Standard Control Module (Scm) - Toro 30809 Groundsmaster 3500-G Operator's Manual

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.
The start circuit input is energized by 12 VDC. All other
inputs are energized when the circuit is closed to ground.
Each input has an LED that is illuminated when the specific
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 LEDs 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 the output harness,
the connections, and the component. Repair as
required.
6. If specific output LED is not illuminated, check both
of the fuses.
circuit is energized. Use the input LEDs to troubleshoot
switches and input circuits.
Output circuits are energized by an appropriate set of input
conditions. The 3 outputs are PTO, ETR, and START. The
output LED indicates the presence of voltage at the relay.
Output circuits do not determine the integrity of the output
device. Troubleshooting the electrical integrity of an output
circuit should include the output LED, the device, and the
wiring harness. Measure disconnected component impedance,
impedance through the wiring harness (disconnect at SCM),
or by temporarily "test energizing" the specific component.
The SCM does not connect to an external computer or
hand-held device, it cannot be re–programmed, and it does
not record intermittent fault troubleshooting data.
The decal on the SCM only includes symbols. There are 3
LED output symbols are shown in the output box. All other
LEDs are inputs. The chart
Figure 29
7. If specific output LED is not illuminated and the
inputs are in an appropriate condition, install a new
SCM and determine if the fault disappears.
Each row in the logic chart below identifies the input and
output requirements for each specific function. The functions
are listed in the left column. The symbols identify specific
circuit condition including: energized to voltage, closed to
ground, and open to ground.
•
(–) 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.
25
(Figure 29) identifies the symbols.