sensor TOYOTA CAMRY V20 1986 Service Information

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

TROUBLESHOOTING FLOW±CHART
HINT:
wIf diagnostic code Nos. 42, 61, 62 or 63 are output, the overdrive OFF indicator light will begin to
blink immediately to warn the driver. However, an impact or shock may cause the blinking to stop;
but the code will still be retained in the ECT ECU memory until canceled out.
wThere is no warning for diagnostic code No. 64.
wIn the event of a simultaneous malfunction of both No. 1 and No. 2 speed sensors, no diagnostic
code will appear and the fail±safe system will not function. However, when driving in the D range,
the transaxle will not up±shift from first gear, regardless of the vehicle speed.
1. Diagnostic code 42 (No. 1 speed sensor circuitry)
Check continuity between ECT ECU
connector SP, terminal and body ground.
(See page AT±32)
Check continuity between ECT ECU
connector SP2 terminal and body ground.
(See page AT±33)
Check wiring between ECT ECU and No. 2
speed sensor.Check wiring between ECT ECU and
combination meter.
2. Diagnostic code 61 (No. 2 speed sensor circuitry
Repair or replace No. 1 speed
sensor.
Check No. 2 speed sensor.
(See page AT±35)Repair or replace No. 2
speed sensor. Substitute another ECT ECU.
Substitute another ECT ECU.Check No. 1 speed sensor.
± AUTOMATIC TRANSAXLETroubleshooting (Diagnosis System) (A140E)AT±19

3. INSPECT EACH UP±SHIFT POSITION
(a) Warm up the engine.
Coolant temperature: 176
°F (80°C)
(b) Turn the O/D switch to ºONº.
(c) Place the pattern select switch in ºNormalº and the shift
lever into the D range.
(d) During a road test (above 10 km/h or 6 mph) check that
voltage at the ECT terminal is as indicated below for
each up±shift position.
If the voltage rises from 0V to 7V in the sequence
shown, the control system is okay.
The chart on the left shows the voltmeter reading and
corresponding gears. .
HINT: Determine the gear position by a light shock or
change in engine rpm when shifting. The lock±up clutch
will turn ON only infrequently during normal 2nd and 3rd
gear operation. To trigger this action, press the acceler-
ator pedal to 50% or more of its stroke. At less than
50%, the voltage may change in the sequence 2V ± 4V
± 6V ± 7V. 2. INSPECT BRAKE SIGNAL
(a) Depress the accelerator pedal until the ECT terminal
indicates 8V.
(b) Depress the brake pedal and check the voltage read-
ing from the ECT terminal.
(c) Brake pedal depressed . . . . . . . . . . 0V
Brake pedal released . . . . . . . . . . . . 8V
If not as indicated, there is a malfunction in either the
stop light switch or circuit.
INSPECTION OF Tt TERMINAL VOLTAGE
1. INSPECT THROTTLE POSITION SENSOR SIGNAL
(a) Turn the ignition switch to ON. Do not start the engine.
(b) Connect a voltmeter to terminals Tt and E1.
(c) While slowly depressing the accelerator pedal,
check that ECT terminal voltage rises in sequence.
if the voltage does not change in proportion to the
throttle opening angle, there is a malfunction in the
throttle position sensor or circuit.
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±31

7. INSPECT NO. 1 SPEED SENSOR IN COMBINATION
METER
(a) Remove the combination meter.
(b) Connect an ohmmeter between the terminals.
(c) Revolve the meter shaft and check that the meter
needle repeatedly deflects from 0 to 8

. 6. INSPECT NO. 2 SPEED SENSOR IN ATM
(a) Jack up a front wheel on one side.
(b) Connect an ohmmeter between the terminals.
(c) Spin the wheel and check that the meter needle de-
flects from 0 to 8 W. 5. INSPECT THROTTLE POSITION SENSOR
Using an ohmmeter, check the resistance between
each terminal. 4. INSPECT NEUTRAL START SWITCH
Inspect that there is continuity between terminal LL±C, 2L±
C and NL±C.
Throttle valve
conditionresistance (W) Shift
Position
TerminalTerminal
N range
2 range
L range
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±34

Speedometer Driven Gear
REPLACEMENT OF SPEEDOMETER DRIVEN
GEAR OIL SEAL
1. REMOVE SPEEDOMETER DRIVEN GEAR OIL SEAL
Using SST, pull out the oil seal.
SST 09921±00010
ON±VEHICLE REPAIR
HINT: The components mentioned below can be replaced on the vehicle as they are without any
necessity removal of the transmission. For the respective operating procedures refer to the follow-
ing pages:
2. INSTALL SPEEDOMETER DRIVEN GEAR OIL SEAL
SST 09201±60011
Drive in depth: 19 mm (0.75 in.)
After installing governor bracket,
install transaxle protector an
d LH drive shaft. Using SST, remove the drain plug
and drain the fluid before
removing oil pan.
Before removing governor
bracket, remove transaxle
protector and± LH drive shaft.After installing oil pan, fill
transmission with ATF.
(See page AT±21)
Speedometer Driven
Gear Governor Valve
(A140L)AT±1 7 7
to
AT±180
Speed Sensor (A140E)
AT±1 80
and
AT±181 AT±51 and
AT±52 AT±61 to
AT±63
Throttle CableComponents
Valve BodyInstallation
See page See pageRemoval
Remarks Remarks
AT±50 AT±61AT±51
AT±50AT±52
AT±53
± AUTOMATIC TRANSAXLEOn±Vehicle Repair (A140L and A140E)AT±50

6. INSTALL NEUTRAL START SWITCH
(a) Install the neutral start switch.
(b) Install the manual shift lever.
(c) Adjust the neutral start switch.
(See page AT±22)
(d) Connect the transmission control cable. 4. CONNECT THROTTLE CABLE
(a)Connect the cable to the throttle linkage.
(b) Connect the cable housing to the bracket.
5. ADJUST THROTTLE CABLE (See page AT±22) (b) Pull the inner cable lightly until a slight resistance
is felt, and hold it.
(c) Stake the stopper 0.8 ± 1.5 mm (0.031 ± 0.059 in.)
from the surface of outer cable as shown.
No. 2 Speed Sensor (A140E)
REMOVAL OF SPEED SENSOR
1. REMOVE TRANSAXLE CASE PROTECTOR
2. DISCONNECT SPEED SENSOR CONNECTOR
3. REMOVE BRACKET
4. REMOVE SPEED SENSOR AND O±RING
± AUTOMATIC TRANSAXLEOn±Vehicle Repair (A140L and A140E)AT±52

INSPECTION OF SPEED SENSOR
INSPECT SPEED SENSOR
Connect an ohmmeter to the speed sensor and check
that the meter deflects when the sensor is repeatedly
brought close to a magnet and removed from it.
INSTALLATION OF SPEED SENSOR
7. INSTALL SPEED SENSOR AND O±RING
2. INSTALL BRACKET
Torque: 130 kg±cm (9 ft±Ib. 13 N±m)
3. CONNECT SPEED SENSOR CONNECTOR
4. INSTALL TRANSAXLE CASE PROTECTOR
± AUTOMATIC TRANSAXLEOn±Vehicle Repair (A140E)AT±53

2. REMOVE NEUTRAL START SWITCH
(a) Remove the manual shift lever.
(b) Pry off the lock washer and remove the manual valve
shaft nut.
(c) Remove the two bolts and pull out the neutral start
switch.
SEPARATE BASIC SUBASSEMBLY
1. REMOVE UNION AND ELBOW
(a) Using the open end wrench, remove the union and
elbow.
(b) Remove the O±rings from the union and elbow.
6. (A140E)
REMOVE NO. 2 SPEED SENSOR
(a) Disconnect the speed sensor connector.
(b) Remove the two bolts and cover bracket. 3. REMOVE SOLENOID
(a) Disconnect connector.
(b) Remove the two bolts and solenoid.
4. REMOVE THROTTLE CABLE RETAINING PLATE
5. REMOVE SOLENOID WIRE RETAINING BOLT
± AUTOMATIC TRANSAXLERemoval of Component Parts (A140L and A140E)AT±60

8. REMOVE OIL PAN AND GASKET
(a) Remove the fifteen bolts.
(b) Remove the oil pan by lifting transmission case.
NOTICE: Do not turn the transmission over as this will con-
taminate the valve body with the foreign materials in the
bottom of the oil pan.
(c) Place the transmission on wooden blocks to prevent
damage to the tube bracket.
9. EXAMINE PARTICLES IN PAN
Remove the magnets and use them to collect any steel
chips. Look carefully at the chips and particles in the oil
pan and on the magnets to anticipate what type of wear
you will find in the transmission:
Steel (magnetic) ...bearing, gear and plate wear
Brass (non±magnetic) ...bushing wear (b) Remove the governor cover.
(c) Remove the governor body and thrust washer.
(d) Remove the plate washer and governor body
adaptor. 7. (A 140 L)
REMOVE GOVERNOR BODY
(a) Remove the two bolts and cover bracket.(c) Remove the speed sensor.
± AUTOMATIC TRANSAXLERemoval of Component Parts (A140L and A140E)AT±61