RADIATOR FAN CONTROL SYSTEM
System Inspection
Start engine and keep it running to warm it up.
Now check to ensure that radiator fan is started when coolant tem-
perature exceed 98
C (208
F) by referring “COOLANT TEMP”
of SCAN TOOL DISPLAY.
If check result is not satisfactory, check RFC relay, wire harness,
ECT sensor, radiator fan motor and, ECM (PCM).
WARNING:
Keep hands, tools and clothing away from engine cool-
ing fan to help prevent personal injury. This fan is electric
and can come on whether or not the engine is running.
The fan can start automatically in response to the ECT
sensor with the ignition switch in the “ON” position.
RADIATOR FAN MOTOR
INSPECTION
Connect battery positive terminal to terminal of radiator fan motor
connector “Bl/R” wire side and negative terminal to “B” terminal.
Check that radiator fan operates smoothly.
RADIATOR FAN CONTROL RELAY (RFC RELAY)
INSPECTION
1) Disconnect negative cable at battery.
2) Remove RFC relay (1) from its connector.
3) Check resistance between each two terminals as in table below.
If check results are as specified, proceed to next operation
check. If not, replace.
6E1-66
ENGIINE AND EMISSION CONTROL SYSTEM
SH410
TERMINALS
RESISTANCE
Between “A” and “B”
(infinity)
Between “C” and “D”
90 – 110
at 20 C (68 F)
omron
. .
made
Between “C” and “D”
60 – 88
at 20 C (68 F)
inter-
. . .
face made