Radiator Cooling Fan Motor Relay: Testing and Inspection
INSPECTION1. INSPECT NO 1 COOLING FAN RELAY
a. Remove the No. 1 cooling fan relay. (Marking: FAN NO. 1)
b. Inspect the No. 1 cooling fan relay continuity.
1) Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
2) Check that there is continuity between terminals 3 and 4.
If there is no continuity, replace the relay.
c. Inspect the No. 1 cooling fan relay operation.
1) Apply battery voltage across terminals 1 and 2.
2) Using an ohmmeter, check that there is no continuity between terminals 3 and 4.
If there is continuity, replace the relay.
d. Install the No. 1 cooling fan relay.
2. INSPECT NO.2 COOLING FAN RELAY
a. Remove the No. 2 cooling fan relay. (Marking: FAN NO. 2)
b. Inspect the No. 2 cooling fan relay continuity.
1) Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
2) Check that there is continuity between terminals 3 and 4.
If there is no continuity, replace the relay.
3) Check that there is no continuity between terminals 3 and 5.
If there is continuity, replace the relay.
c. Inspect the No. 2 cooling fan relay operation.
1) Apply battery voltage across terminals 1 and 2.
2) Using an ohmmeter, check that there is no continuity between terminals 3 and 4.
If there is continuity, replace the relay.
3) Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
d. Install the No. 2 cooling fan relay.
3. INSPECT NO.3 COOLING FAN RELAY
1. REMOVE NO.1 COOLING FAN RELAY (Marking: FAN NO.1) FROM ENGINE ROOM R/B NO.1
2. REMOVE NO.2 COOLING FAN RELAY (Marking: FAN NO.2) FROM ENGINE ROOM R/B NO.1
3. REMOVE NO.3 COOLING FAN RELAY (Marking: FAN NO.3) FROM ENGINE ROOM R/B NO.1
4. INSPECT NO.1 FAN RELAY CONTINUITY
If continuity is not as specified, replace the relay.
5. INSPECT NO.2 FAN RELAY CONTINUITY
If continuity is not as specified, replace the relay.
6. INSPECT NO.3 FAN RELAY CONTINUITY
If continuity is not as specified, replace the relay.
a. Remove the No. 3 cooling fan relay. (Marking: FAN NO. 3)
b. Inspect the No. 3 cooling fan relay continuity.
1) Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
2) Check that there is no continuity between terminals 3 and 5.
If there is continuity, replace the relay.
c. Inspect the No. 3 cooling fan relay operation.
1) Apply battery voltage across terminals 1 and 2.
2) Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
d. Install the No. 3 cooling fan relay.