Corolla Wagon L4-107.5 1762cc 1.8L DOHC (7A-FE) (1993)
Radiator Cooling Fan Temperature Sensor / Switch: Testing and Inspection
Fig. 8 Main Relay Connector.
Fig. 1 Checking Cooling Fan Motor Relay
Fig. 3 Checking Fan Motor
1.
Using an ohmmeter, check temperature switch continuity. Continuity should be present when water temperature is below 181°F and absent when
water temperature is above 199°F.
2.
Inspect main relay, located in engine compartment relay box as follows:
a. Using an ohmmeter, check that continuity exists between terminals 1 and 2, Fig. 8, and 3 and 5. Confirm that continuity is not present between
terminals 3 and 4. If relay does not perform , replace relay.
b. Apply battery voltage across terminals 1 and 2, then ensure continuity exists between terminals 3 and 4 and no continuity exists between
terminals 3 and 5.
c. If relay does not perform as outlined in step e above, replace relay.
3.
Check fan motor relay, located in engine compartment relay box, as follows:
a. Using an ohmmeter, check relay continuity. If in either case continuity is absent, replace relay. Check for continuity first between terminals 1
and 2, then between terminals 3 and 4, Fig. 1.
b. Apply battery voltage across terminals 1 and 2, then confirm that continuity is not present between terminals 3 and 4. If continuity is found,
replace relay.
4.
Connect an ammeter and battery to fan motor connector, Fig. 3. Ensure that fan rotates smoothly and that current is 5.8-7.4 amps.