Question about 1998 Dodge Dakota

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Dodge dakota vacume problem

I have a 1998 dodge dakota 4x4 3.9 litre.Truck runs good but engin light comes on.Code reads p1494 evap pump leak detected.Had it in the shop.Canged evap pump,gas tank cover,checked hoses,and wiring.Well never checked wiring through out.
Would appreciate a solution as to what the problem may be.Perhaps someone has run into this problem and solved.If so could you share it with me.Even an idea what the problem may be.i HAVE TALKED TO A DODGE TECH. AND HE NOT SURE WHAT THE PROBLEM MAY BE AFTER ALL THAT WE HAVE DONE.


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  • mpko Jan 18, 2009

    thanks splash the smoke machine sounds effective.i will give it a try if i can find one.



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You need a diagnostic box to tell you what the problem is.......if it is a evap leak,it could be anywhere,the hoses,the gas tank seal,a cracked hose.If you can go to a dealer they might have a smoke machine, they watch to see where white smoke is escaping from.Which is impossible to tell other wise. Could even have over filled the gas tank,that would give you an engine light......

Posted on Jan 17, 2009

  • splash72471 Jan 18, 2009

    Only a dealer would have a smoke machine, we have one at our Plant that builds the Dodge Truck, but they are about expensive and as far as i know only a dealer would have one........with all the hoses,plastic parts,canister,the seal on top of the gas tank,the hose connection to the filler tube and any other hoses......they crack over time. I think i said before,over filling your gas tank can make the engine light go. One more thing, i think at pep Boys or Auto Zone,they have a code book......or the dealer should have the code book and the code would tell you what the problem is, like a vapor leak, but not where it is.........



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The Dodge P1494 engine light code means Leak Detection Pump Switch or Mechanical Fault. A proper diagnosis must be done, you can't simply replace the LDP and expect that to fix the problem. It shouldn't hurt anything to keep driving it for a while until you can get it fixed.
There is a technical service bulletin that applies to your vehicle and it mentions that code specifically. I'm including it here for your information: TSB-18-01-00
SUBJECT: Misdiagnosed Leak Detection Pump Systems With DTC P1494, P0442, P0455, OR P0456.
MODELS: 1997 - 2000 (LH) Concorde/Intrepid/LHS/300M/Vision and others
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.


Hope helps (remember rated and comment this).

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