Radiator Cooling Fan Motor Relay: Testing and Inspection

COOLING FAN RELAY

INSPECTION




1. REMOVE NO.2 COOLING FAN RELAY (Marking: FAN NO.2) FROM R/B NO.4

2. INSPECT NO.2 COOLING FAN RELAY




a. Inspect 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.




b. Inspect the relay operation.
1. Apply battery positive 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. Check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.

3. REINSTALL NO.2 COOLING FAN RELAY




4. REMOVE NO.3 COOLING FAN (Marking: FAN NO.3) RELAY FROM R/B NO.4

5. INSPECT NO.3 COOLING FAN RELAY




a. Inspect the 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.




b. Inspect the relay operation.
1. Apply battery positive 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.

6. REINSTALL NO.3 COOLING FAN RELAY









INSPECTION
1. INSPECT NO. 1 COOLING FAN RELAY
a. Remove the R/B No. 4 cover.





b. Remove the No. 1 cooling fan relay. (Marking: FAN No. 1)





c. 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 no continuity between terminals 3 and 5.
If there is continuity, replace the relay.





d. Inspect the No. 1 cooling fan relay operation.
1) Apply battery positive voltage to 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.
e. Reinstall the No. 1 cooling fan relay.
f. Reinstall the R/B No. 4 cover.
2. INSPECT NO. 2 AND NO. 3 COOLING FAN RELAY