Diagnosis and Symptoms
ON-VEHICLE INSPECTIONLow Coolant Temperature [below 83°C (181°F)]
1. TURN IGNITION SWITCH ON
Check that the fan does not rotate.
If it does, check the fan relay and temperature switch, and check for a separated connector or severed wire between the relay and temperature switch.
2. DISCONNECT TEMPERATURE SWITCH CONNECTOR
Check that the fan rotates.
If it does not, check the fan relay, fan motor, ignition relay and fuse, and check for a short circuit between the fan relay and temperature switch.
3. CONNECT TEMPERATURE SWITCH CONNECTOR
High Coolant Temperature [above 90°C (194°F)]
4. START ENGINE
(a) Raise engine coolant to above 90°C (194°F).
(b) Confirm that the fan rotates.
If it doesn't, replace the temperature switch.
INSPECTION OF ELECTRIC COOLING FAN
1. INSPECT TEMPERATURE SWITCH
NOTE: On the water inlet housing.
(a) Using an ohmmeter, check that there is no continuity when the coolant temperature is above 93°C (199°F).
(b) Check that there is continuity when the coolant temperature is below 83°C (181°F).
If continuity is not as specified, replace the switch.
2. INSPECT ENGINE MAIN RELAY
Refer to Powertrain Management.
3. INSPECT COOLING FAN RELAY
NOTE: The relay located in the engine compartment relay box.
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.
Inspect Relay Operation
(a) Apply battery voltage across terminals 1 and 2.
(b) Check that there is no continuity between terminals 3 and 4.
If operation is not described, replace the relay.
4. INSPECT FAN MOTOR
(a) Connect the battery and ammeter to the fan motor connector.
(b) Check to see that the motor rotates smoothly, and current is as follows:
Current:
4A-GE: 3.2 - 4.4 A
4A-FE (A/T): 8.8 - 10.8 A
Others: 5.8 - 7.4 A