electrical TOYOTA CAMRY V20 1986 Service Information

IN0036
Seal Lock Adhesive
GENERAL REPAIR INSTRUCTIONS
1. Use fender, seat and floor covers to keep the vehicle
clean and prevent damage.
2. During disassembly, keep parts in order to facilitate
reassembly.
3. Observe the following:
(a) Before performing electrical work, disconnect the
negative cable four the battery terminal.
(b) If it is necessary to disconnect the battery for in-
spection or repair, always disconnect the cable from
the negative (-) 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 it or prying it.
(d) Clean the battery terminal posts and cable termi-
nals with a shop rag. Do not scrape them with a file
or other abrasive object.
(e) Install the cable terminal to the battery post with the
nut loose, and tighten the nut after installation. Do
not use a hammer or such to tap the terminal onto
the post.
(f) Be sure the cover for the positive (+) terminals are
properly in place.
4. Check hoses and wiring connectors to make sure
that they are secure and correct.
5. Non-reusable parts
(a) Always replace cotter pins, gaskets, O-rings and oil
seals etc. with new ones.
(b) Non-reusable parts are indicated in the component
illustrations by the ºrº symbol.
6. Precoated parts
Precoated parts are the bolts and nuts, which have
been 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 installation part threads.
(2) Dry with compressed air.
(3) Apply the specified seal lock adhesive to the
bolt or nut threads.
(c) Precoated parts are indicated in the component il-
lustrations by the º
º symbol.
IN-4- INTRODUCTIONGeneral Repair Instructions

Ignition Switch ºONº
Blower Switch º'ONº " Heater Relay ªONº (Blower Motor ºRUNº)
A/C Switch ºONº " A/C Amplifier º'ONº (A/C Amp. Main Power Supply) 1. PRINCIPLE OF A/C ELECTRICAL CIRCUIT
2. HOW IS MAGNETIC CLUTCH ENERGIZED?
The general process until the magnetic clutch is energized is shown below.
Dual Pressure Switch º'ONº:
Refrigerant Condition (2.1 kg/cm2 (30 psi, 206 kPa) less than 27 kg/cm
2 (384 psi, 2,648 kPa))
Thermistor supplies temperature signal of evaporator to A/C amplifier.
VSV ºONº " E/G Idle±Up
Magnetic Clutch Relay º'ONº
Temperature Sensor ºONº:
Temperature of Temperature Sensor is less than 180
°C (356°F).
Magnetic Clutch ºONº
Revolution Detecting Sensor supplies RPM signal of compressor to A/C amplifier.
If compressor is not locked, magnetic clutch is continuously energized.
± AIR CONDITIONING SYSTEMGeneral DescriptionAC±14

To evacuate and charge system
To perform electrical diagnosis
To perform electrical diagnosis
To perform electrical diagnosis
To remove and install pressure plate
To remove pressure plate
To remove and install rotor and stator Air conditioner service tool set
Ohmmeter
Voltage meter
Ammeter
Magnetic clutch stopper
Magnetic clutch remover
Snap ring pliers (External type)
SPECIAL TOOLS AND EQUIPMENT
SSM (SPECIAL SERVICE MATERIALS)
07110±58011
07112±76060
07112±66040
07114±84020
DENSOOIL 6,
SUNlSO No. 5GS or equivalent07117±68040
Compressor
Part NameSST No.
Part No.
Use etc. Tool
Use
± AIR CONDITIONING SYSTEMSpecial Tools and EquipmentAC±15

To evacuate and charge system
To perform electrical diagnosis
To perform electrical diagnosis
To perform electrical diagnosis
To remove and install pressure plate
To remove pressure plate
To remove and install rotor and stator Air conditioner service tool set
Ohmmeter
Voltage meter
Ammeter
Magnetic clutch stopper
Magnetic clutch remover
Snap ring pliers (External type)
SPECIAL TOOLS AND
EQUIPMENT
SSM (SPECIAL SERVICE MATERIALS)
07110±58011
07112±76060
07112±66040
07114±84020
DENSOOIL 6,
SUNlSO No. 5GS or equivalent07117±68040
Compressor
Part NameSST No.
Part No.
Use etc. Tool
Use
± AIR CONDITIONING SYSTEMSST (Special Service Materials)AC±15

TROUBLESHOOTING
Basic Troubleshooting
Before troubleshooting an ECT, first determine whether the problem is electrical or mechanical.
To do this, just refer to the basic troubleshooting flow±chart provided below.
If the cause is already known, using the basic troubleshooting chart below along with the general
troubleshooting chart on the following pages should speed the procedure.
Stall Test, Time Lag Test and
Hydraulic Test Read Diagnostic Code
(See page AT±17)
Manual Shifting Test
(See page AT±23)
Electrical Control System CheckPreliminary Check
(See page AT±21 )Repair or
Replace
Repair or ReplaceRepair Transaxle Bad
BadBad
Bad
Bad
± AUTOMATIC TRANSAXLETroubleshooting (Basic Troubleshooting) (A140L and
A140E)AT±11

A140E Automatic Transaxle (ECT)
WHAT IS THE ECT?
ECT means Electronic Controlled Transaxle. The hydraulic control system of the previous automatic
transaxle has been changed, the throttle and governor pressure have been replaced by electronic
signals and a micro computer has been used to give precise control of shift timing and lock±up tim-
ing.
FEATURES OF THE ECT
(a) The shift pattern can be chosen.
In the ECT ECU micro computer used in the A140E, two types of shift pattern, Power and Normal,
are recorded in the memory. By operating the pattern select switch, the driver can select the pre-
ferred shift pattern.
(b) Reduced fuel consumption and reduced shock during shifting is made possible.
Precise control of the shift timing by the ECT ECU, operation of the lock±up clutch from low speeds,
and decreased fuel consumption are made possible. Also, shock during Shifting is reduced.
(e) Self±Diagnostic System
When a malfunction occurs in the electronic control system, the driver is informed of this fact. Also,
there is a Self±Diagnostic System which displays the location of the malfunction when the service
connector is shorted.
(d) Fail±Safe System
A fail±Safe System is included so that, even if a malfunction occurs in the electronic control system,
the vehicle will be able to operate.
CONSTRUCTION AND OPERATION
When the A140E (ECT) is compared with the A140L, the automatic transaxle body has the same
construction and operation, with the exception of the hydraulic control system, as the A140L.
The electronic control system, which controls the shift timing and lock±up timing, has been added.
1. Hydraulic Control System (Comparison with the A140L)
VALVE BODY ± Additions or changes to solenoid valve
In the A140E there are three solenoid valves, the No. 1, the No. 2 and the lock±up solenoid valves.
Shifting occurs according to whether the No. 1 and No. 2 solenoid valves are ON or OFF, and the
lock±up solenoid valve controls the lock±up clutch.
GOVERNOR VALVE ± Removed
With the A140E, the governor valve has been replaced with a speed sensor, so that instead of the
governor pressure, a speed sensor signal is sent to the ECT ECU.
SHIFT CONTROL IN ECT
1. The vehicle speed is sensed by the vehicle speed
sensor, which sends this data to the
ECU in the form of electrical signals.
2. The angle to which the throttle is open is sensed
by the throttle position sensor, which sends this
data to the ECU in the form of electrical signals.
3. The ECT computer determines the shift point on
the basis of these two signals and operates the
solenoid valves in the hydraulic control unit, thus
shifting the transmission.
± AUTOMATIC TRANSAXLEDescription (A140L and A140E)AT±9

Diagnosis System (A140E)
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 (No.
1 or 2) or solenoids (No. 1 or 2), the overdrive OFF
light will blink to. warn the driver. .
However, there will be no warning of a malfunction with
lock±up solenoid.
(b) 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±17)
tc) The throttle position sensor or brake signal are not indi-
cated, but inspection can be made by checking the voltage at
terminal Tt of the check connector (diagnosis).
(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
CPU 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) or
disconnect the ECT computer connector to cancel out the diag-
nostic (malfunction)
code. (See page AT±18)
HINT:
wLow battery voltage will cause faulty operation of the diag-
nosis system. Therefore, always check the battery first.
w Use a voltmeter and ohmmeter that have an impedance
of at least 10 k 11 IV.
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 is
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) (A140E)AT±16

CANCEL OUT DIAGNOSTIC CODE
1. After repair of the trouble area, the diagnostic code
retained in memory by the ECT ECU must be canceled by
removing the fuse EFI (15A) for 10 seconds or more, de-
pending on ambient temperature (the lower the tempera-
ture, the longer the fuse must be left out) with the ignition
switch OFF.
HINT:
wCancellation can be also done by removing the battery
negative (±) terminal, but in this case other memory sys-
tems (TCCS diagnosis memory, etc.) will be also can-
celed out.
wThe diagnostic code can be also canceled out by discon-
necting the ECT ECU connector.
wIf the diagnostic code is not canceled out, it will be
retained by the ECT ECU and appear along with a new
code in event of future trouble.
2. After cancellation, perform a road test to confirm that a
ºnormal codeº is now read on the O/D OFF indicator. 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.
Defective No. 1 speed sensor (in combination meter) ±
severed wire harness or short circuit
Severed lock±up solenoid or short circuit ±
severed wire harness or short circuit Defective No. 2 speed sensor (in ATM) ±
severed wire harness or short circuit
Severed No. 2 solenoid or short circuit ±
severed wire harness or short circuitSevered No. 1 solenoid or short circuit ±
severed wire harness or short circuit
DIAGNOSTIC CODES
Diagnosis System
Light Pattern Code No.
Normal
± AUTOMATIC TRANSAXLETroubleshooting (Diagnosis System) (A140E)AT±18

Manual Shifting Test (A140E)
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 ECT ECU CONNECTOR
(a) Remove the glove box.
(b) With the engine OFF, disconnect the ECT connector.
HINT: If the L, 2 and D range gear positions are difficult
to distinguish, perform the following road test.
wWhite driving, shift through the L, 2 and D ranges.
Check that the gear change corresponds to the shift
position.
3. CONNECT ECT ECU CONNECTOR2. INSPECT MANUAL DRIVING OPERATION
Check that the shift and gear positions correspond with
the table below.
Gear position
Shift positionP
' range R
range 2
range V
rangeL
range
Pawl
Lock Reverse
O/D 1st
3rd
± AUTOMATIC TRANSAXLETroubleshooting (Manual Shifting Test) (A140E)AT±23

TROUBLESHOOTING (A540E, A540H)
Basic Troubleshooting
Before troubleshooting an ECT, first determine whether the problem is electrical or mechanical.
To do this, just refer to the basic troubleshooting flow±chart provided below.
If the cause is already known, using the basic troubleshooting chart below along with the general
troubleshooting chart on the following pages should speed the procedure.
Stall Test, Time Lag Test and
Hydraulic Test Electrical Control System CheckRead Diagnostic Code
(See page AT± 191)
Manual Shifting Test
(See page AT±202) Preliminary Check
(See page AT±199)
Repair Transaxle
Repair or ReplaceRepair
or
Replace
OK
OKBadBad Bad
Bad
Bad
± AUTOMATIC TRANSAXLETroubleshooting (Basic Troubleshooting) (A540E and A540H)AT±186