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6-102 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Step
3
Check Radiator Cooling Fan Control Relay.
1) Turn ignition switch OFF and remove radiator
cooling fan relay.
2) Check for proper connection to the relay at
"BLK/RED", "BLU", "BLU/RED" and "BLU/BLK"
wire terminals.
3) If OK, then measure resistance between termi-
nals a and b. See Fig. 2 and 3.
Is it 56 – 146 Ω?
Fig. 1 for Step 2
Fig. 2 for Step 3
Fig. 3 for Step 3
Action
1
1. Radiator fan relay No.1
Yes
"BLK/RED" or "BLU" cir-
cuit open or short.
If wires and connections
are OK, substitute a
known-good ECM and
recheck.
No
Replace radiator cool-
ing fan relay.
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