OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Refuelling Pump
C-106 C-106
9803/9880-3
Refuelling Pump
Operation
C030500GB-3
Fig 96.
ECU1 Requirements
A refuelling pump can also be installed on the machine.
This pump can be used in two different modes: automatic
or manual.
Note: The refuel pump feature is only present when the
machine is fitted with a new harness. If the machine is not
fitted with a new harness the input and output pins used for
this feature are assigned to other functions
Automatic Mode
A short press of the fuel pump momentary switch is used
to turn on and off the fuel pump's automatic mode. When
the refuelling pump switch is pressed, a high (+Vbatt) is
measured at the input to the ECU1. When the button is
released, the input is open circuit and a `low' will be
measured by the ECU1. If the button is held for less than 2
seconds, then this falling edge will trigger the refuelling
pump feature into automatic mode. While in automatic
mode, the output to the refuelling pump relay is energized.
The fuel level input is monitored during this functionality.
When the fuel level reaches the Max Refuel Level, the fuel
pump output is turned off. The filtering that is normally
used to smooth out fuel level readings is not used in this
case so that there is no delay in the fuel level reading.
If a second falling edge is detected on the fuel pump input,
then the feature is de-activated and the fuel pump output
is turned off.
Note: If any errors are present on the fuel level sensor,
then the refuel pump's automatic mode is not allowed.
EMS
ECU1
O/P5 (C-13)
Ov Ref (A-20)
I/P4 (A-8)
I/P16 (A-35)
CAN bus
Refuel Pump
Switch
Fuel Level
Sensor
Refuel Pump
Motor
Refuel Pump
Relay
+24V
M