Toro 30849 Operator's Manual page 27

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 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.
Function Power In
ON Neutral
— —
Start
— —
Run (Off
Unit)
—
Run (On O
Unit)
—
Mow O
— —
Backlap
—
Hi Temp
• (–) Indicates a circuit closed to ground. – LED ON
• (O) Indicates a circuit open to ground or
de–energized – LED OFF
• (+) Indicates an energized circuit (clutch coil,
solenoid, or start input) LED ON.
• A Blank indicates a circuit that is not involved with
the logic.
To troubleshoot, turn on the key without starting the
engine. Identify the specific function that does not
work and work across the logic chart. Inspect the
condition of each input LED's to ensure it matches the
logic chart.
If the input LED's are correct, check the output
LED. If the output LED is illuminated but the device
is not energized, measure available voltage at the
output device, continuity of the disconnected device,
and potential voltage on the ground circuit (floating
ground). Repairs will vary depending on your findings.
INPUTS
Start ON Brake PTO ON
ON
+
O O
O O O
—
O O
— —
O
—
O O
O
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.
In Seat Hi Temp Backlap
—
O
O O
—
O
—
O
O O
—
27
OUTPUTS
Start ETR
+ +
O
+
O O
+
O O
+
O O
—
+
O
O O
PTO
O
O
O
+
+
O