Purge Flow Sensor
Turn ignition off. Disconnect Purge Flow (PF) sensor wiring harness connector. Allow sensor to cool to room temperature. Measure resistance between PFS SIG terminal and PWR GND terminal. See Fig 1 . If resistance is less than 25.5 ohms, replace PF sensor. If resistance is 25.5 ohms or more, measure resistance between PFS SIG terminal and VPWR terminal. If resistance is not 25.65-28.35 ohms, replace PF sensor. If resistance is 25.65-28.35 ohms, measure resistance between PWR GND terminal and VPWR terminal. If resistance is more than 130 ohms, replace PF sensor. If resistance is 130 ohms or less, PF sensor is okay. If fault is still present, go to CIRCUIT TEST HW under CIRCUIT TESTS in appropriate G - TEST W/CODES article.