What does the error code P1494 leak detection pump mean and what do I need to do to fix it

didnt specify so check these links for assistance p1494 code what exactly is and where is the part located P1494 EVAP Leak Detection Pump Switch or Mechanical Fault Trouble Code P1494

p1494 = "Evap leak detection pump pressure switch"
p0340 = "Camshaft position sensor"

You have two unrelated problems. The computer doesn't like your cam position sensor - replace that sensor. There also seems to be a problem with your evac pump, which may be a lot harder to track down; you may have a problem with the pressure switch or with a vacuum leak or vent leak somewhere within the fuel-tank-to-charcoal-canister-to-engine lines. Try replacing that switch first. If that doesn't fix the problem, then you'll need a hose routing diagram - with it, trace the vacuum lines and vent lines, looking for leaks or blockages.

P1494 Dodge - EVAP Leak Detection Pump Pressure Switch Condition
Read more:http://engine-codes.com/p1494_dodge.html#ixzz38oidVNLQ

P1494 Leak detection pump pressure switch or mechanical fault

P1494 code is a leak detection pump switch or mechanical fault, leak detection pump switch does not respond to input. The leak detection pump (if equipped) is located under the air filter housing on models through 2001. Check if the vapor and vacuum lines are securely connected to the leak detection pump or a diagonstic trouble code my be set like this. The leak detection pump switch may be bad and need replaced.

p1494
Leak detection pump pressure switch or meahanical fault
could be a leak in the evap system.hard to tract down becuse a large leak ishole small as 0.040-inch.

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
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.

NOTE: VERIFY ALL RELATED SUPPLY VACUUM LINE ROUTINGS FOR PINCHES, KINKS, OR DISCONNECTION'S BEFORE REPLACING LDP SYSTEM COMPONENTS.

Hope helps (remember rated and comment this).

Definition of error code
Evap leak detection pump pressure switch condition
Explanation

ECM detected the leak detection pump switch did change after solenoid was energized

Probable Cause
1.-Leak detection pump defective
2.-Open or shorted circuit condition
3. Solenoid defective

P1494 Leak detection pump pressure or mechanical fault, hope this helps

The code refers to the leak detection pump that is part of the gasoline vapor control system which is for pollution minimization. It says either that the pump switch or mechanical operation is faulty. I had this happen on a 2000 Dodge Dakota and a replacement Gas Cap fixed the problem. A faulty gas cap seal can also cause this.

Good luck