18
Hookup
Active Fuel Injector Tester User Guide
Step 1—Connect AFIT to the Vehicle
There are three ways to connect AFIT to the test vehicle: DLC Connection, Direct Injector
Connection, and Direct Injector and Fuel Pump Connection. The connection you will use depends
on the vehicle being tested.
DLC Connection
Used with most vehicles, this connection controls the injectors and the fuel pump through the
DLC. Use this hookup when using the vehicle’s diagnostic link for injector control. This connection
does not
require the use of an injector harness.
Procedure:
1. Connect one serial cable to the MCU and the DLC adapter.
2. Connect the DLC adapter to the Serial to OBDII cable.
3. Connect the Serial to OBDII cable to the vehicle’s OBDII connector.
4. Connect the Fuel Schrader Connector to the vehicle’s fuel rail at the fuel test port.
5. Insert the drain hose into an approved fuel storage container.
POWER
Fuel Management Unit
ENTER
CANCEL
DOWN
ON / OFF
UP
Vehicle’s fuel rail
To vehicle’s battery
To approved
fuel storage
container
To vehicle’s
OBDII Connector (DLC)
Fuel test
port
IMPORTANT
Hang the FMU vertically
from vehicle’s hood
Interconnect
Cable
FMU
Serial
Cable
DLC adapter
MCU
Serial to OBDII
Cable
