PERIODIC MAINTENANCE 2-24
10. Adjust engine speed to 2500±100 r/min (ZONE 1) and hold
for a minimum of 20 seconds.
• If buzzer sounds for approx.3 seconds, the feedback op-
eration at this ZONE was successfully finished.
Go to next step (ZONE 2).
• If no buzzer sounds within approx.2 minutes, the feed-
back operation at this ZONE failed.
Ignore this ZONE and proceed to next step (ZONE 2).
11. Repeat the procedure in step “10” at 3500±100 r/min (ZONE
2).
12. Repeat the procedure in step “10” at 4500±100r/min (ZONE
3).
13. If the feedback operation at any ZONE failed, repeat the
feedback operation at that ZONE.
14. Return the throttle to a full closed position only after the
feedback operation at all ZONEs has been successfully
finished.
NOTE:
Do not close throttle fully for more than 10 seconds while feed-
back operation is being performed.
This will cause the O
2
feedback operation to finish with incom-
plete data.
15. Approximately 10 seconds after closing the throttle, the
buzzer will sound as follows:
• If the total feedback operation was successfully finished,
a series of short (0.5 sec.) buzzer sounds will be heard.
• If the total feedback operation failed, a series of long (3
sec.) buzzer sounds will be heard.
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