1986 TOYOTA CAMRY V20 light

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

5. INSPECT AND ADJUST SHIFT CABLE
When shifting the shift lever from the N position to oth-
er positions, check that the lever can be shifted
smoothly and accurately to each position and that the
position indicator correctly indicates the position.
If the indicator is not aligned with the correct position,
carry out the following adjustment procedures.
(a) Loosen the swivel nut on manual shift lever.
(b) Push the manual lever fully toward the right side of the
vehicle.
(c) Return the lever two notches to NEUTRAL position.
(d) Set the shift lever to N.
(e) While holding the lever lightly toward the R range
side, tighten the swivel nut.
6. ADJUST NEUTRAL START SWITCH
If the engine will start with the shift selector in any
range other than N or P range, adjustment is required.
(a) Loosen the neutral start switch bolts and set the shift
selector to the N range.
(b) Align the groove and neutral basic line.
(c) Hold in position and tighten the bolts.
Torque: 55 kg±cm (48 in.±Ib, 5.4 N±m)
7. INSPECT IDLE SPEED (N RANGE)
Idle speed: 700 rpm 4. INSPECT AND ADJUST THROTTLE CABLE
(a) Depress the accelerator pedal all the way and check that the
throttle valve opens fully.
HINT: If the valve does not open fully, adjust the accelerator
link.
(b) Fully depress the accelerator pedal.
(c) Loosen the adjustment nuts.
(d) Adjust the outer cable so that the distance between the end
of the boot and stopper on the cable is the standard.
Standard boot and cable stopper distance:
0± 1 mm 10±0.04 in.)
(e) Tighten the adjusting nuts.
(f ) Recheck the adjustments.
± AUTOMATIC TRANSAXLETroubleshooting (Preliminary Check) (A144L and A140E)AT±22

4. INSPECT WATER TEMPERATURE SWITCH
(a) Disconnect the switch connector.
(b) Using an ohmmeter, measure the resistance between
terminal 1 and body ground.
Coolant temperature:
Below 109
°F (43°C) 0

Above 131°F (55°C)
8

(c) Connect the switch connector.(e) Turn on the ignition switch and disconnect the water
temperature switch wire.
(f) Confirm that operation sounds of the solenoid can be
heard if the O/D main switch is repeatedly turn on
and off.
(g) Turn off the ignition switch and connect the water
temperature switch wire.
2. INSPECT O/D MAIN SWITCH
(a) Remove the console box.
(b) Using an ohmmeter, measure the resistance between
terminals 1 and 3.
wSwitch ON ± Resistance: 8


wSwitch OFF± Resistance: 0

3. INSPECT O/D OFF INDICATOR
(a) Turn on the ignition switch.
(b) Turn off the O/D main switch.
(c) Check that the O/D OFF indicator lights.
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140L)AT±37

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

(e) Turn the O/D switch ON.
(d) Select the normal pattern.
(e) Drive .at around 50 km/h (31 mph) to where 7, 5 or 3
volts appears on the voltmeter (this is the lock±up
range) .
(f) Depress the accelerator pedal and read the tachometer.
If there is a big jump in engine rpm there is not lock±
up. 8. INSPECT PATTERN SELECTION SWITCH
Inspect that there is continuity between 5 and each ter-
minal. .
HINT: As there are diodes inside, be careful of the test-
er probe polarity.
10. INSPECT LOCK±UP MECHANISM
(a) Warm up the coolant and ATF.
(b) Connect a voltmeter to the check connector terminals
Tt and E1.
11. INSPECT BRAKE SIGNAL
Check that the brake light comes on when the brake
pedal is depressed. 9. INSPECT O/D SWITCH
Inspect that there is continuity between terminals 1 and 3.
S/W positionTerminal
Terminal Pattern
NORM
PWR
OFF
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±35

2. 2 RANGE TEST
Shift into the 2 range and, while driving with the accel-
erator pedal held constantly at the full throttle valve
opening position, push in one of the pattern selectors
and check on the following points.
(a) Check to see that the 1 ±2 up±shift takes place and
that the shift point conforms to it shown on the auto-
matic shift schedule. (See page AT±49)
(b) White running in the 2 range and 2nd gear, re-
lease the accelerator pedal and check the en-
gine braking effect.
EVALUATION
If there is no engine braking effect:
wSecond coast brake is defective (d) While running in the D range, 2nd, 3rd and O/D
gears, check to see that the possible kick±
down vehicle speed limits for 2 ±1, 3 ±2 and O/D
±3 kickdowns conform to those indicated on the
automatic shift schedule. (See page AT±49)
(e) Check for abnormal shock and slip at kick±down.
(f) Check for the lock±up mechanism:
(1) Drive in D range ± O/D gear, at a steady speed
(lock±up ON) of about 75 km/h (47 mph).
(2) Lightly depress the. accelerator pedal and check
that the engine rpm does not change abruptly.
If there is a big jump in engine rpm, there is no
lock±up.
(e) Check for abnormal noise at acceleration and
deceleration, and for shock at up±shift and
downshift.
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
A140E)AT±44

2. 2 RANGE TEST
Shift into the .2 range and, while driving with the accel-
erator pedal held constantly at the full throttle valve
opening position, check on the following points.
(a) Check to see that the 1 ± 2 up±shift takes place and
that the shift point conforms to it shown on the auto-
matic shift schedule. (See page AT±49) (f) Check for the lock±up mechanism.
(1) Drive in D range, O/D gear, at a steady speed
(lock±up ON) of about 70 km/h (43 mph).
(2) Lightly depress the accelerator pedal and check
that the engine rpm does. not change abruptly.
If there is a big jump in engine rpm, there is no
lock±up.
(b) While running in the 2 range and 2nd gear, re-
lease the accelerator pedal and check the en-
gine braking effect.
EVALUATION
If there is no engine braking effect:
Second coast brake is defective (d) While running in the D range, 2nd, 3rd and O/D
gears, check to see that the possible kick±
down vehicle speed limits for 2 ±1, 3 ±2 and
O/D ± 3 kickdowns conform to those indicated
on the automatic shift schedule. (See page
AT±49)
(e) Check for abnormal shock and slip at kick±down.
(c) Check for abnormal noise at acceleration and de-
celeration, and for shock at up±shift and down-
shift.
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
A140E)AT±47