929 V6-3.0L SOHC (1989)
Idle Speed: Adjustments
Because the idle speed is controlled automatically by the engine control unit through the idle speed control (ISC) solenoid valve, adjustment is not
usually necessary. However, when the test connector (Green: 1-pin) is grounded it disables the ECU control of the idle speed. If rough idling due to low
idle speed occurs when the test connector is grounded, the idle speed should be adjusted.
PREPARATION
1.
Check engine condition (spark plugs, leaks in hoses, etc.).
2.
Turn all accessories "OFF."
3.
Warm engine and to operating temperature.
ADJUSTMENT
Fig. 27 Test Connector
1.
Connect a tachometer.
2.
Ground test connector (Green: 1-pin) with a jumper wire.
3.
Check that idle speed is within specification:
650 ± 20 rpm in "P" range
Fig. 29 Throttle Body Blind Cap