* With A140E Transaxle
ELECTRONIC CONTROL CIRCUIT
ELECTRONIC CONTROL COMPONENTS
TROUBLESHOOTING FLOW-CHARTS
Trouble No.1 No Shifting (Part 1 Of 2):
Trouble No.1 No Shifting (Part 2 Of 2):
Trouble No.1 No Shifting
Trouble No 2 Shift Point Too High Or Too Low:
Trouble No 2 Shift Point Too High Or Too Low
Trouble No 3 No Up-shift To Overdrive (After Warm-up):
Trouble No 3 No Up-shift To Overdrive (After Warm-up)
Trouble No.4 No Lock-up (After Warm-up):
Trouble No.4 No Lock-up (After Warm-up)
INSPECTION OF ECT 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 ECT and E(1).
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.
2. INSPECT BRAKE SIGNAL
a. Depress the accelerator pedal until the ECT terminal indicates 8 V.
b. Depress the brake pedal and check the voltage reading from the ECT terminal.
Brake pedal depressed ... 0V
Brake pedal released ... 8V
If not as indicated, there is a malfunction in either the stop light switch or circuit.
3. INSPECT EACH UP-SHIFT POSITION
a. Warm up the engine.
Coolant temperature: 176 °F (80 °C)
b. Turn the O/D switch to "ON".
c. Place the pattern select switch in "Normal" 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 0 V to 7 V in the sequence shown, the control system is okay.
The following chart shows the voltmeter reading and corresponding gears.
NOTE: 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 accelerator pedal to 50% or more of its stroke. At less than 50%, the voltage may change in the sequence 2V - 4V - 6V - 7V.
INSPECTION ELECTRONIC CONTROL COMPONENTS
1. INSPECT VOLTAGE OF ECT ECU CONNECTOR
a. Remove the glove box and instrument panel.
b. Turn on the ignition switch.
c. Measure the voltage at each terminal.
2. INSPECT SOLENOID
a. Disconnect the connector from the ECT computer.
b. Measure the resistance between S(1), S(2), S(L) and ground.
Resistance: 11 - 15 ohm
c. Apply battery voltage to the solenoid. Check that an operation noise can be heard from the solenoid.
NOTE: If there is foreign matter in the solenoid valve, there will be no fluid control even with solenoid operation.
3. CHECK SOLENOID SEALS
If there is foreign material in the solenoid valve, there will be no fluid control even with solenoid operation.
a. Check No.1 and No.2 solenoid valves.
- Applying 5 kg/Sq. cm (71 psi, 490 kPa) or compressed air, check that the solenoid valves do not leak the air.
- When supply battery voltage to the solenoids, check that the solenoid valves open.
b. Check the lock-up solenoid valve.
- Applying 5 kg/Sq. cm (71 psi, 490 kPa) of compressed air, check that the solenoid valve opens.
- When supply battery voltage to the solenoid, check that the solenoid valve does not leak the air.
4. INSPECT NEUTRAL START SWITCH
Inspect that there is continuity between terminal LL-C, 2L-C and NL-C.
5. INSPECT THROTTLE POSITION SENSOR
Using an ohmmeter, check the resistance between each terminal.
6. INSPECT 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 deflects from 0 to infinity ohm
7. INSPECT SPEED SENSOR IN COMBINATION METER (ANALOG Type)
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 infinity ohm (DIGITAL Type)
8. INSPECT PATTERN SELECTION SWITCH
Inspect that there is continuity between 5 and each terminal.
NOTE: As there are diodes inside, be careful of the tester probe polarity.
9. INSPECT O/D SWITCH
Inspect that there is continuity between terminals 1 and 3.
10. INSPECT LOCK-UP MECHANISM
a. Warm up the coolant and ATF.
b. Connect a voltmeter to the service connector terminals ECT and E(1).
c. 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.
11. INSPECT BRAKE SIGNAL
Check that the brake light comes on when the brake pedal is depressed.