Toro 30308 Operator's Manual page 36

Here are the logical troubleshooting steps for the
SCM device.
1. Determine the output fault you are trying to
resolve (PTO, Start, or ETR).
2. Move key switch to the On position and ensure
the red power LED is illuminated.
3. Move all input switches to ensure all LED's
change state (Seat, Brake, Traction Pedal, PTO,
and Start).
4. Position input devices at appropriate position
to achieve the appropriate output. Use
the following logic chart to determine the
appropriate input condition.
5. If specific output LED is illuminated without
appropriate output function, check output
Function Power In
On Neutral
— —
Start
— —
Run
(Off
Unit)
—
Run
Ä
(On
Unit)
—
Mow
Ä
—
Hi
Temp
Warning
Figure 31
Inputs
Start Brake PTO On In Seat
On On
+
Ä Ä
Ä Ä Ä
—
Ä Ä
— —
Ä
Ä
harness, connections, and component. Repair
as required.
6. If specific output LED is not illuminated,
check both fuses.
7. If specific output LED is not illuminated and
inputs are in appropriate condition, install new
SCM and determine if fault disappears.
Each row (across) in the logic chart below
identifies input and output requirements for each
specific product function. Product functions are
listed in the left column. Symbols identify specific
circuit condition including: energized to voltage,
closed to ground, and open to ground.
Hi Hi Back
Temp Temp
Shutdown Warning
—
N/A
Ä Ä
N/A
Ä Ä Ä
—
N/A
Ä Ä
—
N/A
Ä Ä
— (A) N/A
Ä
36
Outputs
Start ETR
Lap
+ +
+
Ä
+
Ä
+
Ä
+ +
PTO
Ä
Ä
Ä
+
Ä