Suzuki GA413 Service Manual page 462

6E-52 ENGINE AND EMISSION CONTROL SYSTEM
STEP
5 1) Turn ignition switch ON position, leaving engine
OFF.
2) Measure voltage from "a" of radiator fan relay
connector to ground, from "c" of radiator fan
relay connector to ground.
Is each voltage within 10-14V?
6 1) Turn ignition switch OFF position.
2) Connect jumper wire between "a" and "b" of
radiator fan relay connector.
Does cooling fan turn ON when ignition switch
turns ON position, leaving engine OFF?
Fig. for Step 5
ACTION
Fig. for Step 6
YES
Go to Step 6.
Faulty "R/G" wire.
If OK, substitute a
known-good ECM and
recheck.
NO
Faulty "Bl/W", "B/R" wire.
Faulty "Bl/R", "B" wire.
Faulty radiator fan motor.
Poor connection.