ISC Servo Stepper Motor (1.6L, 2.0L & 3.0L)
CAUTION:
Apply only 6 volts DC or less to ISC motor connector. Higher voltage could cause ISC motor gears to lock up.
- Check for sound from 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 terminals No. 1 and 2. See Fig 1 . Measure resistance between terminals No. 4 and 5 and then terminals No. 5 and 6. Resistance should be 28-33 ohms at 68°F (20°C). To check stepper motor operation, remove 6-terminal ISC 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 finally 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.