Troubleshooting - Toro Reelmaster 3100-D Operator's Manual

Troubleshooting

Using the Standard Control Module (SCM)
The Standard Control Module is a potted electronic device produced in a one-size-fits-all configuration. The
module uses solid state and mechanical components to monitor and control standard electrical features
required for safe product operation.
The module monitors inputs including neutral, parking brake, PTO, start, backlap, and high temperature. The
module energizes outputs including PTO, Starter, and ETR (energize to run) solenoid.
The module is divided into inputs and outputs. Inputs and outputs are identified by green LED indicators
mounted on the printed circuit board.
The start circuit input is energized by 12 VDC. All other inputs are energized when the circuit is closed to
ground. Each input has a LED that is illuminated when the specific circuit is energized. Use the input LEDs for
switch and input circuit troubleshooting.
Output circuits are energized by an appropriate set of input conditions. The 3 outputs include PTO, ETR, and
START. Output LEDs monitor relay condition indicating the presence of voltage at 1 of 3 specific output terminals.
Output circuits do not determine output device integrity, so electrical troubleshooting includes output LED
inspection and conventional device and wire harness integrity testing. Measure the disconnected component
impedance, the impedance through wire harness (disconnect at SCM), or by temporarily "test energizing"
the specific component.
The SCM does not connect to an external computer or handheld device, cannot be re-programmed, and does
not record intermittent fault troubleshooting data.
The decal on the SCM only includes symbols. Three LED output symbols are shown in the output box. All other
LEDs are inputs. The chart below identifies the symbols.
1. Inputs
2. Backlap
3. High temperature
4. In seat
5. PTO switch
6. Parking brake off
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 the key switch to the O
3. Move all the input switches to ensure that all LEDs change state.
4. Position the input devices at the appropriate position to achieve the appropriate output. Use the following
logic chart to determine the appropriate input condition.
5. If the specific output LED is illuminated without the appropriate output function, check the output harness,
connections, and component. Repair as needed.
6. If the specific output LED is not illuminated, check both fuses.
Figure 92
7. Neutral
8. PTO
9. Start
10. ETR
11. Power
12. Outputs
position and ensure that the red power LED is illuminated.
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