Testing; Troubleshooting - Toro 22317 Service Manual

Testing

The solenoid has 3 wires:
• White wire is energized when the key is turned
to the START position and energizes the Pull
Coil to draw in the plunger and return spring, in
turn moving the speed control plate. The white
wire is spliced to the blue fusible link wire that is
connected to the push-on terminal on the starter.
• Red (or Pink) wire energizes the Hold Coil after
the engine starts and the key is released to RUN
position. It is connected to the ignition switch I
terminal.
• Black wire is connected to ground.
When the key is turned to the OFF position all voltage
to the solenoid is lost; the return spring in the solenoid
moves the speed control plate to cut off fuel flow and
shut down the engine.
Toro Wheeled CUL Service Manual
4-PAW DIESEL/ELECTRICAL

Troubleshooting

1. Check that the speed control plate and related
linkage is free to move.
2. If the engine cranks, check that the fuel shut down
solenoid is moving the speed control plate to admit
fuel to the injector pump. If not, check for 12VDC
at the white wire when the ignition switch is in the
START position.
3. Check for 12VDC at the red (or pink) wire with the
ignition switch in the START or RUN position.
4. If the engine starts but quits as soon as the key
is released, there is a problem with the Hold Coil
circuit.
5. If the electrical supply to the shut down solenoid
checks OK:
Symptom: Engine will crank, but not start, or starts and
then quits. The Pull or Hold coil may be weak, or there is
a mechanical problem inside the solenoid.
Open the engine cover and push on the solenoid linkage
to open fuel flow to the injector pump. If the engine
starts and runs while holding the linkage, the shut down
solenoid is faulty.
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