Doosan DX60R Shop Manual page 351

Stop Solenoid
The MP fuel injection pumps are equipped with a stop solenoid
that controls the fuel flow inside the fuel injection pump.
With the starter switch in the OFF position, no current flows to the
stop solenoid and the solenoid plunger is extended holding the
fuel injection pump fuel rack in the "closed" position and not
allowing fuel to flow through the injection pump and to the
engine.
When the starter switch is turned to the start position, the "pull
coil" (36.5 Amp draw / white wire) inside the solenoid is
activated and pulls the solenoid plunger into the solenoid. This
releases the fuel injection pump fuel rack, allowing fuel to flow
through the injection pump and allowing the engine to start and
run.
When the starter switch is returned to the ON or RUN position,
the "pull coil" no longer receives current and the "hold coil" (0.5
Amp draw / red wire) inside the solenoid is activated. The "hold
coil" holds the solenoid plunger in the RUN position, allowing
fuel to continue flowing and he engine to continue running.
To stop the engine, the key switch is turned to the OFF position.
Current no longer flows to the stop solenoid "hold coil", and the
solenoid plunger extends and moves the injection pump fuel
rack to the "closed" position, shutting off the fuel flow and
stopping the engine.
Failure of the stop solenoid could result in the engine not
starting, the engine stopping suddenly, the engine not
continuing to run with the key switch returned to the ON or RUN
position, or the engine failing to stop when the key switch is
turned to the OFF position. Use a multimeter or continuity light
to check for 12V at the stop solenoid connector in the correct
sequence.
Electronically controlled engines 4TNV84T-Z, 4TNV98-Z,
4TNV98-E, and 4TNV98T-Z are designed so that, when the key
is turned on or off, the corresponding signal is sent to the E-
ECU.
Thus the E-ECU controls the rack actuator to provide a
sufficient injection rate when the engine is started up (the key is
turned on) or cut the fuel supply and stop then engine when the
key is turned off. Therefore, this electronically controlled
engines does not have a stop solenoid.
Engine SP001693
Page 171