electrical TOYOTA CAMRY V20 1986 Service Information

PRECAUTIONS
1. Before working the fuel system, disconnect the cable
from negative (±) terminal of the battery.
HINT: Any diagnostic code retained by the computer will be erased
when the battery terminal is removed. Therefore, if necessary, read
the diagnosis before removing the battery terminal.
2. Do not smoke or work open flame when working the fuel system.
3. Keep gasoline off rubber or leather parts.
INSPECTION PRECAUTIONS
MAINTENANCE PRECAUTIONS
1. CHECK CORRECT ENGINE TUNE±UP
(See page EM±8)
2. PRECAUTIONS WHEN CONNECTING GAUGE
(a) Use the battery as the power source for the timing light, tachome-
ter, etc.
(b) (3S±FE)
Connect the test probe of a tachometer to the service
connector of the distributor.
(c) (2VZ±FE)
Connect the test probe of a tachometer to the terminal
IG ± of the check connector.
3. IN EVENT OF ENGINE MISFIRE FOLLOWING
PRECAUTIONS SHOULD BE TAKEN
(a) Check proper connection of battery terminals, etc.
(b) Handle high±tension cords carefully.
(c) After repair work, check that the ignition coil terminals and
all other ignition system lines are reconnected securely.
(d) When cleaning the engine compartment, be especially
careful to protect the electrical system from water.
4. PRECAUTIONS WHEN HANDLING OXYGEN
SENSOR(S)
(a) Do not allow the oxygen sensor to drop or hit against an ob-
ject.
(b) Do not allow the sensor to come into contact with water.
± EFI SYSTEMInspection PrecautionsFI±5

TROUBLESHOOTING PROCEDURES
SYMPTOM±DIFFICULT START OR NO START
(ENGINE WILL NOT CRANK OR CRANKS
SLOWLY)
4. Use a volt/ohmmeter with high impedance (10 k
N
minimum) for troubleshooting of the electrical circuit.
(See page FI±31)
1. Oil filler cap
2. Oil dipstick
3. Hose connections
4. PCV hoses
5. EGR system EGR valve stays open1. Battery
(1) Connection
(2) Gravity Drive belt Charging system
(3) Voltage
1. Ignition switch
2. Neutral start switch (A/T)
3. Clutch start switch (M/T)
4. Starter relay (M/T)
5. Starter
6. Wiring/Connection
SYMPTOM±DIFFICULT TO START OR NO START (CRANKS OK)
CHECK DIAGNOSIS SYSTEM
Check for output of diagnosis code.
(See page FI±22)
1. High±tension cords
2. Distributor
3. Ignition coil
4. Igniter
DOES ENGINE START WITH
ACCELERATOR PEDAL DEPRESSED?
CHECK FOR VACUUM LEAKS IN AIR
INTAKE LINEISC system
(1) ISC valve
(2) Wiring connection
CHECK IGNITION SPARK
(See page IG±5 or 9)
Diagnostic code(s) (See page FI±25 or 27)
OK CONTINUED ON PAGE FI±12 CHECK STARTING SYSTEMCHECK ELECTRIC SOURCE
Malfunction
code(s)
Normal codeBAD BAD
BAD
BAD
± EFI SYSTEMTroubleshootingFI±11

Tab width
0.64 mm
INTRODUCTION±GENERAL INFORMATION
A±1
2
Wire Harness Repair Manual (RM1022E)
GENERAL INFORMATION
This manual provides instruction in the following repairs:

How to Inspect for System Inspection

Circuit Protection

Terminal and Connector Repair Procedure
NOTICE:
When inspecting or repairing the SRS AIRBAG, be sure to carefully read the precautionary
instructions and procedure in the Repair Manual for the applicable model.
After any electrical repair is made, always test the circuit by operating the devices in the circuit. This
confirms not only that the repair is correct, but also that the cause of the complaint was correctly
identified.
Terminal type number name
The terminal type number naming system has changed:
the metric system will be used in place of the inch system.
To be more specific, male tab width ºin millimetersº will be
used as terminal type number from now on ±± in place of
male tab width in inches which has been in use so far.
Below is a table of comparison:
Old terminal type No.
(inch)
New terminal type No.
(mm)
025"0.64
040 (II, III, IV)"1.0 (II, III, IV)
050"1.3
070 (II)"1.8 (II)
090 (II)"2.3 (II)
187"4.8
250 (II)"6.3 (II)
305"7.7
312"8.0
375"9.5
For those connectors which are not shown above, the
terminal type numbers remain unchanged.
A

Terminal (Female)
Housing (Female)
Housing (Male)
Terminal (Male)
Wire
Harness
(W/H)Electric Wire
Terminal
Housing
Fuse
Other J/B
(Junction Block)
R/B
(Relay Block)
Insulator
Copper Wires
(Conductor)
B = Black W = White
L = Blue BR = Brown
V = Violet SB = Sky Blue
R = Red G = Green
P = Pink LG = Light Green
Y = Yellow GR = Gray
O = Orange
A±2
INTRODUCTION±GENERAL INFORMATION
3
Wire Harness Repair Manual (RM1022E)
What is Wire Harness?
The wire harness (W/H) is systems of electric wires for
automobiles to connect all the electronics parts in
automobile electrically and work them. As more electronics
parts are introduced in automobiles recently, the electric
wires used for the wire harness are increasing in number
and the structure is becoming more complicated. As a
result of that, there are hundreds of connectors, which is
the parts which connects wires mechanically and
electrically, in one vehicle. Therefore, numbers of the
connector terminal (Terminal) or the connector housing
(Housing) are designed to meet many kinds of uses of
circuits. Various components have been improved to
ensure the product reliability or realize a wider space in the
vehicles.
Wire Harness Components
Wire harness mainly consists of wires, terminals, or
housings.
There are various components are designed for many
parts of vehicles, such as one with high heat±resistance,
water±resistance, or bending ability, ones have different
current capacities, or ones are hardly influenced by
electromagnetic noise.
Electric Wire
The electric wires used for the wire harness consists of the
conductor made from numbers of twisted mild copper wire
with a diameter of less than 0.5 mm and the insulator
surrounding the conductor.
The insulator is generally made from vinyl chloride and
covers the conductor with even thickness. The insulators
are color±coded in order to distinguish each wire. The base
colors or the stripe patterns is used to make difference
between insulators. Each color of wires is indicated by the
abbreviation in the repair manual and the electrical wiring
diagram.
A

Diode Ohmmeter
Diode Ohmmeter
Digital Type Analog Type
Bulb Ohmmeter
A±6
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
7
Wire Harness Repair Manual (RM1022E)
If the circuit has diodes, reverse the two leads and check
again.
When touching the negative (±) lead to the diode positive
(+) side and the positive (+) lead to the negative (±) side,
there should be continuity. When touching the two leads in
reverse, there should be no continuity.
HINT: Specifications may vary depending on the type of
tester, so refer to the tester's instruction manual before
performing the inspection.
Check LED (Light Emitting Diode) in the same manner as
that for diodes.
HINT:

Use a tester with a power source of 3V or greater to
overcome the circuit resistance.

If a suitable tester is not available, apply battery
voltage and check that the LED lights up.
(c)Use a volt/ohmmeter with high impedance (10kW/V
minimum) for troubleshooting of the electrical circuit.
3. Bulb Check
(a)Remove the bulb.
(b)There should be continuity between the respective
terminals of the bulb together with a certain amount
of resistance.
(c)Apply the two leads of the ohmmeter to each of the
terminals.
(d)Apply battery voltage and check that the bulb light up.
A

Push
Equal Amperage Rating
A±8
INTRODUCTION±CIRCUIT PROTECTION
9
Wire Harness Repair Manual (RM1022E)
CIRCUIT PROTECTION
All electrical circuits are protected against excessive loads which might occur because of shorts or
overloads in the wiring system. Such protection is provided by a fuse, circuit breaker, or fusible link, A
short circuit may cause a fuse to blow or a circuit breaker to open.
RESET CIRCUIT BREAKER
1. Remove Circuit Breaker
(a)Disconnect the negative (±) cable from the battery.
(b)Remove the circuit breaker.
2. Reset Circuit Breaker
(a)Insert the needle into the reset hole and push it.
(b)Using an ohmmeter, check that there is continuity
between both terminals of the circuit breaker.
If continuity is not as specified, replace the circuit breaker.
HINT: If replacing the circuit breaker, be sure to replace
it with a breaker with an equal amperage rating.
3. Install Circuit Breaker
(a)Install the circuit breaker.
(b)Connect the negative (±) cable to the battery.
HINT: If a circuit breaker continues to cut out, a short
circuit is indicated. Have the system checked by a qualified
technician.
A

Equal Amperage Rating
Equal Amperage Rating
Puller
INTRODUCTION±CIRCUIT PROTECTION
A±9
10
Wire Harness Repair Manual (RM1022E)
REPLACEMENT OF FUSE AND FUSIBLE LINK
HINT: If replacing the fuse or fusible link, be sure to
replace it with a fuse or fusible link with an equal amperage
rating.
NOTICE:
1.Turn off all electrical components and the ignition
switch before replacing a fuse or fusible link. Do
not exceed the fuse or fusible link amperage rating.
2.Always use a fuse puller for removing and
inserting a fuse. Remove and insert straight in and
out without twisting. Twisting could force open the
terminals too much, resulting in a bad connection.
If a fuse or fusible link continues to blow, a short circuit is
indicated. The system must be checked by a qualified
technician.
HINT: The puller is located at Junction Block No.2.
A

GENERAL REPAIR INSTRUCTIONS
1. Use fender seat and floor covers to keep the vehicle clean
and prevent damage.
2. During disassembly, keep parts in the appropriate order to
facilitate reassembly.
3. Observe the following:
(a) Before performing electrical work, disconnect the neg-
ative cable from the battery terminal.
(b) If it is necessary to disconnect the battery for inspection
or repair, always disconnect the cable from the nega-
tive H terminal which is grounded to the vehicle body.
(c) To prevent damage to the battery terminal post, loosen
the terminal nut and raise the cable straight up
without twisting or prying it.
(d) Clean the battery terminal posts and cable terminals
with a shop rag.
o not scrape them with a file or other
abrasive objects.
(e) Install the cable terminal to the battery post with
the nut loose, and tighten the nut after installation. Do
not use a hammer to tap the terminal onto the post.
(f) Be sure the cover for the positive (+) terminal is properly
in place.
4. Check hose and wiring connectors to make sure that they are
secure and correct.
5. Non±reusable parts
(a) Always replace cotter pins, gaskets, 0±rings and oil
seals etc. with new ones.
(b) Non±reusable parts are indicated in the component il-
lustrations by the ºrº symbol.
IDENTIFICATION INFORMATION
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number is stamped on the cowl
panel.
This number has also been stamped on the vehicle identifi-
cation number plate and certification regulation label.
A. Vehicle Identification Number
B. Vehicle Identification Number Plate
C. Certification Regulation Label
ENGINE SERIAL NUMBER
The engine serial number is stamped on the engine block as
shown.
± INTRODUCTIONIdentification InformationIN±4

GENERAL REPAIR INSTRUCTIONS
1. Use fender seat and floor covers to keep the vehicle clean
and prevent damage.
2. During disassembly, keep parts in the appropriate order to
facilitate reassembly.
3. Observe the following:
(a) Before performing electrical work, disconnect the neg-
ative cable from the battery terminal.
(b) If it is necessary to disconnect the battery for inspection
or repair, always disconnect the cable from the nega-
tive H terminal which is grounded to the vehicle body.
(c) To prevent damage to the battery terminal post, loosen
the terminal nut and raise the cable straight up
without twisting or prying it.
(d) Clean the battery terminal posts and cable terminals
with a shop rag.
o not scrape them with a file or other
abrasive objects.
(e) Install the cable terminal to the battery post with
the nut loose, and tighten the nut after installation. Do
not use a hammer to tap the terminal onto the post.
(f) Be sure the cover for the positive (+) terminal is properly
in place.
4. Check hose and wiring connectors to make sure that they are
secure and correct.
5. Non±reusable parts
(a) Always replace cotter pins, gaskets, 0±rings and oil
seals etc. with new ones.
(b) Non±reusable parts are indicated in the component il-
lustrations by the ºrº symbol.
IDENTIFICATION INFORMATION
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number is stamped on the cowl
panel.
This number has also been stamped on the vehicle identifi-
cation number plate and certification regulation label.
A. Vehicle Identification Number
B. Vehicle Identification Number Plate
C. Certification Regulation Label
ENGINE SERIAL NUMBER
The engine serial number is stamped on the engine block as
shown.
± INTRODUCTIONGeneral Repair InstructionsIN±4

6. Precoated parts
Precoated parts are bolts and nuts, etc. that are coated with a
seal lock adhesive at the factory.
(a) If a precoated part is retightened, loosened or caused to
move in any way, it must be recoated with the specified
adhesive.
(b) Recoating of precoated parts
(1) Clean off the old adhesive from the bolt, nut or threads.
(2) Dry with compressed air.
(3) Apply the specified sea! lock adhesive to the bolt or nut
threads.
(e) Precoated parts are indicated in the. component illustra-
tions by the ºrº symbol.
7. When necessary, use a sealer on gaskets to prevent leaks.
8. Carefully observe all specifications for bolt tightening torques. Al-
ways use a torque wrench.
9. Use of special service tools (SST) and special service materials
(SSM) may be required, depending on the nature of the repair.
Be sure to use SST and SSM where specified and follow the
proper work procedure. A list of SST and
SSM can be found at the back of this manual.
10. When replacing fuses, be sure the new fuse has the correct am-
perage rating. DO NOT exceed the rating or use one with a low-
er rating.
11. Care must be taken when jacking up and supporting the vehicle.
Be sure to lift and support the vehicle at the proper locations.
(See page IN±27)
(a) If the vehicle is to be jacked up only at the front or rear end,
be sure to block the wheels at the apposite end in order
to ensure safety.
(b) After the vehicle is jacked up, be sure to support it on stands.
It is extremely dangerous to do any work on a vehicle
raised on a jack alone, even for a small job that can be fin-
ished quickly.
12. Observe the following precautions 'to avoid damage to the parts:
(a) Do not open the cover or case of the ECU unless abso-
lutely necessary. (If the IC terminals are touched, the
IC may be destroyed by static electricity.)
(b) When replacing the internal mechanism (computer
part) of the digital meter, be careful that no
part of your body or clothing comes in contact with the
terminals of the leads from the IC, etc. of the replace-
ment part (spare part).
(c) To disconnect vacuum hoses, pull on the end, not the middle
of the hose.
M To pull apart electrical connectors, pull on the connector
itself, not the wires.
(e) Be careful not to drop electrical components, such as sen-
sors or relays. If they are dropped on a hard floor, they
should be replaced and not reused.
± INTRODUCTIONGeneral Repair InstructionsIN±5