OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Engine Start/Stop
C-40 C-40
9803/9880-3
Engine Start/Stop
Operation
C031471GB-2
Fig 42.
Starting/Stopping the engine
When the ignition key is turned to the crank position, 24v
is fed to:
– the ECU on i/p 28, (A-26) - Crank,
– the ECM on i/p V46 - START,
– the Safety Relay.
The ECU provides 24v from o/p 22 (C-26), through the
closed contacts of the Emergency Stop button on the FSP
to the coil of the emergency stop selay. The relay is
energized, removing 24v from the ECM i/p V47 - ENGSTP.
The safety relay provides an output to the starter motor,
and the ECM starts the engine.
When the engine is running, if the ignition key is switched
off, the 24v from ECU o/p 22 (C-26) to the emergency stop
relay is removed. The relay is de-energized, feeding 24v
from the battery to the ECM i/p V47 - ENGSTP, and the
engine is stopped.
Pressing the Emergency Stop Button
If the emergency stop button on the FSP is pressed whilst
the engine is running, the 24v from ECU o/p 22, (C-26) to
the Emergency Stop Relay is stopped. The relay is de-
energized, feeding 24v from the battery to the ECM i/p V47
- ENGSTP, and the engine is stopped.
At the same time the EMS will display the message 'EMER
STOP'. If the ignition is switched off and then back on, the
system retains the emergency stop function until the
emergency stop button on the FSP is pressed again.
Engine start is disabled unless the lever lock arm is raised.
if the ignition is switched on and the lever lock arm is
raised, the emergency stop remains off and the engine will
not start. If cranking is attempted while the lever lock arm
is down, the LIFT_LEVER message is displayed on the
EMS and the servo isolator LED will flash on the EMS for
the duration of the cranking.