i remember a thread about jeeps on here a while back and was in need of some help.. i have got a 2000 grand cherokee that is throwing a p1494 code.. i have researched it but its kinda shady on what and how to test this to find out whats wrong. anyone with any experience??

later than 1996 should be OBDII

Have you looked up the code?

If so, what does it say?

Searching for these fukin codes on the web is a huge pain in the ass. I went thru this on my Silverado, yea, I'm too cheap to buy the manual.

I saw this:
NUMBER: 18-01-00
GROUP: Vehicle Performance
DATE: Feb. 4, 2000
SUBJECT:
Misdiagnosed Leak Detection Pump Systems With DTC P1494, P0442, P0455, OR P0456
MODELS:
1997 - 2000 (AB) Ram Van
1997 - 2000 (AN) Dakota
1997 - 2000 (BR/BE) Ram truck
1998 - 2000 (DN) Durango
1997 - 2000 (FJ) Avenger/Sebring/Talon
1997 - 2000 (JA) Cirrus/Stratus/Breeze
1997 - 2000 (JX) Sebring Convertible
1997 - 2000 (LH) Concorde/Intrepid/LHS/3OOMNision
1997 - 2000 (NS) Town & Country/CaravanNoyager
1997 - 2000 (PL) Neon
1997 - 2000 (PR) Prowler
1997 - 2000 (SR) ViperNiper GIS
1997 - 2000 (TJ) Wrangler
1999 - 2000 (WJ) Grand Cherokee
1997 - 2000 (XJ) Cherokee
1997 - 1998 (ZJ) GrandCherokee
DISCUSSION:
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



Another guy says, it may be the seal on your gas cap preventing evap pump up and setting the code.

List of TSBs, jeep GC at:
http://www.edmunds.com/maintenance/re ... pe=tsb&styleId=12652&zip=

Good Luck

Check here - guy posted diagnostics:

http://www.2carpros.com/forum/2001-ot ... -code-p1494-vt119413.html

Matthew

PS - moved to other vehicles section.

it was a rubber elbow that had deteriorated and had come off the manifold. i replaced it with a section of hose. i followed other steps to try and make sure it was nothing else. as of yet the light hasn't come back on. thanks for the info!

See, we can help with more than just vettes! Glad you got it worked out.

Matthew