What does a purge flow sensor do?

What does a purge flow sensor do?

The purge valve, also known as the canister purge valve, is part of your vehicle’s evaporative emission control (EVAP) system. It traps the fuel vapors created in your fuel tank and prevents them from escaping into the air.

What causes a purge valve to stick open?

If the computer is saying that the purge valve is stuck open it is usually because there is an EVAP leak in the system. If the purge valve is new I usually check the wiring and the signal going to the valve to make sure it is not shorted keeping the valve open.

What are the symptoms of a bad purge flow sensor?

– If the throttle position sensor circuit fails, rough idle, poor acceleration or shift shock (AT) may occur. fPage 2239 Purge Flow Sensor: Testing and Inspection PURGE FLOW SENSOR (PFS) INSPECTION 1. Disconnect the vacuum hoses from the Purge Flow Sensor (PFS). 2. Plug the port leading to the evaporative emission canister purge solenoid valve.

What are the diagnostic codes for the mass air flow sensor?

– If the mass air flow sensor or circuit has an open or short, Diagnostic Trouble Code No. P0l02, P0103, P1100 or P1101 is output. – A malfunction in the mass air flow sensor circuit may cause lack of power, poor acceleration, hesitate at Driveaway or vehicle shake on deceleration.

What are the symptoms of mass air flow sensor failure?

– A malfunction in the mass air flow sensor circuit may cause lack of power, poor acceleration, hesitate at Driveaway or vehicle shake on deceleration. – If battery power circuit shorts to ground, engine may stall and may not restart.

How do you use a purge flow sensor on a vacuum?

Disconnect the vacuum hoses from the Purge Flow Sensor (PFS). 2. Plug the port leading to the evaporative emission canister purge solenoid valve. 3. Apply 13.6 kPa (104 mmHg, 4.1 in.Hg) to the PFS.