Fuel Injection System Testing And Troubleshooting; (Efi Powered By Battery) - Arctic Cat Cougar Service Manual

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box shown in Figure 3. The 15 amp main fuse is
located in the circuit between the battery and the
regulator/rectifier. The 10 amp fuse protects the
fuel pump relay control circuit. The 3 amp fuse
protects the ECU and the control circuits.
On models after 1996, four fuses are located
in the fuse box attached to the ECU mounting
plate. The 5 amp fuse protects the ECU and
control circuits. The 10 amp fuse protects the fuel
pump and fuel injector circuits.
Fuel pump relay
On 1996 and earlier models, a relay controls
power to the fuel pump. The relay is located
under the console, behind the air silencer.
TESTING AND TROUBLESHOOTING
(EFI POWERED BY BATTERY)
Problems with the fuel injection system can
usually be isolated by following a series of logi-
cal steps to locate the faulty component. Corn-
pare the current conditions with those that are
standard and note any differences. Check for
obvious conditions that point to specific failure.
Check to see if the diagnostic light on the ECU
(A, Figure 4) is indicating a trouble code. Check
voltages delivered to the various components,
then check the resistance of individual compo-
nents. If you have difficulty determining EFI
faults, have an Arctic Cat dealer diagnose the
machine with the special Arctco EFI Analyzer.
NOTE
Arctco analyzer (part No. 0644-202) and
diagnostic harness (part No. 0644-181)
can be used to test systems that use a
battery for power. Arctco analyzer (part
No. 0644-212), diagnostic harness and
analyzer EPROM update kit (part No.
0644-256) can be used to test systems on
models 1997-on.
CHAPTER SEVEN
A special Arctco EFI Analyzer is available
which attaches to the EFI test plug located near
the ECU. This special tester is able to test battery
voltage, engine rpm, ignition timing, throttle
valve angles in degrees, throttle valve angle in
volts, intake air temperature in degrees Celsius,
coolant temperature in degrees Fahrenheit and
barometric pressure as determined by the in-
stalled components. The special analyzer is able
to display existing problems and malfunctions
stored in the ECU memory, as well as clear stored
trouble codes from the ECU memory. If this
analyzer is available, follow the manufacturer's
instructions carefully. The analyzer is not able to
test some items, including fuses, emergency stop
relay, fuel pump relay, fuel pressure regulator,
fuel pump, switches, connections or the main
harness.
System diagnosis
Preparation and initial checks-Read
through
the following procedures completely before
starting the tests. Some tests require special
equipment and procedures.
1. Check the battery to make sure it is fully
charged.
NOTE
The ECU will not operate
if
battery volt-
age is 9 volts or less.