Radiator Cooling Fan; Relay Operation Test (Radiator Cooling Fan); Relay Continuity Test (Radiator Cooling Fan); Radiator Cooling Fan Operation - TGB EST 1000 Service Manual

5-1. ENGINE ASSEMBLY
Relay Operation test (Radiator
Cooling Fan)
The easiest way to check the relay is to remove
it and bypass it using a jumper. If the
radiator-cooling fan is activated, replace the
relay. See illustration to find where to bypass
the relay.
Relay Continuity Test (Radiator
Cooling Fan)
1. Remove relay.
2. Use the MULTIMETER and select the Ω
position.
3. Probe relay as follows.
TERMINAL
30 87
4. Connect battery as shown and probe relay
again as follows.
TERMINAL
30 87 0.5Ω max. (continuity)
If relay failed any test, replace it.

RADIATOR COOLING FAN

Radiator Cooling Fan Operation

The ECU controls the radiator-cooling fan via
the input of the coolant temperature sensor
(CTS) and the manifold air pressure and
temperature sensor (MAP).
The radiator cooling fan should turn on when
coolant temperature reaches 98℃ and should
turn off when the coolant cools down at 95℃.
5-12
RESISTANCE
Open Circuit (OL)
RESISTANCE