Question about 2000 Jeep Grand Cherokee

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OBDI 11 ERROR CODE P1494 EVAP leak detection pump pressure switch condition

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What is a leak detection pump switch or evap

Posted on Jun 15, 2009

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This is gonna blow your mind: I had the same problem with my 02 Chev Blazer and braced myself for an awesomely expensive fix. I kept getting the same response from the experts, though: "you WILL NOT get an evap failure - did you forget to close your gas cap?"

Buy a new gas cap, then run your Jeep for a week or so. The air in your fuel system should work itself out and kill the check engine light.

Posted on Dec 12, 2008

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P1494 and p0340 codes on pt cruiser


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.

Jul 31, 2014 | Chrysler PT Cruiser Cars & Trucks

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Error code p1494


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

Jul 29, 2014 | 2000 Chrysler Grand Voyager

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Jeep grand cherokee p0155 code p1494


For the P0155 code, check the fuse for the O2 heater circuit.
The P1494 has to do with the EVAP leak detection pump pressure switch. Or the switch is faulty, or there is a large leak. Do you hear any hissing sounds under the jeep?

Oct 21, 2013 | 2004 Jeep Grand Cherokee

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LDP vacuum hose


P1494 Definition Evap leak detection pump pressure switch condition

Explanation ECM detected the leak

Apr 10, 2013 | 1999 Jeep Cherokee 4WD

1 Answer

Town and county van with errors codes P 0300, P 0301, P 1494, P 1495 ???


P0300 - generic misfire.
P0301 - misfire at cylinder 1 = the spark was not generated at some time at cylinder 1
P1494 - Evap Leak Detection pump pressure switch condition = the ECM detected the leak detection pump switch did not change after the solenoid was energized
P1495 - leak detection pump solenoid circuit = the electrical circuit that commands the solenoid of the pump is interrupted
You need to check the wiring to the solenoid and the solenoid itself, located under the driver's side in the cast cradle under the steering gear. A good expertise of car electrics is required for that, you will need a good repair shop.

Jun 13, 2011 | 2003 Chrysler Town & Country

1 Answer

I have a 2002 jeep liberty limited 3.7 code p1494 how to fix it and where is it


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.

Sep 17, 2010 | 2002 Jeep Liberty

2 Answers

P1494


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).

Sep 08, 2010 | Dodge Dakota Cars & Trucks

1 Answer

Check engine code P1494???manufacture control auxiliary emission control


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

Oct 07, 2009 | 2003 Jeep Grand Cherokee

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