electrical TOYOTA CAMRY V20 1986 Service Information

Diagnosis System
DESCRIPTION
1. A self±diagnosis function is. built into the electrical control
system. Warning is indicated by the overdrive OFF indicator.
HINT: Warning and diagnostic codes can be read only when
the overdrive switch is ON. If OFF, the overdrive OFF
indicator is lit continuously and will not blink.
(a) If a malfunction occurs within the speed sensors or sole-
noids, the overdrive OFF light will blink to warn the driver.
However, there will be no warning of a malfunction with
lock±up solenoid.
W The diagnostic code can be read by the number of
blinks of the overdrive OFF indicator when terminals
Tt and E1 are short±circuited. (See page AT± 191)
(c) The throttle position sensor or brake signal are not indicated,
but inspection can be made by checking the voltage at ter-
minal Tt of the check connector.
(d) The signals to each gear can be checked by measuring the
voltage at terminal Tt of the check connector while driving.
2. The diagnostic (malfunction) code is retained in memory by the
ECU and due to back±up voltage, is not canceled out when the
engine is turned off. Consequently, after repair, it is necessary
to turn the ignition switch off and remove the fuse EFI (15A)
(A540E) or DOME (20A)
(A540H) or disconnect the Engine and ECT ECU (A540E)
or ECT ECU (A540H) connector to cancel out the diagnostic
(malfunction) code. (See page AT±192)
HINT:
wLow battery voltage will cause faulty operation of the diag-
nosis system. Therefore, always check the battery first.
wUse a voltmeter and ohmmeter that have an impedance of
at least 10 k
/V.
CHECK O/D OFF INDICATOR LIGHT
1. Turn the ignition switch ON.
2. The O/D OFF light will come on when the O/D switch
placed at OFF.
3. When the O/D switch is set to ON, the O/D OFF light should go
out.
If the O/D OFF light flashes when the O/D switch is set to
ON, the electronic control system is faulty.
± AUTOMATIC TRANSAXLETroubleshooting (Diagnosis System) (A540E and A540H)AT±190

AT4B'
HINT: If codes 62, 63, 64, 73 or 74 appear, there is an electrical malfunction in the solenoid.
Causes due t mechanical failure, such as a stuck valve, will not appear.
If codes 44 and 61 appear, check the both (vehicle and rear wheel) speed sensors.
AT2020
HINT: If codes 62, 63 or 64 appear, there is an electrical malfunction in the solenoid. Causes due
to mechanical failure, such as a stuck valve, will not appear.
Severed No. 2 center differential control solenoid valve or short circuit
± severed wire harness or short circuit. Defective rear wheel speed sensor (in transfer left case) ±
severed wire harness or short circuit
Defective vehicle speed sensor (in differential carrier cover)
severed wire harness or short circuit
Severed No. 1 center differential control solenoid valve or short
circuit ± severed wire harness or short circuit. Defective No. 1 speed sensor (in combination meter) ±
severed wire harness or short circuit
DIAGNOSTIC CODES.
(A540E)
Severed lock±up solenoid or short circuit ±
severed wire harness or short circuit Severed lock±up solenoid or short circuit ±
severed wire harness or short circuitDefective No. 2 speed sensor (in ATM) ±
severed wire harness or short circuit
Severed No. t solenoid or short circuit ±
severed wire harness or short circuit
Severed No. 2 solenoid or short circuit ±
severed wire harness or short circuit Severed No. 1 solenoid or short circuit ±
severed wire harness or short circuit
Severed No. 2 solenoid or short circuit ±
severed wire harness or short circuitDiagnosis System
Diagnosis System Light Pattern
Light Pattern
(A540H)
Code No.
Code
No.
Normal Normal
± AUTOMATIC TRANSAXLETroubleshooting (Diagnosis System) (A540E and A540H)AT±192

Manual Shifting Test
HINT: With this test, it can be determined whether the
trouble lies within the electrical circuit or is a mechani-
cal problem in the transaxle.
1. DISCONNECT SOLENOID WIRE
2. INSPECT MANUAL DRIVING OPERATION
Check that the shift and gear positions correspond
with the table below.
HINT: If the L, 2 and D range gear positions are diffi-
cult to distinguish, perform the following road test.
wWhile driving, shift through the L, 2 and D ranges,
Check that the gear change corresponds to the
shift position.
If any abnormality is found in the above test, the
problem lies in transaxle itself.
3. CONNECT SOLENOID WIRE
Shift position
Gear
positionP
range 2
range
range D
rangeR
range
Pawl
Lock Reverse O/D
O/D1 st
± AUTOMATIC TRANSAXLETroubleshooting (Manual Shifting Test) (A540E and
A540H)AT±202

3. REMOVE REAR VIEW MIRROR
(a) (Manual type)
Remove the setting screw and knob.
(b) Using a screwdriver, pry loose the retainer and re-
move the cover.
HINT: Tape the screwdriver tip before use.
(c) (Electrical type)
Disconnect the connector.
(d) Remove the three screws±and mirror.
(c) Insert a screwdriver between the retainers and door
trim to pry it loose.
HINT: Tape the screwdriver tip before use.
(d) (w/ Power Window and Power Door Lock)
Disconnect the connectors.
5. REMOVE SERVICE HOLE COVER
6. REMOVE OPENING CONTROL LINK FROM DOOR
LOCK
DISASSEMBLY OF FRONT DOOR
1. REMOVE REGULATOR HANDLE
(w/o POWER WINDOW)
Pull oft the snap ring with a cloth and remove the regulator
handle and plate.
2. REMOVE DOOR INSIDE HANDLE
(a) Remove the screw, and slide the handle forward.
(b) Disconnect the handle from the control link and re-
move the handle.
4. REMOVE DOOR TRIM
(a) Remove the two screws from the armrest.
(b) Remove the two caps and two screws.
± BODYFront DoorBO±5

(b) With the door glass fully closed, .adjust the door glass
stopper so it lightly makes contact with the glass
plate.
11. INSTALL OPENING CONTROL LINK
12. INSTALL SERVICE HOLE COVER
13. INSTALL DOOR TRIM8. INSTALL DOOR GLASS
(a) Place the glass in the door cavity.
(b) Install the glass to the regulator with the two mount-
ing nuts.
9. INSTALL DOOR GLASS RUN
14. INSTALL REAR VIEW MIRROR
(a) Install the mirror with the three screws.
(b) (Electrical type)
Connect the connector.
(c) Install the cover.
(d) (Manual type)
Install the knob with the setting screw.
15. INSTALL DOOR INSIDE HANDLE
(a) Connect the handle to the control link.
(b) Install the handle, slide it rearward, and install the
screw. 10. ADJUST DOOR GLASS
(a) Adjust the equalizer arm up or down and tighten it
where dimensions A and6, as shown, are equal.
± BODYFront DoorBO±9

BODY ELECTRICAL SYSTEM
± BODY ELECTRICAL SYSTEMBE±1

GENERAL INFORMATION
WIRING COLOR CODE
Wire colors are indicated by an alphabetical code.
B =Black L =Blue R =Red
BR=Brown LG=Light Green V =Violet
G =Green O =Orange W=White
GR=Gray P =Pink Y =Yellow
The first letter indicates the basic wire color and the sec±
ond letter indicates the color of the stripe.
CONNECTOR
1. PIN NUMBER OF FEMALE CONNECTOR
Numbered in order from upper left to lower right.
2. PIN NUMBER OF MALE CONNECTOR
Numbered in order from upper right to lower left.
3. DISTINCTION OF MALE AND FEMALE CONNECTORS
Male and female connectors are distinguished by shape
of their internal pins.
(a) All connectors are shown from the open end, and the
lock is on top.
(b) To pull apart the connectors, pull on the connector it-
self, not the wires.
HINT: Check the type of connector before disconnecting.
± BODY ELECTRICAL SYSTEMGeneral informationBE±2

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.
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 tec
nician.
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.(b) Using an ohmmeter, check that there is continuity be-
tween 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.
± BODY ELECTRICAL SYSTEMGeneral InformationBE±3

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 tech-
nician.
± BODY ELECTRICAL SYSTEMGeneral informationBE±4

If the circuit has diodes, reverse the two leads and check
again.
When contacting the negative (±) lead to the diode positive
(+)
side and the positive (+) lead to the negative (±) side, there
should be continuity.
When contacting 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 per-
forming the inspection.
Check LED (Light Emitting Diode) in the same manner as
that for diodes.
HINT:
wUse a tester with a power source of 3 V or greater to over-
come the circuit resistance.
wIf a suitable tester is not available, apply voltage and check
that the LED lights up.
CHECK FOR VOLTAGE
(a) Establish conditions in which voltage is present at
the check point.
Example:
(A) ± Ignition SW on
(B) ± Ignition SW and SW 1 on
(C) ± Ignition SW, SW 1, and Relay on (SW 2 off)
(b) Using a voltmeter, connect the negative (±) lead to
a good ground point or negative (±) battery terminal
and the positive (+) lead to the connector or compo-
nent terminal. This check can be done with a test
bulb instead of a voltmeter.
CHECK FOR CONTINUITY AND
RESISTANCE
(a) Disconnect the battery terminal or wire so there is
no voltage between the check points.
(b) Contact the two leads of an ohmmeter to each of
the check points.
± BODY ELECTRICAL SYSTEMGeneral InformationBE±5