Miscellaneous - Idle Air Control; Iac Test With Engine Rpm - Quicksilver SmartCraft Systems Reference Manual

MISCELLANEOUS – IDLE AIR CONTROL
Using the OUTPUT LOAD TEST function, you can exercise the ECM
and various output loads (ignition coils, injectors, pumps, horn etc)
controlled by the ECM. Make sure the SELECT FUNCTION menu
screen is displayed on the DDT. Press the 3 key.
Select Load Test:
1–OIL PUMP PRIME
2–CYLINDER MISFIRE
3–OUTPUT LOAD TEST
4–RESET BREAK–IN
Select Load Test:
7–MISCELLANEOUS
8–TACHOMETER
9–RELAYS
Press the 7 key.
The purpose of this test is to check the functionality of the Idle Air
Control valve. The behavior of the test on a running engine will depend
on the engine coolant temperature and the idle control calibration in
the ECM. Once the engine has reached it's normal operating tempera-
ture the running test will allow you to apply a positive or a negative
offset to the base IAC setpoint. As you decrease the offset with a
negative value the engine RPM should decrease. The engine idle
control strategy may prevent you from exceeding the allowable
setpoints. For example a value of +60% may exhibit the same
behavior as a value of +100% (no noticeable change in RPM).

IAC TEST WITH ENGINE RPM

Reference Manual
2.0 Marine Diagnostics
1- Mercury Marine
Select Test:
1–ENGINE RPM
2–NO ENGINE RPM
Press the 1 key.
5 SPECIAL FUNCTIONS
Select Load Test:
1–IDLE AIR CONTROL
2–ELECT SHIFT
3–ELECT THROTTLE
Press the 1 key.
75