PERIODIC MAINTENANCE 2-17
9. When finished adjusting the idle speed, opening the throttle
will automatically cancel the IAC fixed mode.
NOTE:
The fixed mode of IAC can also be canceled manually by shift-
ing to Forward or Reverse or raising the engine speed (causes
the fully close throttle signal of TPS to be OFF ).
10. Return the throttle to full close and check engine speed. It
should now be stable at 600 – 700 r/min.
NOTE:
Idling/trolling speed of 600 – 700 r/min. is controlled by IAC (idle
air control) system.
If engine speed does not return to specification, IAC passage
may be clogged or IAC system may not be operating correctly.
See “IDLE AIR CONTROL SYSTEM” section on page 3-28.
NOTE:
Trolling speed (in-gear idle speed) is same as idle speed.
IGNITION TIMING
NOTE:
Before checking the ignition timing, make sure idle speed is
adjusted within the specification.
1. Start the engine and allow to warm up.
2. Attach the timing light cord to the No. 1 ignition coil primary
wire.
! 09930-76420: Timing light
09900-26006: Engine tachometer
3. Check the ignition timing while operating the engine in neu-
tral gear at 1 000 r/min.
Ignition timing: Approx. BTDC 0° ± 5° at 1 000 r/min.
Inspect every 200 hours (12 months).
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