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Troubleshooting
Step
1
Was "Engine and Emission Control System
Check" performed?
2
Check Relay Circuit
1) Disconnect radiator fan relay from relay/
fuse box with ignition switch turned OFF.
(See Fig. 1.)
2) Turn ignition switch to ON position.
3) Measure voltage between "BLK/RED" wire
terminal of radiator fan relay connector and
engine ground.
Is voltage 10 – 14 V?
3
Check Relay Circuit
1) Turn ignition switch to OFF position.
2) Install radiator fan relay to relay/fuse box.
3) Disconnect connectors from ECM.
4) Remove ECM from vehicle body and then
connect connectors to ECM.
5) Turn ignition switch to ON position.
6) Measure voltage between "G91-4" wire ter-
minal of ECM connector and vehicle body
ground.
Is voltage 10 – 14 V?
4
Check Relay Circuit
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Remove radiator fan relay from relay/fuse
box.
4) Measure voltage between "G91-4" wire ter-
minal of ECM connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V?
5
Radiator Fan Control Signal Check
1) Disconnect negative (–) cable at battery.
2) Disconnect connector from ECT sensor.
3) Connect connectors to ECM.
4) Install radiator fan relay to relay/fuse box.
5) Connect negative (–) cable to battery.
6) Measure voltage between "G91-4" wire ter-
minal of ECM connector and vehicle body
ground with ignition switch turned ON.
Is voltage about 0 V?
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M15 ENGINE) 6-31
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
System is in good condi-
tion.
No
Go to "Engine and Emis-
sion Control System
Check" in this section.
"BLK/RED" circuit is open
or high resistance wire.
Go to Step 6.
"BRN" wire shorted to
power circuit.
Substitute a known-good
ECM and recheck.
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