Idle Air Control Motor
- Check for sound from Idle Air Control (IAC) stepper motor as ignition switch is turned to ON position. If no sound is heard from stepper motor, measure resistance at stepper motor between terminals No. 2 and 3 and then terminal No. 1. See Fig 1
. Measure resistance between terminals No. 4 and 5 and then terminal No. 6. Resistance should be 28-33 ohms at 68°F (20°C). To check stepper motor operation, remove 6-terminal IAC stepper motor connector.
- Connect positive lead of 6-volt battery to ISC motor connector terminals No. 2 and 5. Connect negative lead to terminals No. 1 and 4, terminals No. 3 and 4, terminals No. 3 and 6, terminals No. 1 and 6, and terminals No. 1 and 4. Repeat procedure in reverse sequence. If stepper motor moves as voltage is applied to each pair of terminals, stepper motor is operating correctly.
Courtesy of HYUNDAI MOTOR CO.