Toro Outcross 9060 Service Manual page 275

Testing Relays with 5 Terminals
Outcross 9060
18234SL Rev B
The three relays used to control the air conditioning (AC) system are located
under the cab cover.
•
The AC condenser fans relay provides current to both of the condenser fans
and the AC clutch relay. The AC condenser fans relay is energized by the
air conditioning system thermostat.
•
The AC switch signal relay is an input to the T1: TEC. The relay is energized
by the AC On/Off switch. The T1: TEC monitors the condition of the signal
relay and increases the engine low idle RPM when the AC system is On.
•
The AC clutch relay and the AC condenser fans relay must be energized
to engage the compressor clutch. The AC clutch relay is energized by the
thermostat as long as the minimum AC system pressure exists (AC pressure
switch closed).
The AC switch signal relay, working with the air conditioning on/off switch, and
its circuit wiring can be tested as a T1: TEC input using the InfoCenter Display;
refer to Using the InfoCenter Display for Troubleshooting (page
determines that the relay and its circuit wiring are not functioning correctly,
proceed with the following test procedure:
1. Make sure key switch is OFF. Remove key from key switch.
2. Disconnect the ground cable at the battery; refer to
(page 6–81).
3. Access the relay to be tested and disconnect the wire harness connector
from the relay. Remove the relay from the mounting bracket for testing.
g256780
Note: Prior to taking small resistance readings with a digital multimeter, short
the meter test leads together. The meter will display a small resistance value
(usually 0.5 ohms or less). This resistance is due to the internal resistance
of the meter and test leads. Subtract this value from the measured value
of the component you are testing.
4. Using a multimeter, verify that coil resistance between terminals 85 and 86 is
from 71 to 88 ohms.
5. Connect multimeter (ohms setting) leads to relay terminals 30 and 87.
Ground terminal 86 and apply +12 VDC to terminal 85. The relay should
Figure 108
Page 6–67 Electrical System: Electrical Component Testing
3–23). If testing
Removing the Battery