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2001 Cherokee - Emmissions woes


 
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capndave
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Joined: 15 Jul 2005

PostPosted: Fri Jul 15, 2005 8:44 am    Post subject: 2001 Cherokee - Emmissions woes Reply with quote

Hi Jeepers,

I have a 2001 Jeep Cherokee, 59K, well-maintained, and kept stock (apologies in advance, for keeping it stock) Wink

I'm throwing two DTC codes that appear to be emmission related:

P0442 EVAP Control System Leak Detected (small leak)
P0455 EVAP Control System Leak Detected (gross leak)

I was hoping someone had advice on what the common root cause of
such DTC codes might be. The gas cap is ruled out. How bout' purge solenoid?? Evap canister?? Leaky tank?? Bad lines??

Before I begin troublshooting, I guess I'm just wondering where to best start the inspection ??

Any and all opinions are very appreciated.
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ThePhantum
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Sun Jul 17, 2005 8:48 pm    Post subject: Reply with quote

There's actually a TSB on this.

"Description: Misdiagnosed Leak Detection Pump systems with diagnostic trouble codes P1494, P0442 P0455, or P0456.

Details: During evaporative system diagnosis, Leak Detection Pumps have mistakenly been replaced. A thorough inspection for pinched, kinked, or disconnected supply vacuum lines (as currently listed in the Powertrain Diagnostic Procedures) is a critical step in diagnosing DTC P1494 (LDP SW OR MECHANICAL FAULT). Additionally, the other evaporative leak faults (DTC P0442 - SMALL LEAK, P0455 - LARGE LEAK, and P0456 - VERY SMALL LEAK) should have the supply vacuum lines examined for pinches or kinks prior to any LDP component replacement. The supply vacuum lines should be checked from the engine compartment all the way to the fuel tank, including the LDP and purge system."

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97 XJ Sport with a bunch of stuff
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capndave
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Joined: 15 Jul 2005

PostPosted: Mon Jul 18, 2005 12:50 pm    Post subject: Reply with quote

Wish I would known about that TSB earlier.

Chrysler used some crappy made-in-china 5/16 hose to connect the
three sections of the evap hose going from the purge solenoid to the
canister. The connector were just ransid for a 60k mile vehicle.

Got myself some high quality hose and this did the trick.[/img]
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