BF135A•BF150A
5-94
• Idle Adjusting Screw Adjustment
Check the following before adjustment.
• Idle speed inspection (P. 3-22)
• Spark plug (P. 3-6)
• MIL is OFF. (If it is ON, troubleshoot according to the
1) Remove the propeller. Set the outboard motor in a test
tank filled with water.
• Fill the tank with water above the gear case.
2) Connect the HDS tester (P. 5-13).
• If you do not have the HDS tester, connect a digital
3) Set the SCS mode using the HDS tester.
• If you do not have the HDS tester, disconnect the red
4P connector and connect (short-circuit) the SCS
short connector to the DLC . (P. 5-57).
4) Start the engine and let it warm up with the gear in
neutral.
5) Disconnect the IAC valve 2P connector and check the
idle speed.
6) Adjust the idle speed by turning the adjusting screw.
• If adjustment cannot be made, check each vacuum
tube for disconnection and collapse, then check and
clean the throttle body (P. 5-95).
7) After adjustment, connect the IAC valve 2P connector
and clear the DTC (P. 5-14) or reset the ECM (P. 5-57).
8) Run the engine at idling for 5 minutes or more, then
check the idle speed again.
9) If the idle speed is out of the specification, repeat the
procedure from step 5) through step 8). If the idle
speed is still out of the specification, replace the IAC
valve. If the specified idle speed cannot be obtained
yet, replace the ECM with a new one and recheck.
10) After adjustment, apply the paint (Nippon Paint
Unipack #200 or equivalent) to the head of the adjust-
ing screw.
IAC VALVE
2P CONNECTOR
ADJUSTING SCREW
ADJUSTING SCREW
Apply paint here.
Specified idle speed
575 ± 30 min
-1
(rpm)
Specified idle speed
750 ± 50 min
-1
(rpm)