Electronic Control Unit (Ecu) Service; Changing The Eprom Chip - Arctic Cat Cougar Service Manual

FUEL SYSTEM-FUEL-INJECTED MODELS
7. After assembly is complete, tum the ignition
switch ON, but do not start the engine. Turning
on the ignition switch will energize the fuel
pump for about 5 seconds.
8. Check for fuel leaks.
WARNING
Do not start the engine
if
there is the
slightest fuel leak. Any leakage is haz-
ardous.
9. Start the engine and check again for leaks.
Electronic Control Unit (ECU)
RemovaUinstallation
CAUTION
Components of the ECU can be dam-
aged by static electricity. It is important
to work in an environment that prevents
static electricity. When working on or
around the ECU housing, ground your-
self to the metal case of the housing to
discharge any static electricity. If the
ECU housing is opened, ground yourself
and any tools before touching the
EPROM chip or other electrical compo-
nents located in the housing.
1. Make sure the ignition switch is OFF. Discon-
nect the ground cable from the negative terminal
of the battery.
2. Detach the electrical connectors (Figure 31,
typical) from the ECU.
253
3. Remove the fasteners attaching the ECU
mounting bracket.
4. Tip the ECU mounting bracket forward, then
remove the four screws attaching the ECU hous-
ing to the mounting bracket.
5. Installation is the reverse of removal.
Changing the EPROM chip
Except for the Eraseable Programable Read
Only Memory (EPROM) chip, individual com-
ponents of the ECU are not available separately.
1. Make sure the ignition switch is OFF. Discon-
nect ground cable from the negative terminal of
the battery.
2. Remove the screws attaching the cover to the
ECU housing. On 1996 and earlier models, see
Figure 31. On 1997 and later models, the cover
is located under the ECU housing.
NOTE
The cover may be sealed onto the hous-
ing. Do not damage the cover or housing
when removing.
3. Carefully remove the cover.
CAUTION
Ground yourself and any tools to the
metal frame of the housing before touch-
ing the EPROM chip or other electrical
components located in the housing.
4. Observe the EPROM chip installed in the
socket near the top of the circuit board. The chip
and its socket have a notch at one end to indicate
correct reference for installation.
NOTE
The ECU chip and each of the injectors
must be properly matched. On battery-
powered EFI systems, a red, yellow or
blue paint spot should be on the ECU
chip and each of the injector units. On
magneto-powered EFI systems, each in-
jector is marked with a square, circle or
triangle. The identifying color or shape
on all of the parts should be the same as