Relays; Solenoid Valve Coils - Toro Greensmaster 3150 Service Manual

Relays

1. Verify coil resistance between terminals 86 and 85
with a multimeter (ohms setting). Resistance should be
from 80 to 90 ohms. There should be continuity between
terminals 87A and 30.
2. Connect multimeter (ohms setting) leads to relay
terminals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as 12 VDC is ap-
plied and removed from terminal 85.
3. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
4. Connect multimeter (ohms setting) lead to relay ter-
minal 30 and 87A. Apply +12 VDC to terminal 85. The
relay should break and make continuity between termi-
nals 30 and 87A as 12 VDC is applied and removed from
terminal 85.
5. Disconnect voltage from and multimeter leads from
relay terminals.

Solenoid Valve Coils

Note: Prior to taking small resistance readings with a
digital multimeter, short the test leads together. The me-
ter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal re-
sistance of the meter and test leads. Subtract this value
from from the measured value of the component you are
testing.
1. Make sure engine and ignition switch is Off. Discon-
nect solenoid valve electrical connector.
2. Apply 12VDC source directly to the solenoid. Listen
for solenoid to switch on. Remove voltage source from
solenoid.
3. Measure resistance between the two connector ter-
minals. The resistance should be about 7.2 ohms.
4. Replace solenoid if necessary. Reconnect solenoid
valve electrical connector.
Electrical System
86 87A
85
1
1. Electrical connector
Page 5 – 10
87
86
30
TOP VIEW
Figure 8
2
Figure 9
2. Solenoid
Greensmaster 3150
87
87A
85
30
1