Standard Control Module (Scm) - Toro 30826 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 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 LED's for switch and
input circuit troubleshooting.
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.
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.
Output circuits are energized by an appropriate set of input
conditions. The three outputs include PTO, ETR, and
START. Output LED's monitor relay condition indicating
the presence of voltage at one of three 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 disconnected component impedance, 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 hand
held device, can not 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
LED's are inputs. The chart below identifies the symbols.
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.
23
PTO
Start
Outputs
ETR
Start
Power