1986 TOYOTA CAMRY V20 ECU

5. Diagnostic code 64 (Lock±up solenoid valve circuitry)
Check resistance of lock±up solenoid valve at NG 4. Diagnostic code 63 (No. 2 solenoid valve circuitry)
Check resistance of No. 2 solenoid valve at NG 3. Diagnostic code 62 (No. 1 solenoid valve circuitry)
Check resistance of No. 1 solenoid valve at NG
Remove the oil pan and check resistance of
No. 1 solenoid valve connector and body ground.
Resistance: 11 ± 15

Remove the oil pan and check resistance of lock±
up solenoid valve connector and body ground.
Resistance: 11 ± 15
Remove the oil pan and check resistance of
No. 2 solenoid valve connector and body ground.
Resistance: 11 ± 15
Check resistance of No. 2 solenoid valve at
ECT ECU connector. (See page AT±33)
Check resistance of lock±up solenoid valve at
ECT ECU connector. (See page AT±33) Check resistance of No. 1 solenoid valve at
ECT ECU connector. (See page AT±33)
Check wiring between lock±up solenoid valve and
ECT ECU. Check wiring between No. 2 solenoid valve and.
ECT ECU. Check wiring between No. 1 solenoid valve and
ECT ECU.Replace No. 1 and No. 2 solenoid
valves.
Replace No. 1 and No. 2 solenoid
valve.
Substitute another ECT computer.
Replace lock±up solenoid valve. Substitute another ECT ECU.
Substitute another ECT ECU.
± AUTOMATIC TRANSAXLETroubleshooting (Diagnosis System) (A140E)AT±20

Preliminary Check
11. CHECK FLUID LEVEL
HINT: The vehicle must have been driven so that the
engine and transmission are at normal operating tem-
perature. (fluid temperature: 158 ± 176
°F or 70 ±80°C)
(a) Park the vehicle on a level surface, set the parking
brake.
(b) With the engine idling, shift the shift lever into all posi-
tions from P to L position and return to P position.
HINT: Depress the brake pedal.
(a) Pull out the transaxle dipstick and wipe it clean.
(b) Push it back fully into the tube.
(c) Pull it out and check that the fluid level is in the HOT
range. If the level is at the low side of the hot range,
add fluid.
Fluid type: ATF DEXRON) II
NOTICE: Do not overfill.
2. CHECK FLUID CONDITION
If the fluid smells burnt or is black, replace it
3. REPLACE ATF
NOTICE: Do not overfill.
(a) Remove the drain plug and drain the fluid.
(b) Reinstall the drain plug securely.
(c) With the engine OFF, and new fluid through the dip
stick tube.
SST 09043±38100
Fluid: ATF DEXRON) II
Capacity:
Dry fill:
A140E 5.3 liters (5.6 US qts, 4.7 Imp. qts)
A140L 5.7 liters (6.0 U S qts, 5.0 Imp. qts)
Drain and refill (Reference):
140E, A140L 2.5 liters (2.6 US qts, 2.2 Imp. qts)
(d) Start the engine and shift the selector into all positions
from P through L and then shift into P.
(e) With the engine idling, check the fluid level. Add fluid
up to the ºCOOLº level on the dipstick.
(f) Check the fluid level with the normal fluid temperature
(158 ± 176
°F or 70 ± 80°C) and add as necessary.
NOTICE: Do not overfill.
± AUTOMATIC TRANSAXLETroubleshooting (Preliminary Check) (A140L and A140E)AT±21

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

Disconnect ECT ECU connector and road test.
Does the transaxle operate i n the respective gear
when in the following ranges while driving?
D range . . Overdrive
2 range . . 3 rd gear
L range . . . 1 st gear
TROUBLESHOOTING FLOW±CHART
Trouble No.1 No Shifting
Connect a voltmeter to the check connector termi-
nals Tt and E1.
Does ECT terminal voltage vary with changes in
throttle opening?
Is voltage between ECT ECU terminals
BK and GND as follows?
0V: Brake pedal released
10 ± 14 V: Brake pedal depressed Warm up engine
Coolant temp.: 17f6°F (80°C)
ATF temp.: 122 ± 176°F (50 ± 80°C)
wECU power source and ground faulty
wThrottle position signal faulty
wECT terminal wire open or short
Ye s
Continued on page AT±27Brake signal
faulty
Transaxle faulty Ye s
Ye s
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A±1 40E)AT±26

Connect ECT ECU connector and road test.
Does ECT terminal voltage rise from 0V
to 7V in sequence?
Are there battery voltage between
ECT ECU terminals 2 ± GND
when in the D range?
Are there battery voltage between ECT ECU
terminals L ± GND when in the D range?
Neutral start switch circuit faulty
Neutral start switch faultyProceed to trouble 3
(See page AT±29) Continued from page AT±26
Transaxle faulty
Solenoid faulty
Try another ECT ECU.0
7V
0
3V0
5V
Ye sYe s
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±27

Connect a voltmeter to the check connector
terminals Tt and El.
Does ECT terminal voltage vary with changes in throttle
opening?
Check voltage between ECT ECU terminals
PWR and GND.
Power pattern: 10 ± 14V
Normal pattern: 1VIs voltage between ECT ECU terminals
BK and GND as follows?Tt
0V: Brake pedal released
10 ± 14V: Brake pedal depressed Warm up engine
Coolant temp.: 176°F (80°C)
ATF temp.: 122 ± 176°F (50 ± 80°C)
wECU power source and ground faulty
wThrottle position signal faulty
wECT terminal wire open or short
Faulty pattern select switch system
Shift point too high or too low
wFaulty ECT ECU
w|Faulty transaxle
Trouble No. 2
Brake sig-
nal faulty Ye s
Ye s
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±28

Is voltage between terminals OD2 and GND as fol-
lows?
O/D switch turn ON: 10 ± 14V
O/D switch turn OFF: 0VRoad test while shifting manually with ECT
ECU connector disconnected.
Is there overdrive up±shift in the D range when
shifting from L to 2 to D?
Is voltage between terminals OD, and GND as fol-
lows?
Approx. 5 V
Is voltage between ECT ECU terminals
OD, and GND normal with the cruise control com-
puter connector pulled out?Connect ECT ECU connector, and while driving
does ECT terminal voltage rise from
0V to 7V in sequence?
No up±shift to overdrive (After warm±up)
Are there battery voltage between
ECT ECU terminals L and GND
when in the D range?Are there battery voltage between
ECT ECU terminals 2 and
GND when in the D range?
wFaulty neutral start switch circuit
wFaulty neutral start switch
Faulty ECT ECU
Faulty cruise control wire harnessFaulty O/D switch harness
Faulty O/D switch
Faulty cruise control computer±Faulty transaxle
Faulty solenoid
Try another ECT ECU
Try another ECT ECUFaulty transaxle
Trouble No. 3
Ye sYe s
Ye s
Ye sYe sYe s
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±29

Road test
Connect a voltmeter to the check connector
terminals Tt and El.
Is there 7, 5 or 3 V in the lock±up range while driving?
Is voltage between ECT ECU Terminals
BK and GND as follows?
Brake pedal depressed: 10 ± 14V
Brake pedal released: 0V Warm up engine ,
Coolant temp.: 176°F (80°C)
ATF temp.: 122 ± 176°F (50 ± 80°C)
wLock±up solenoid stuck
wFaulty transmission
wFaulty lock±up mechanism
wFaulty ECU power source and ground
w Faulty throttle position signal
No lock±up (After warm±up)
Faulty brake signal Trouble No. 4
Ye s
Ye s
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±30