Toro 315-8 User Manual page 137

Sample Problem: GT2100 electric clutch will not engage
TIP: DON'T
DISCONNECT
ANY WIRES!
Seat Switch
(Operator On)
When checking
for voltage you
GN
need only touch
the terminals.
(disconnect
components
when checking
resistance.)
GN
M
G
Rw
B A1
Ignition Switch
(In Normal)
R Rw
Battery
Fuse
(20 Amp)
TIP: BE LAZY! If you have trouble
getting to a component, skip it, and go
to the next point (You can always go
back if your next reading is 0 volts.)
Sample Problem: LX420 will not crank
TIP: Use test points to
divide circuit in half.
R
1.Test point "a" for voltage.
Voltage is 12V. Problem is right
half of circuit.
Proceed to point "b".
R R
Battery
(20 Amp)
Dashed lines do not carry current
SPARK PLUG
Brake Switch
(Brake Off)
Y/W Y
4. Move Pos. lead to red wire
at PTO plug.
Bat. voltage - check PTO switch.
No voltage - check ignition switch.
Y
R
PTO Switch
PTO
(PTO On)
Clutch
(Engaged)
BU/W
W/BK
Y/BK
3. Test point "c" Voltage is 12V.
Problem is between "c" and "b".
Proceed to Point "d".
Brake Switch
(Brake Applied)
Or Or/bk
4. Test point "d". Voltage is 0V.
You disconnect the PTO switch
and find it to be defective.
S
Rw
R
B
A1
Fuse
Ignition Switch
(In Start)
TIME SAVERS
SPARK PLUG
IGNITION
MODULES
R
1. Test for voltage Across the PTO
clutch coil by connecting the Pos.
lead to the blue/white wire and the
Neg. lead to the white wire.
Bat. voltage - check clutch coil
R
resistance.
No voltage step-2. Y/BK
Relay
(Not Energized)
W
GN
3
W/BK
1
4
R
Y/BK
5
2
3. Move Neg. lead to yellow/black
wire at relay plug.
Bat. voltage - check reverse & seat
switch.
No voltage step-4.
2. Test point "b" voltage reads 0V.
Problem is between "a" and "b".
Proceed to point "c".
R
Or/w
Starter Solenoid
(Energized)
PTO Switch
(PTO Off)
Quick check:
does solenoid "click" when
Or/w
key is turned to start?
If yes, you can eliminate circuit
from fuse to solenoid coil.
R
Fuel Solenoid
(Energized)
R
Bu Gn
Headlight Harness
(Headlights on)
R
Fuel Solenoid
(Energized)
Bu
Gn
R
Bu
Headlight Harness
(Headlights on)
Seat Switch
GN
Ground
A1 Power
E-PTO Rev Sw
R/BK
RMC Module
Reverse Switch
(In Forward)
2. Move Neg. lead to
good chassis ground.
Bat. voltage - step-3.
No voltage step-4.
R
Starter Motor
(Energized)