TESTING

Navajo Models

1. Turn the ignition switch to the OFF position.
2. Disengage the wiring harness connector from the IAC valve .
3. Using an ohmmeter, measure the resistance between the terminals of the valve.

   NOTE: Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR terminal and the negative lead on the ISC terminal.

4. If the resistance is not 7–13 ohms, replace the IAC valve.

   Fig. 1: IAC valve wiring harness connections

Pick-up and MPV Models

NOTE: The Idle Air Control (IAC) valve is an integral component of the Bypass Air Control (BAC) valve.

1. Turn the ignition switch to the OFF position.
2. Disengage the wiring harness connector from the IAC valve .
3. Using an ohmmeter, measure the resistance between the terminals of the valve.

   Fig. 2: Checking the resistance of the IAC valve on the BAC valve assembly

4. The resistance should measure 10.7–12.3 ohms at 68°F (20°C) for 3.0L equipped models and 7.7–9.3 ohms at 73°F (23°C) for 2.6L engine equipped models.
5. If the resistance does not measure within specifications, replace the BAC valve.