Domain Tools

2001 Chevy Lumina 3.1L

Customer Complaint = Check engine light On and codes P0440

Procedure:

1. Before starting, verify that the customer did not leave the gas cap loose at any time or fill the gas tank with the engine running. This can set code P0440.

2. Using a scanner, verify that the Fuel Tank Pressure Sensor (FTPS) voltage reads about 1.5 volts with the gas cap loose.

3. Check all Evaporative Emission Control System (EVAP) lines, seals and components for leaks. Verify the gas cap seals.

4. Verify that the purge solenoid allows vacuum to pass through when energized by a scanner. It should seal shut when de-energized.

5. Install a clean, long hose on the vent solenoid. While commanding the vent solenoid on with a scanner, place the hose to your mouth and suck briefly against the solenoid. The solenoid should be sealed shut when energized by the scanner.

6. Do this procedure with the vent solenoid several times. Vent solenoids often leak on an intermittent basis.

Potential Causes:

Evaporative Line
Gas Cap
Purge Solenoid
Vent Control Solenoid

Confirmed Fix:

Fuel Tank Filler Neck

Duration : 0:1:55

[youtube 7k41voKQX7Q]

One Response

1. HunterCO1 Says:
   June 22nd, 2010 at 4:36 pm

   OTC’s diagnostic …
   OTC’s diagnostic tools suck I would’nt give you 10 cents for that pile of shit. My boss has a genisis and my modis is ten times the machine. Half the time that piece of won’t communicate with a vehicle.

   Needless to say my boss is looking at buying a modis or possibly a versus.

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