Diode Assembly; Rpm Shutdown Module (Workman Mdx) - Toro Workman MD Service Manual

Diode Assembly

The diode D1 (Fig. 17) is used to protect the ignition
switch from voltage spikes that can occur when the start-
er solenoid is de--energized. The diode plugs into the
wiring harness.
Testing
The diode can be tested using a digital multimeter
(diode test or ohms setting) and the table to the right.

RPM Shutdown Module (Workman MDX)

The RPM shutdown module allows the engine to contin-
ue running briefly after the accelerator pedal is released
and the vehicle is decelerating. The module monitors
engine speed at the engine stop switch terminal.
Through the RPM shutdown module, the engine ignition
system is not grounded until the engine speed has
slowed to approximately 1300 RPM. By allowing the en-
gine to continue running briefly during vehicle decelera-
tion, better vehicle performance can be achieved.
Testing
1. Make sure that accelerator switch is working correct-
ly and is adjusted properly (see Accelerator Switch in
this section).
2. Place drive system in the NEUTRAL position.
3. Connect an ignition spark tester in series between a
spark plug and spark plug wire.
4. Start engine and monitor engine speed with a
tachometer. Press the accelerator pedal to raise engine
speed briefly and then release pedal while watching the
tachometer and spark tester. When engine speed de-
creases to approximately 1300 RPM, the spark tester
should register no spark and the engine should stop.
Workman MD/MDX
1
1. Diode
2. Male terminal
Multimeter
Red Lead (+)
on Terminal
Female
Male
2
1. RPM shutdown module
Page 6 - - 15
2
Figure 17
3. Female terminal
Multimeter
Black Lead (- -) Continuity
on Terminal
Male YES
Female NO
1
Figure 18
2. Stop switch terminal
Electrical System
3