Contents: Table. Voltage at the terminals of…↓ Table. Voltage at the terminals of…↓ Table. Voltage at the terminals of…↓ Table. Voltage at the terminals of…↓ Table. Voltage at the terminals of…↓
1. Check the voltage in the automatic transmission and engine control unit connector.
a) Remove the center panel.
b) Turn on the ignition.
c) Measure the voltage at each terminal of the automatic transmission control unit connector and the engine (see table "Voltage at the terminals of the automatic transmission control unit connector").
Note (for models from 1994.): signal waveform between terminals "SPD" and "E1" when the vehicle is moving at a speed of more than 20 km/h.
Note: The higher the vehicle speed, the higher the frequency of pulses generated by the speed sensor.
(A245E) waveform between terminals "SLU-" and "SLU+" when torque converter lockup is off.
(A245E) signal shape between terminals "NC2+" and "NC2-" when the vehicle is moving at a speed of about 60 km/h in the "D" range.
(A540E) waveform between pins "SLD+" and "E1", "SLD-" and "E1".
Table. Voltage at the terminals of the automatic transmission control unit connector (A241E, A245E) (5A-FE, 4S-FE)
(): only for 4S-FE.
2. Check the solenoid valves.
a) Disconnect the solenoid valve block connector.
A245E until 1994, A241E
A540H
A245E since 1994.
b) Measure the resistance between the terminals "31", "S2", "SL" and "land".
- Nominal resistance - 10-16 0m
c) (A245E)
Measure the resistance between terminals "3" and "7" of the solenoid valve connector.
- Nominal resistance - 3.5-3.9 Ohm
If the resistance is different from the specified value, check the torque converter lock-up quality control solenoid circuit.
c) Apply battery voltage to each terminal. A click indicates that the solenoid valves are working.
3. (A540N before 1994).
Check the center differential lock solenoids.
Note: The presence of foreign material in the solenoid valve may cause it to malfunction.
a) Disconnect the automatic transmission electronic control unit connector and apply battery voltage to terminals "24"-"26" (solenoid valve No.1) and "24"-"25" (solenoid valve No.2). Make sure that the solenoid valves operate.
Table. Voltage at the terminals of the automatic transmission control unit connector (A241E, A245E until 1994.) (4A-FE)
b) Check the resistance between terminals "24"-"26" (solenoid valve No.1) and "24"-"25" (solenoid valve No.2) of the automatic transmission electronic control unit connector.
- Nominal resistance - 10-16 Ohm
c) Check the resistance between each terminal of the center differential lock solenoid valve connector and ground.
- Nominal resistance - 10-16 Ohm
4. (A540N since 1994)
Check the center differential lock solenoid valve.
a) Connect the positive terminal of the battery through a 21W lamp to terminal "1" of the valve connector and the negative terminal of the battery to terminal "2", the valve should move.
b) Measure the resistance between the terminals of the valve connector.
- Nominal resistance - 5.1-5.5 0m
5. (A245E since 1994)
Check the torque converter lock-up quality control solenoid valve.
a) Connect the positive terminal of the battery through a 21W lamp to terminal "2" of the valve connector and the negative terminal of the battery to terminal "1", the valve should move.
b) Measure the resistance between the terminals of the valve connector.
- Nominal resistance - 3.5-3.9 Ohm
Table. Voltage at the terminals of the automatic transmission control unit connector (A245E since 1994.)
6. (A245E before 1994.)
Check speed sensor #2.
a) Move the selector to the "N" position and jack up the front wheels.
b) Disconnect the sensor connector and check for pulses at the "SP2" and "GND" terminals of the sensor connector when the wheel is rotating.
Table. Voltage at the terminals of the automatic transmission control unit connector (A540N before 1994.)
c) Remove the sensor. By bringing a magnet to the end of the sensor, make sure that the circuit between the terminals of the sensor connector is closed when the magnet is brought to it, and open if the magnet is missing.
7. (A245E since 1994.)
Check speed sensor #2.
Measure the resistance between the sensor connector terminals.
- Nominal resistance - 560-680 Ohm
If the measured resistance differs from the nominal value, replace the sensor.
8. Check the automatic transmission mode selection switch.
Check the conductivity between the terminals of the automatic transmission mode selection switch connector indicated in the table.
Note: the backlight lamp is connected to terminals "1" and "2" of the connector.
9. Check the overdrive switch.
When the boost mode is enabled, there should be no conductivity between terminals "2" and "4", 5; when switched off, there should be conductivity, otherwise, replace the switch.
Table. Voltage at the terminals of the automatic transmission control unit connector (A540N since 1994.)
10. Check the engine start inhibit switch.
Check the conductivity between the connector terminals indicated in the table.
A241E
A245E, A540N
If there is no continuity between the specified terminals, replace the start inhibit switch.
11. Check the continuity between terminals "1" and "2" of the brake light switch connector.
There should be conductivity when the pedal is pressed, there should be no conductivity when the pedal is released. Otherwise, replace the brake light switch.
12. Check the speed sensor No.1 (see chapter "Body electrical equipment").
13. (A540N)
Check the speed sensors.
a) Measure the resistance between terminals "6"-"7" (front Wheel Speed Sensor) and "19"-"20" (rear wheel speed sensor) connector of the electronic control unit of the automatic transmission.
- Nominal resistance - 560-740 Ohm
b) Measure the resistance between terminals "1" and "2" of the sensor connector.
- Nominal resistance - 560-740 Ohm
14. (A540N)
Make sure that when the "ON" position is selected, there is continuity between terminals "1", "2" and "5" of the interaxle differential lock switch connector. Otherwise, replace the switch.
Note: the backlight lamp is connected to terminals "3" and "4".
15. (A245E since 1994.)
Check the automatic transmission fluid temperature sensor.
Measure the resistance between terminals "1" and "5" of the solenoid valve connector.
If the resistance does not change as shown in the figure, replace the sensor.
