Testing And Troubleshooting (Efi System Magneto-Powered) - Arctic Cat Cougar Service Manual

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1. Make sure the ignition switch is OFF.
2. Detach the sensor at the black two-wire con-
nector.
3. Use an ohmmeter to measure the resistance
between the 2 terminals of the sensor. Be sure the
wires are green/white and brown.
4. The correct resistance is 152-228 ohms. If the
resistance is incorrect, the sensor is faulty.
5. Models prior to 1997-To test the sensor
voltage output, attach the diagnostic harness as
described in this chapter.
6. Attach a voltmeter that will measure low AC
volts to pins No. 10 and No. 17 (Figure 5) of the
diagnostic harness.
7. Crank the engine as hard as possible while
observing the voltage output.
8. The voltage should be in the range of0.1-0.9
VAC.
9. If the voltage measured in Step 7 is low,
replace the sensor.
Atmospheric pressure sensor- The atmos-
pheric barometric pressure sensor is located in-
side the waterproof case containing the ECU.
The Arctco EFI Analyzer should be used to test
the atmospheric pressure sensor. If the pressure
displayed is significantly different than the ac-
tual barometric pressure, replace the ECU.
TESTING AND TROUBLESHOOTING
(EFI SYSTEM MAGNETO-POWERED)
Problems with the fuel injection system can
usually be isolated by following a series of logi-
cal steps to locate the faulty component.
Com~
pare the current conditions with those that are
standard and note any differences. Check for
obvious conditions that point to specific failure.
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. 0644-212), di-
agnostic harness and analyzer EPROM
update kit (part No. 0644-256) are used
CHAPTER SEVEN
to test the batteryless systems found on
1997 and 1998 models.
A special Arctco EFI analyzer attaches to the
EFI test plug located near the ECU. This special
analyzer is able to test engine rpm, ignition tim-
ing, throttle valve angles in degrees, throttle
valve angle, intake air temperature in degrees,
coolant temperature in degrees and barometric
pressure, as determined by the installed compo-
nents. The special analyzer displays existing
problems and malfunctions stored in the ECU
memory, as well as clear stored trouble codes
from the ECU memory. If this analyzer is avail-
able, follow the manufacturer's instructions
carefully. The analyzer is not able to test some
items, including the ECU, fuel pressure regula-
tor, fuel pump, switches, connections or the main
harness.
System diagnosis
Read the following procedures completely be-
fore starting. Tests require special equipment and
procedures.
NOTE
Use Arctco analyzer (part No. 0644-
212), diagnostic harness and analyzer
EPROM update kit (part No. 0644-256).
1. Remove the cover from the connector (A,
Figure 19) on the ECU. Attach the diagnostic
harness and Arctco analyzer to the connector.