Tracker 4x4 L4-1590cc 1.6L (1993)
Idle Speed Control Circuit
CIRCUIT DESCRIPTION:
The ECM controls a solenoid to regulate an opening at the throttle body. The amount of the opening determines the idle speed. The ISC is regulated
according to engine load. A stalling condition or rough idle could be caused by the ISC valve not functioning properly.
TEST DESCRIPTION: The numbers below refer to circled numbers on the diagnostic chart.
1.
This checks if B+ is present at solenoid.
2.
This checks if the ECM is supplying a ground path.
3.
This checks the resistance of the ISC solenoid. Should be 11-14 ohms at 20°C (68°F).