Contents: Coolant Temperature Switch Sensor…↓ Fuel injection system main relay ↓ Electric Fan Relay ↓ Checking the fan motor ↓
Coolant Temperature Switch Sensor (3S-FE, 4S-FE)
1. Drain the coolant and remove the coolant temperature switch.
2. Check the coolant temperature sensor switch.
a) Using an ohmmeter, check that there is no continuity between the terminals of the sensor-switch when the coolant temperature is above 93°C.
b) Using an ohmmeter, check for conductivity between the terminals of the sensor switch at a coolant temperature of no more than 83°C.
3. Install the coolant temperature sensor switch.
4. Fill with coolant.
Fuel injection system main relay
1. Remove the main fuel injection system relay.
2. Check the resistance of the relay winding.
a) Using an ohmmeter, check for conductivity between terminals "1" and "3" (resistance - 60-90 Ohm). Resistance between terminals "2" and "4" - 0 Ohm
b) Then, using an ohmmeter, make sure there is no conductivity between terminals "4" and "5" (resistance is infinity).
3. Check the operation of the relay.
a) Apply voltage from the battery to terminals "1" and "3" of the relay connector.
b) Using an ohmmeter, check for conductivity between terminals "2" and "4".
b) Using an ohmmeter, check for conductivity between terminals "4" and "5".
If the conditions specified in points 1 and 2 are not met, replace the relay.
4. If necessary, the relay housing can be removed and, before throwing it away, try to eliminate the cause of the failure. To do this, clean all contacts and check the resistance of the windings in two directions, since there may be diodes that shunt the windings.
If the winding resistances in both directions are the same, then there are no diodes, and the battery can be connected in any order. If not, then the battery should be connected observing the polarity.
5. Reinstall the relay.
Electric Fan Relay
1. Disconnect the negative terminal from the battery.
2. Remove the electric fan relay.
3. Check the electric fan relay (3S-FE, 4S-FE).
Check for continuity between terminals "1" and "2" (50-80 Ohm) and "3" and "4" (0 Ohm).
If the above conditions are not met, replace the relay.
(3C-T)
a) Use an ohmmeter to check the conductivity between terminals "86" and "85", and "30" and "87a".
b) Apply battery voltage to relay terminals "86" and "85".
c) Use an ohmmeter to check that there is no conductivity between the relay terminals "30" and "87a".
If the above conditions are not met, replace the relay.
Schematic diagram of the location of the electric fan control system components on the vehicle (3S-FE, 4S-FE).
1 - electric fan No.1,
2 - coolant temperature switch sensor,
3 - electric fan No.1,
4 - relay No.2 of the electric fan (models with air conditioning),
5 - relay No.3 of the electric fan (models with air conditioning),
6 - fuse "AM" 40A,
7 - fuse "GAUSE" 10A,
8 - fuse box,
9 - main fuse link "MAIN" 10A,
10 - relay No.1 of the electric fan,
11 - fuse "RDI" 30A,
12 - fuse "ALT 100A",
13 - main engine relay.
Checking the fan motor
1. Disconnect the fan electrical connector.
2. Connect the ammeter and battery to the fan connector as shown in the figure.
After making sure the fan rotates freely, take the ammeter reading
Nominal current:
ZS-T:
- electric fan No.1 - 13.2 A
- electric fan No.2 - 9 - 11 A
3S-FE, 4S-FE:
- electric fan No.1 - 3.2-4.4 A
- electric heater #2 (models with air conditioning) — 5.8- 7.4 A
If the ammeter reading is outside the specified range, replace the fan motor.
3. Connect the electrical connectors of the fans.