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INSPECTION OF ELECTRIC COOLING
FAN COMPONENTS
1. INSPECT WATER TEMPERATURE SWITCH
LOCATION: On the water inlet housing.
(a) Using an ohmmeter, check that there is no continuity be-
tween the terminal and body when the coolant
temperature is above 93°C (199°F).
(b) Check that there is continuity between the terminal and body
when the coolant temperature is below 83°C
(181 °F).
If continuity is not as specified, replace the switch.
2. INSPECT COOLING FAN RELAY (ºFAN NO.1 º)
A. Inspect relay continuity
(a) Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
(b) Check that there is continuity between terminals 3 and
4.
If continuity is not as specified, replace the relay.
4. INSPECT COOLING FAN MOTOR
(a) Connect battery and ammeter to the fan motor connector.
(b) Check that the fan motor rotates smoothly, and check the
reading on the ammeter.
Standard amperage:
3.2± 4.4A 2WD M/T
5.8 ± 7.4 A 2WD A/T and 4WD M/T
8.8 10.8A 4WD A/T B. Inspect relay operation
(a) Apply battery voltage across terminal 1 and 2.
(b) Using an ohmmeter, check that there is no continuity be-
tween terminals 3 and 4.
If operation is not as specified, replace the relay.
3. INSPECT ENGINE MAIN RELAY (See page CH±16)
High Temperature (Above 935C (1995F))
4. START ENGINE
(a) Raise coolant temperature to above 93°C (199°F).
(b) Check that the fan rotates.
If not, replace the water temperature switch.
± COOLING SYSTEMElectric Cooling Fan (3S±FE)CO±22
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ELECTRIC COOLING FANS (2VZ±FE)
SYSTEM CIRCUIT
LOCATION OF ELECTRIC COOLING FAN
COMPONENTS
± COOLING SYSTEMElectric Cooling Fans (2VZ±FE)CO±23
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ON±VEHICLE INSPECTION
Low Temperature (Below 85
°C (185°F))
1. TURN IGNITION SWITCH ºONº
Check that the fans stop.
If not, check the cooling fan relays and water temperature
sensor, and check for a separated connector or severed wire
between the cooling fan relay and water temperature
sensor.
2. DISCONNECT WATER TEMPERATURE SENSOR
CONNECTOR
Check that the fans rotate.
If not, check the cooling fan relays, fan motor, engine main
relay and fuse, and check for a short circuit between the
cooling fan relay and water temperature sensor.
3. CONNECT WATER TEMPERATURE SENSOR
CONNECTOR
INSPECTION OF ELECTRIC COOLANT
FAN COMPONENTS
1. INSPECT COOLING FAN ECC FOR CIRCUIT
Disconnect the cooling fan ECU, and check the connec-
tor on the wiring harness side as shown in the chart on the
next page.
High Temperature (85 ± 90°C (185±194°F))
4. START ENGINE
(a) Raise coolant temperature to 85 ± 90°C (185 ±194°F).
(b) Check that the fans rotate. (at low speed)
If not, replace the water temperature sensor.
High Temperature (Above 90°C (194°F))
5. START ENGINE
(a) Raise coolant temperature to above 90
°C (194°F).
(b) Check that the fans rotate. (at high speed)
If not, replace the water temperature sensor.
± COOLING SYSTEMElectric Cooling Fans (2VZ±FE)CO±24
Page 1012 of 2389
5. INSPECT NO±2 COOLING FAN RELAY
(ºAC FAN NO.2º)
A. Inspect relay continuity
(a) Using an ohmmeter, check that there is continuity between
terminals 2 and 6.
(b) Check that there is continuity between terminals 1 and 3.
(c) Check that there is no continuity between terminals 1
and 4.
If continuity is not as specified, replace the relay. 2. INSPECT WATER TEMPERATURE SENSOR
Using an ohmmeter, measure the resistance between the
terminals.
Resistance:
Approx. 1.53 k at 80°C (176° F)
Approx. 1.18 k at 90°C (194° F)
Approx. 1.03 k at 95°C (203°F)
If resistance is not as specified, replace the sensor.
3. INSPECT ENGINE MAIN RELAY (See page CH±16)
4. INSPECT NO.1 COOLING FAN RELAY (ºFAN NO.1 º)
(See page CO±22)
Ignition switch ON Ignition switch ON Tester connectionSpecified valve Condition
Battery voltageBattery voltage
Coolant temp.
Continuity
ContinuityContinuity ResistanceContinuity Check for
Voltage
Voltage
± COOLING SYSTEMElectric Cooling Fans (2VZ±FE)CO±25
Page 1013 of 2389
B. Inspect relay operation
(a) Apply battery voltage across terminal 2 and 6.
(b) Using an ohmmeter, check that there is no continuity be-
tween terminals 1 and 3.
(c) Check that there is continuity between terminals 1 and 4.
If operation is not as specified, replace the relay.
6. INSPECT No.3 COOLING FAN RELAY
(ºAC FAN NO.3º)
(See procedure EFI Main Relay on page FI±122)
7. INSPECT COOLING FAN MOTORS
(a) Connect battery and ammeter to the fan motor connector.
(b) Check that the fan motor rotates smoothly, and check the
reading on the ammeter.
Standard amperage: No. 1 12.1 ±15.1A
No.2 6.0±7.4A
± COOLING SYSTEMElectric Cooling Fans (2VZ±FE)CO±26
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EFI SYSTEM
± EFI SYSTEMFI±1
Page 1015 of 2389
SYSTEM DESCRIPTION
± EFI SYSTEMSystem DescriptionFI±2
Page 1016 of 2389
± EFI SYSTEMSystem DescriptionFI±3