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Backlap
Hi Temp
Inputs
In Seat
PTO Switch
Park Brake Off
Neutral
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 "ON" 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.
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.
Function
Power
In Neutral Start
ON
Start
—
—
Run
—
—
(Off Unit)
f
Run
—
(On Unit)
Mow
—
f
Hi Temp
—
Warning
Hi Temp
—
Shutdown
(—) Indicates a circuit closed to ground. – LED ON
(f) 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.
INPUTS
Brake
PTO
In Seat
ON
ON
ON
+
f
f
—
f
f
f
f
f
f
—
—
f
—
—
—
f
f
30
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.
Hi Temp
Hi Temp
Back Lap
Shutdown
Warning
f
f
f
f
f
f
f
f
f
— (A)
—
PTO
Start
Outputs
ETR
Start
Power
OUTPUTS
Start ETR PTO
N/A
+
+
f
N/A
f
+
f
f
f
N/A
+
N/A
f
+
+
f
N/A
+
+
N/A
f
f
f
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