Toro 30856 Operator's Manual page 27

1. Input
2. Backlap
3. High temp shutdown
4. High temp warning (Not
used)
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.
4. Position input devices at appropriate position to
achieve the appropriate output. Use the following
logic chart to determine the appropriate input
condition.
Note: - 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
5. In seat
6. PTO switch
7. Park brake off
8. Neutral
Figure 19
9. Output
10. PTO
11. Start
12. ETR
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.
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.
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
27
13. Start
14. Power