Idle speed control (isc) system

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Dec 27, 2015, 02:41 AM

GeoMitsu

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Idle speed control (isc) system

Was surfing around and found this article thought I'd share cause it would be useful for some guys without evoscan to adjust the BISS screw :

Loosen the accelerator cable, so a slight amount of slack is present.
Connect a tachometer to the engine speed detection connector.
Turn the ignition switch ON, but DO NOT start the engine.
Wait at least 15 seconds and check the idle speed control plunger position. The plunger should extend to a fast idle position, then retract after 15 seconds. This is the initial position.
Turn the ignition switch OFF and disconnect the electrical connector for the idle speed control servo. This will lock the idle speed control plunger at the initial position. Fig. 55
Loosen the fixed speed adjusting screw (SAS) fully.
Start the engine and check that the idle speed is within specifications. Basic Idle Speed: 750 ±50 RPM
If idle speed is not as specified, adjust the idle speed control adjusting screw with a hexagon wrench. Fig. 56
Turn the fixed SAS in until the engine speed rises slightly.
Back-off the SAS to the "touch point", where the engine speed ceases to decrease.
Back-off the SAS an additional half turn from the "touch point".
Stop the engine. Readjust the accelerator cable.
Reconnect the electrical connector for the idle speed control servo and remove the voltmeter from the engine.
With the ignition switch OFF, disconnect the negative battery terminal for at least 15 seconds. This will clear any diagnostic codes that may have occurred during testing.
Reconnect the battery, start the engine and check that the engine is operating in the normal idle range.