Engine General Information and Diagnosis: 1A-254
4
Wire circuit check
1) Disconnect radiator cooling fan relay No.3 from relay
box with ignition switch turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between “BLU/BLK” wire terminal of
radiator cooling fan relay No.3 connector and vehicle
body ground.
Is voltage 10 – 14 V?
Go to Step 5.
“BLU/BLK” wire is open
circuit.
5
Radiator cooling fan control check
1) Disconnect connector from radiator cooling fan motor
No.2 with ignition switch turned OFF.
2) Turn ignition switch ON.
3) Measure voltage between “BLU” wire terminal of radiator
cooling fan relay No.3 connector and vehicle body
ground.
Is voltage 0 V?
Go to Step 6.
“BLU” wire is shorted to
other circuit.
6
Wire circuit check
1) Measure resistance between “BLU” wire terminals of
radiator cooling fan relay No.3 connector and radiator
cooling fan motor No.2 connector with ignition switch
turned OFF.
Is resistance below 3
Ω
?
Go to Step 7.
“BLU” wire is open or
high resistances.
7
Wire circuit check
1) Disconnect radiator cooling fan relay No.2 from relay
box.
2) Measure resistance between “BLK” wire terminal of
radiator cooling fan relay No.2 connector and vehicle
body ground.
Is resistance below 3
Ω
?
Go to Step 8.
“BLK” wire is open
circuit.
8
Radiator cooling fan relay check
1) Check radiator cooling fan relay referring to “Radiator
Cooling Fan Relay Inspection: in Section 1F”.
Is it in good condition?
Go to Step 9.
Replace radiator cooling
fan relay.
9
Radiator cooling fan motor check
1) Check radiator cooling fan motor referring to “Radiator
Cooling Fan Motor On-Vehicle Inspection: in Section
1F”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace radiator cooling
fan motor.
Step
Action
Yes
No
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