Toro 30807 Operator's Manual page 31

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 that
the red power LED is illuminated.
3. Move all input switches to ensure all LED's change
state.
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.
Function Power In
ON Neutral
—
Start
—
Run (Off
Unit)
—
Run (On
Unit)
—
Mow
—
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
ON
—
+
O
—
O O
—
O O
—
O O
—
O O
O
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.
PTO ON In Seat Hi Temp
—
O O
O O O
—
O O
— —
O
—
O O
—
31
OUTPUTS
Backlap Start ETR
+ +
O
+
O O
+
O O
+
O O
—
+
O
O O
PTO
O
O
O
+
+
O