Cannondale 5002401 Service Manual page 18

FUEL INJECTORS
Engine shown removed for clarity.
1. Left fuel injector
2. Right fuel injector
3. Fuel inlet (from fuel pump outlet)
4. Fuel outlet (to pressure regulator)
ATVs and motorcycles utilize a pair of fuel injectors
that operate (inject) simultaneously.
Pressurized fuel flows into the injectors from the
fuel pump. The fuel is delivered into the intake port
when the ECU sends voltage to the injector internal
solenoid. When the solenoid actuates, the pres-
surized fuel sprays, through the nozzle.
NOZZLE
(FUEL EXIT)
O-RING
1. Fuel injector (left or right)
CONNECT
TOP
(FUEL ENTRY)
O-RING
19 19
The fuel injectors are positioned as close as pos-
sible to the back of the intake valves. The spray
pattern is fixed. The length of time duration that the
injectors stay open is calculated by the ECU using
the calibration file and data received by the various
sensors.
Dynamic Test - Function
NOTE :
The following procedure
assumption that there is adequate fuel supply and
pressure is available in the fuel rail.
1. Check the injector wiring harness connectors.
Make sure they are secure.
2. Check that the battery is fully charged. The sen-
sor and actuators of the system depend on accu-
rate voltage readings to meter the fuel.
3. Check the air filter element. If it is dirty or blocked,
this will severely impede air flow and fuel econ-
omy.
4. Check the airbox and throttle body assemblies for
possible air leaks that would result in a leaning of
the fuel mixture.
5. Use an automotive stethoscope to determine if
each injector is working properly. You should hear
a steady clicking sound that rises and falls with
the engine speed.
If you hear nothing, use a commercially available
noid light to test for voltage present at the harness
connector.
NOTE :
If you do not have a stethoscope, you can use a
screwdriver against the injector and listen through
the handle.
Static Test - Resistance
1. Disconnect the injector, and test the resistance of
each injector across the terminals. If the
resistance value is out of specification, replace
the injectors as a pair.
SERVICE: Fuel, fuel injector, resistance
11.75 to 12.75 Ohms
2. Install the injector test light (one at a time) into
is based on the
8/14/02