8
AFIT Hardware
Active Fuel Injector Tester User Guide
The Main Control Unit (MCU)
The Main Control Unit (MCU) is used for functions such as selecting and starting tests, monitoring
the status of a test, interfacing with the vehicle, and controlling the Fuel Management Unit (FMU).
Using the Keypad
The main functions of the keypad are:
•
UP
and
DOWN
—scroll within a screen
•
CANCEL
—return to the previous screen
or to cancel a test
•
ENTER
—start or continue a test
•
ON/OFF
—power the unit on or off
Note: For certain screens, the buttons may have additional functions, such as turning the
fuel pump on during pressure leak down.
Using the Connector Panel
Use the connector panel on the MCU for power and communication connections:
•
Injectors Port
—connect the 24-pin
end of the injector harness or J-Cable
adapter to this port when testing on
vehicles without DLC injector control.
•
PWR Port
—connect the selected power
cord (12V adapter or wall outlet adapter)
here to provide power to the unit.
•
FMU Port
—connect the interconnect cable from the FMU to this port to provide power to
the FMU and to send test signals to and from the MCU.
•
RS-232 Port
—connect the 9-pin serial cable here to link with the vehicle or to connect the
MCU to a computer .
•
Fuel Pump
—connect the fuel pump electrical access (FPEA) cable here when testing on
vehicles without DLC fuel pump control.
Main Control Unit — Front View
ENTER
CANCEL
DOWN
ON / OFF
UP
Main Control Unit—Connector Panel
INJECTORS
PWR
FMU
RS-232
FUEL
PUMP
FMU Port
Injectors Port
PWR Port
RS-232 Port
Fuel Pump Port
