somebody please explain this code . . . p0442
06-05-2002, 03:29 PM
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somebody please explain this code . . . p0442 ATAP says it's a small EVAP system leak. WTF does that mean. gurus please advise.
john
john
06-05-2002, 07:03 PM
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Re: somebody please explain this code . . . p0442 From the Helms (you guys really need to buy one <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> )
The pcm monitors the fuel tank pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The pcm commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions for running the DTC are met in order to apply an engine vacuum to the EVAP system. The pcm commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. The EVAP system should HOLD the vacuum in the sealed system. The pcm sets this DTC in order to indicate a small leak if the EVAP system fails to hold a predetermined level of vacuum for a predetermined length of time. This DTC sets after failing the above test twice.
Possible causes:
Loose, incorrect, defective or missing fuel tank cap
Disconnected,improperly routed, kinked or damaged EVAP system purge lines
A damaged EVAP system component
A loose,missing,or damaged service port dust cap and/or schrader valve.
Whew!
The pcm monitors the fuel tank pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The pcm commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions for running the DTC are met in order to apply an engine vacuum to the EVAP system. The pcm commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. The EVAP system should HOLD the vacuum in the sealed system. The pcm sets this DTC in order to indicate a small leak if the EVAP system fails to hold a predetermined level of vacuum for a predetermined length of time. This DTC sets after failing the above test twice.
Possible causes:
Loose, incorrect, defective or missing fuel tank cap
Disconnected,improperly routed, kinked or damaged EVAP system purge lines
A damaged EVAP system component
A loose,missing,or damaged service port dust cap and/or schrader valve.
Whew!
06-07-2002, 04:49 PM
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Re: somebody please explain this code . . . p0442 wow. thanks. i guess i can trouble shoot that bad boy now. i agree with you about helms. i'll get one soon.
thanks again,
slower'n **** <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
thanks again,
slower'n **** <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
06-07-2002, 08:28 PM
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Re: somebody please explain this code . . . p0442 </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by gwj:
<strong>From the Helms (you guys really need to buy one <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> )
The pcm monitors the fuel tank pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The pcm commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions for running the DTC are met in order to apply an engine vacuum to the EVAP system. The pcm commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. The EVAP system should HOLD the vacuum in the sealed system. The pcm sets this DTC in order to indicate a small leak if the EVAP system fails to hold a predetermined level of vacuum for a predetermined length of time. This DTC sets after failing the above test twice.
Possible causes:
Loose, incorrect, defective or missing fuel tank cap
Disconnected,improperly routed, kinked or damaged EVAP system purge lines
A damaged EVAP system component
A loose,missing,or damaged service port dust cap and/or schrader valve.
Whew!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">yeah we get people coming into the dealership ALL the time with a check engine light.. after pulling the codes, its usually a loose gas cap. Gotta make sure you let it click a few times...
<strong>From the Helms (you guys really need to buy one <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> )
The pcm monitors the fuel tank pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The pcm commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions for running the DTC are met in order to apply an engine vacuum to the EVAP system. The pcm commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. The EVAP system should HOLD the vacuum in the sealed system. The pcm sets this DTC in order to indicate a small leak if the EVAP system fails to hold a predetermined level of vacuum for a predetermined length of time. This DTC sets after failing the above test twice.
Possible causes:
Loose, incorrect, defective or missing fuel tank cap
Disconnected,improperly routed, kinked or damaged EVAP system purge lines
A damaged EVAP system component
A loose,missing,or damaged service port dust cap and/or schrader valve.
Whew!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">yeah we get people coming into the dealership ALL the time with a check engine light.. after pulling the codes, its usually a loose gas cap. Gotta make sure you let it click a few times...
