Chapter 8: Troubleshooting; Using The Standard Control Module (Scm) - Toro Reelmaster 3100-D Operator's Manual

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.
Inputs
Backlap
High temperature
In seat
PTO switch
Parking brake off
Troubleshooting
Troubleshooting
G417043
Neutral
PTO
Start
ETR
Power
Outputs
Page 8–1
Chapter 8
3466-297 A