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SECTION 2
SYSTEM DESCRIPTION
Syn-Tech Systems, Inc. offers a passive fueling version of their world renowned Fuel Management
Unit (FMU). The FuelMaster
®
Plus FMU-3500 is built on the widely accepted FMU-2500 platform with
the addition of components required to facilitate passive operation. AIM2™ is the trademarked name
of Syn-Tech’s passive fueling system. The name AIM2™ is derived from the principle component of
the system, the second generation Automotive Information Module.
The installation procedures contained herein will only cover the taskings unique to AIM2™ passive
fueling, and any differences as they apply to FMU and software installations. Basic FMU installation
must be referred to the FMU-2500 Installation Manual. Software setup and operation must be
referred to the FMPlus User Guide.
FuelMaster
®
Passive Fueling
FuelMaster
®
passive fueling provides for secure, accountable control of fuel dispensing without the
need for user access of the FMU.
Vehicles (or other equipment items) and fuel island dispensers are fitted with passive fueling
equipment, and an FMU-3500 is installed to authorize and record fueling. The FMU-3500 links the
vehicle to the dispenser. Options are available to upgrade other existing models of FMUs to the FMU-
3500 configuration. It may not be necessary to purchase new FMUs to acquire passive fueling.
Typical Fueling Transaction: Automation and control are totally transparent to the fueling
customer in a typical AIM2™ fueling transaction. The fueling customer drives an AIM2™ equipped
vehicle up to the fuel dispenser, takes the fueling hose down, turns on the dispenser, inserts the fuel
nozzle into the fuel tank filler neck, and pumps fuel. When fueling is complete, the customer removes
the nozzle, turns off the dispenser, hangs the nozzle up, then returns to the vehicle and drives away.
Through this procedure, the passive fueling system has authorized the transaction, then recorded the
vehicle, quantity, product, hose, date, time, and odometer/chronometer reading at the time of the
transaction, and accomplished all this without user access of the FMU. Table 2-1 reflects additional
data which may be recovered by AIM2™ through an OBD II (onboard diagnostics) connection.
Availability of this data will be dependent upon the vehicle and its ability to generate the data.
Light/Heavy Duty is primarily to differentiate between the types of OBD connections available. As
shown in the table, Heavy Duty vehicles may generate more data.
Insertion of the fuel nozzle into the vehicle’s filler neck triggers the AIM2™ module (vehicle
transceiver) to send authorization information to the FMU. Upon receipt of an authorized input, the
FMU turns on the selected dispenser hose and records the fuel quantity pumped into the vehicle.
Removing the fuel nozzle from the vehicle’s filler neck ends the transaction. Fueling cannot be
resumed without reinserting the nozzle into an AIM2™ equipped vehicle, or by the user accessing the
FMU with an alternate access device (Prokee
®
, Smartcard, credit card) or keyless configured entry.
Automated transactions may only be initiated by vehicles or access devices with the same Site
Signature (unique customer identifier) as the FMU controlling the fuel dispensers.
Passive fueling transactions may also record user identification through keypad entry at the FMU, or
by passing a proximity card across the optional Proximity Card Reader.
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