code 442

[kristen]

now i know that this is the evap code. want i need to know is how to check the tank tube, air tube (fresh air inlet) and purge tube connections connected to a 1500cc canister.

i need as much info as possible

[hockeyman]

Re: code 442

I threw a similar code for the evap once. Give me a call tomorrow when you're done work and I'll stop by to check the things that were wrong with my car. The biggest problem was the vacuum line that ran from the front of the upper intake to the purge valve. That thing cracked and threw crazy codes for over 2 months before I found it!

[shenanigans]

Re: code 442

evap code isn't that the same one that goes off if the gas cap isn't tightened?

[kristen]

Re: code 442

yes but i tested my cap and it's perfect

[Linas]

Re: code 442

Hi,

Can anyone show on the picture where is that purge valve and that possible cracked vacuum line? My car 01' 3.8 Firebird. I've got the same code P0442.

Thanks!

[BDBLK2K3]

Re: code 442

Any new info or pics of this line?

I'v got the same code PO442, could smell gas at the rear of the car at times.

Replace the charcoal canister last weekend, light came back on at 125 miles.

Any pics or more info would be great .

Thanks
Bob

[kristen]

Re: code 442

try your purge valve.

[David8399]

Re: code 442

DTC P0442
System Description
This DTC tests the evaporative emission (EVAP) system for a small leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the vacuum decay rate. At an appropriate time, the control module turns the EVAP canister purge valve ON and the EVAP vent valve ON. This allows the engine to draw a vacuum on the EVAP system. At a calibrated time, or vacuum level, the control module turns the EVAP canister purge valve OFF, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum decay. If the control module detects a leak larger than a calibrated amount, this DTC sets.

The following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent valves.

Control Module Command
EVAP Canister Purge Valve
EVAP Canister Vent Valve

ON
Open
Closed

OFF
Closed
Open


Conditions for Running the DTC
• DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0125, P0440, P0443, P0449, P0452, P0453, P1106, P1107, P1112, P1114, P1120, P1220, or P1221 are not set.

• The ignition voltage is between 10-18 volts.

• The barometric pressure (BARO) is more than 75 kPa.

• The fuel level is between 15-85 percent.

• The engine coolant temperature (ECT) is between 4-30°C (39-86°F).

• The intake air temperature (IAT) is between 4-30°C (39-86°F).

• The start-up ECT and IAT are within 9°C (16°F) of each other.

Conditions for Setting the DTC
The EVAP system can achieve vacuum, but a vacuum decay is detected during the diagnostic test.

Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
Conditions for Clearing the MIL/DTC
• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

• Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
To aid in locating intermittent leaks, use the J 41413 EVAP Pressure/Purge Diagnostic Station to pressurize the EVAP system. Move all EVAP components while testing with the J 41416 Ultrasonic Leak Detector.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

This step verifies that a leak is present.

This step verifies that repairs are complete and that there are no other leaks in the system.

[David8399]

Re: code 442

this one has a lot of charts that just wont paste out right.

[Scrat's_Camaro]

Re: code 442

dont mean to bring up an old thread but the fresh air inlet tube mentioned in the first post, is that supposed to be connected to anything besides the canister or does it just do nothing? Cause im not getting any vacuum in the canister to open the purge valve attached to the other line on the canister, and the purge line to the canister does have vacuum going through it, so i know its not anything with the vac lines. both purge valve and canister are brand new. if i hold my finger for awhile over the other end of the fresh air inlet tube, then i get the required vacuum to the valve.