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6-184 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Step
3
Main Fuse Check
1) Turn ignition switch to OFF position.
2) Disconnect connector from ECT sensor.
3) Remove main fuse from relay/fuse box.
Is main (30 A) fuse in good condition?
4
Radiator Fan Motor Circuit Check
1) Remove radiator fan relay from relay/fuse
box.
2) Measure voltage between "BLU/WHT" wire
terminal of radiator fan relay connector and
vehicle body ground.
Is voltage 10 – 14 V?
5
Check Radiator Fan Relay
1) Check radiator fan relay referring to "Main
relay, fuel pump relay and radiator fan relay
inspection" in Section 6E1.
Is it in good condition?
6
Radiator Fan Control Circuit Check
1) Disconnect radiator fan motor connector.
2) Measure resistance between "BLU/RED"
wire terminal of radiator fan motor connec-
tor and "BLU/RED" wire terminal of radiator
fan relay connector.
Is resistance 1Ω or less?
7
Radiator Fan Control Circuit Check
1) Measure resistance between "BLU/RED"
wire terminal of radiator fan motor connec-
tor and vehicle body ground.
Is it infinite?
8
Radiator Fan Control Circuit Check
1) Turn ON ignition switch.
2) Measure voltage between "BLU/RED" wire
terminal of radiator fan motor connector and
vehicle body ground.
Is voltage 0 V?
9
Radiator Fan Control Circuit Check
1) Measure resistance between "BLK" wire ter-
minal of radiator fan motor connector and
vehicle body ground.
Is resistance 1Ω or less?
Action
Yes
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 9.
Replace radiator fan
motor.
No
Replace main fuse.
"BLU/WHT" wire open or
high resistance circuit.
Replace radiator fan
relay.
"BLU/RED" wire circuit
open or poor connection.
"BLU/RED" wire circuit
shorted to ground.
"BLU/RED" wire shorted
to power circuit.
"BLK" wire open or high
resistance circuit.
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