Level Warning
INSPECTION OF LEVEL WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the sender gauge.
(b) Connect terminals 1 and 2 on the wire harness side-
connector.
(e) Turn the ignition switch ON, check that the warning
light lights.
If the warning light does not light, test the bulb.
2. INSPECT WARNING SWITCH OPERATION
(a) Apply battery voltage to terminals 1 and 2 through a
3.4W test bulb, check that the bulb lights.
HINT: It will take a short time for the bulb to light.If resistance value is not as specified, replace the receiver
gauge.
3. INSPECT SENDER GAUGE OPERATION
(a) Connect a series of three 1.5V dry cell batterys.
(b) Connect the positive (+) lead from the dry cell batter-
ys to terminal 3 through a 3.4W test bulb and the neg-
ative (±) lead to terminal 4.
(c) Check that the voltage rises between terminals 3 and
4 as the float is moved from the top to bottom posi-
tion. 2. MEASURE RECEIVER GAUGE RESISTANCE
Measure the resistance between terminals.
(d) Measure the resistance between terminals 3 and 4
for each float position.
If operation is not as specified, replace the sender
gauge.
Between terminals
Resistance (W)
Resistance (W)
All±Trac/4WD Float position
mm (in.)
FWD
± BODY ELECTRICAL SYSTEMCombination MeterBE±37

Water Temperature Gauge
INSPECTION OF GAUGE
1. INSPECT RECEIVER GAUGE OPERATION
(a) Disconnect the connector from the sender gauge.
(b) Turn the ignition switch ON, check that the receiver
gauge needle moves to COOL.
(c) Ground the terminal on the wire harness side con-
nector through a 3.4W test bulb.
(d) Turn the ignition switch ON, check that the bulb lights
and the receiver gauge needle moves to the hot side.
If operation is not as specified, measure the receiver
gauge resistance. (b) Submerge the switch in fuel, check that the bulb goes
out.
If operation is not as specified, replace the sender gauge.
2. MEASURE RECEIVER GAUGE RESISTANCE
Measure the resistance between terminals.
If resistance value is not as specified, replace the re-
ceiver gauge.
Negative (±) lead
from ohmmeterResistance (
)
Positive (+) lead
from ohmmeter Between terminals
± BODY ELECTRICAL SYSTEMCombination MeterBE±38

Low Oil Pressure Warning
INSPECTION OF PRESSURE WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the pressure switch
and ground the connector on the wire harness side.
(b) Turn the ignition switch ON, check that t he warning
light lights.
If the warning light does not light, test the bulb.
2. INSPECT PRESSURE SWITCH OPERATION
(a) Disconnect the connector from the switch.
(b) Check that there is continuity between terminal and
ground with the engine stopped.
(c) Check that there is no continuity between terminal
and ground with the engine running.
HINT: Oil pressure should be over 0.3 kg/cm2 (4.3 psi, 29
kPa).
If operation is not as specified, replace the switch.If resistance value is not as specified, replace the send-
er gauge. 3. MEASURE SENDER GAUGE RESISTANCE
Measure the resistance between terminal and ground.
ater temperature oC
(OF)Resistance (
)
N i ppo nde nso Yazaki
± BODY ELECTRICAL SYSTEMCombination MeterBE±39

Brake Warning
INSPECTION OF BRAKE WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connectors from the level warning
switch and parking brake switch.
(b) Connect terminals on the wire harness side of the
level warning switch connector.
(e) Remove the CHARGE fuse and turn the ignition
switch
ON, check that the warning light lights.
If the warning light does not light, test the bulb.
2. INSPECT LEVEL WARNING SWITCH OPERATION
(a) Check that there is no continuity between terminals
with the switch OFF (float up).
(b) Check that there is continuity between terminals with
the switch ON (float down).
If operation is not as specified, replace the switch.
Open Door Warning
INSPECTION OF OPEN DOOR WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the door courtesy switch
and ground it.
(b) Turn the ignition switch ON, check that the warning light
lights.
If the warning light does not light, test the bulb.
2. INSPECT COURTESY SWITCH OPERATION
(a) Check that there is continuity between terminal and
switch body with the switch pin released.
(b) Check that there is no continuity between terminal and
switch body when the switch pin is pushed in.
If operation is not as specified, replace the switch. 3. INSPECT PARKING BRAKE SWITCH OPERATION
(a) Check that there is continuity between terminal and
switch set nut with the switch pin released.
(Parking brake lever pulled up)
(b) Check that there is no continuity between terminal
and switch set nut with the switch pin pushed in.
(Parking brake lever released)
If operation is not as specified, replace the switch.
± BODY ELECTRICAL SYSTEMCombination MeterBE±40

Seat Belt Warning
INSPECTION OF SEAT BELT WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the seat belt warning
relay and ground the terminal 5 on the wire harness
side.
(b) Turn the ignition switch ON, check that the warning
light lights.
If warning light does not light, test the bulb.
2. INSPECT BUCKLE SWITCH OPERATION
(a) Disconnect the connector from the switch.
(b) Check that there is no continuity between terminals
on the switch side connector with the belt fastened.
(c) Check that there is continuity between terminals on
the switch side connector with the belt unfastened.
If operation is not as specified, replace the seat belt inner.
3. INSPECT UNLOCK WARNING SWITCH OPERATION
(See page BE±1 3)
If operation is not as specified, replace the switch.
4. INSPECT SEAT BELT WARNING RELAY CIRCUIT
Disconnect the relay connector and inspect the connector
on the wire harness side as shown in the chart.
Unlock warning switch OFF (Ignition key removed)
If circuit is as specified, replace the relay.
Unlock warning switch ON (Ignition key set)
Buckle switch ON (Seat belt unfastened)Buckle switch OFF (Seat belt fastened)Courtesy switch ON (Door opened)
Turn ignition switch to OFF or ACCTurn ignition switch to OFF or ACC Courtesy switch OFF (Door closed)
Turn ignition switch ONTurn ignition switch ON
6 ± Ground
Tester
connectionSpecified value
Battery voltage
Battery voltage
Battery voltageBattery voltage
No continuity 1 ± Ground
2 ± Ground
3 ± Ground
5 ± Ground4 ± GroundContinuity
Continuity
ContinuityNo voltageNo voltageNo voltage
No voltage
Continuity Condition
Check for
VoltageVoltage
Always
± BODY ELECTRICAL SYSTEMCombination MeterBE±41

Rear Window Defogger Switch
INSPECTION OF SWITCH
INSPECT SWITCH OPERATION
(a) Connect the positive (+) lead from the battery to
terminal 2 and the negative (±) lead to terminal 3.
(b) Connect terminals 2 and 6 through a 3.4 W test bulb.
(e) Push the defogger switch. Check that the test bulb
lights for 12 to 18 minutes, then the test bulb goes
out.
If operation is not as specified, replace the switch.
Rear Window Defogger Relay
INSPECTION OF RELAY
1. INSPECT RELAY CONTINUITY
(a) Check that there is continuity between terminals 1
and 3.
(b) Check that there is no continuity between terminals 2
and 4.
(e) Check that there is no continuity between terminals 3
and 4.
If continuity is not as specified, replace the relay.
Reset breaker and check for short
Replace fuse and check for short
Check switch
Check relay
Check wires
Repair as necessary
REAR WINDOW DEFOGGER
Troubleshooting
Circuit breaker OFF
GAUGE fuse blown
Defogger switch faulty
Defogger relay faulty
Defogger wire broken
Wiring and ground faulty Rear window defogger
does not work.BE±3
BE±3
BE±42
BE±42
BE±43 Possible cause Problem
Remedy
Page
± BODY ELECTRICAL SYSTEMRear Window DefoggerBE±42

Rear Window Defogger Wires
CAUTION:
wWhen cleaning the glass, use a soft, dry cloth, and
wipe the glass in the direction of the wire. Take care
not to damage the wires.
wDo not use detergents or glass cleaners with abra-
sive ingredients.
wWhen measuring voltage, wind a piece of tin foil
around the top of the negative probe and press the
foil against the wire with your finger as shown.
INSPECTION OF DEFOGGER WIRES
1. INSPECT FOR WIRE BREAKAGE
(a) Turn the ignition switch to ON.
(b) Turn the defogger switch to ON.
HINT: If there are 10V, the wire is broken between the cen-
ter of the wire and positive (+) end. If there is no voltage,
the wire is broken between the center of the wire and
ground.
2. INSPECT FOR WIRE BREAKAGE POINT
(a) Place the voltmeter positive (+) lead against the de-
fogger positive (+) terminal.
(b) Place the voltmeter negative (±) lead with the foil strip
against the heat wire at the positive (+) terminal end
and slide it toward the negative (±) terminal end.
(c) The point where the voltmeter deflects from zero to
several volts is the place where the heat wire is bro-
ken.
HINT: If the heat wire is not broken, the voltmeter will ind
cafe 0V at the positive (+) end of the heat wire but gradua
ly increase to about 12V as the meter prove is moved to
the other end. 2. INSPECT RELAY OPERATION
(a) Apply battery voltage to terminals 1 and 3.
(b) Check that there is continuity between terminals 2
and 4.
(c) Check that there is no continu,ity between terminals
3 and 4.
If operation is not as specified, replace the relay.
(c) Inspect the voltage at the center of each heat wire as
shown.
Okay (No break in wire)
Approx. 1 OV or OVApprrox. 5V
Broken wire Voltage
Criteria
± BODY ELECTRICAL SYSTEMRear Window DefoggerBE±43

3. REPAIR DEFOGGER WIRES
(a) Thoroughly mix the repair agent (Dupont paste No.
4817).
(b) Using a fine tip brush, apply a small amount to the
wire.
(c) After a few minutes, remove the masking tape.
(d) Allow the repair to stand at least 24 hours.
REPAIR OF DEFOGGER WIRES
1. CLEAN BROKEN WIRE TIPS WITH WHITE GASOLINE
2. PLACE MASKING TAPE ALONG BOTH SIDES OF
WIRE TO BE REPAIRED
± BODY ELECTRICAL SYSTEMRear Window DefoggerBE±44