Figure 31
Here are the logical troubleshooting ste ps for the
SCM device .
1. Deter mine the output fault y ou are tr ying to
resolv e (PTO , Star t, or ETR).
2. Mo v e k ey switc h to the On position and ensure
the red po w er LED is illuminated.
3. Mo v e all input switc hes to ensure all LED’ s
c hang e state (Seat, Brak e , T raction P edal, PTO ,
and Star t).
4. P osition input devices at appropriate position
to ac hiev e the appropriate output. Use
the follo wing logic c har t to deter mine the
appropriate input condition.
5. If specific output LED is illuminated without
appropriate output function, c hec k output
har ness , connections , and component. R e pair
as required.
6. If specific output LED is not illuminated,
c hec k both fuses .
7. If specific output LED is not illuminated and
inputs are in appropriate condition, install new
SCM and deter mine if fault disappears .
Eac h ro w (across) in the logic c har t belo w
identifies input and output requirements for eac h
specific product function. Product functions are
listed in the left column. Symbols identify specific
circuit condition including: energized to v oltag e ,
closed to g round, and open to g round.
Inputs
Outputs
Function
Power
On
In
Neutral
Start
On
Brake
On
PTO On In Seat
Hi
Temp
Shutdown
Hi
Temp
Warning
Back
Lap
Start
ETR
PTO
Start
— — +
⊗ ⊗
—
⊗ ⊗
N/A
+ +
⊗
Run
(Off
Unit)
— —
⊗ ⊗ ⊗ ⊗ ⊗ ⊗
N/A
⊗
+
⊗
Run
(On
Unit)
—
⊗ ⊗
—
⊗
—
⊗ ⊗
N/A
⊗
+
⊗
Mow
—
⊗ ⊗
— — —
⊗ ⊗
N/A
⊗
+ +
Hi
Temp
Warning
—
⊗ ⊗
— (A)
N/A
+ +
⊗
36
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