ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-129
7 Check Relay Circuit
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Remove radiator fan relay from relay box.
4) Check for proper connection to “E21-4” wire
terminal of ECM connector and “BLU” wire
terminal of radiator fan relay connector.
5) If OK, measure resistance between “E21-4”
wire terminal of ECM connector and “BLU”
wire terminal of radiator fan relay connector.
Is resistance 1
Ω
or less?
Go to Step 8. “BLU” wire in open or high
resistance circuit.
8 Check Relay Circuit
1) Measure resistance between “E21-4” wire
terminal of ECM connector and vehicle
body ground.
Is it infinite?
Go to Step 9. “BLU” wire shorted to
ground circuit.
9 Check Radiator Fan Relay
1) Check radiator fan relay referring to “Main
Relay, Fuel Pump Relay and Radiator Fan
Relay Inspection” in Section 6E2.
Is it in good condition?
System is in good condi-
tion.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection” in Section 0A.
Replace radiator fan relay.
Step Action Yes No
[A]: Fig. 1 for Step 2
1. Radiator fan relay
1[A]
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