Question about 1999 Jeep Grand Cherokee

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1999 Jeep Grand Cherokee.....My check engine light came on, I took it to Auto Zone and they said it was code P1494. What is that and how hard is it to fix?

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Hi ,
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. According to a Chrysler manual I have, you would find the pump, probably on the underside of the vehicle by tracing the hoses related to the vapor recovery tank that may be in the right front corner of the engine compartment (I don't know Jeep designs) and then check to see if the pump starts when you turn the ignition to the run position when the vehicle is cold. Then remove the vacuum hose side of the pump and see if it draws a vacuum. If it does, then the vacuum-detecting switch that detects that the pump operation is OK may be faulty. If the pump doesn't start or doesn't draw a vacuum then the power to the pump, the pump itself, or the vacuum line may be leaky. Finally, the powertrain controller could be at fault.
In any case, that is where the issue is, and it should not be a major issue if it is handled by a knowledgeable mechanic. But you could check it over yourself if you are so inclined. p.s. your best bet is to take it to a jeep dealer to get it fixed hope this helps please dont forget to rate my solution

Posted on Sep 30, 2010

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The code refers to the leak detion pump (LDP) theres a switch that turns this pump on right after a cold start, this code says that the computer has determined that this pump did'nt turn on. or if it did it's notconnected to the fuel system and the pump can't be determined to be running. leaving the gas cap loose or off could also se this code. Never try to fix this kind of code tillyou see this problem more than once. Clear this code and drive the car, if it doesn't come back don't worry about it. the switch may have just hung up or you did'nt get the fuel cap on good.

Posted on Sep 30, 2010

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P1494. Leak Detection Pump Switch or Mechanical Fault.

About this DTC I have ona answer in this link, visit it: fixya.com/code_p1494

Hope this helps to solve it (remember to rate and comment this help).

Posted on Sep 30, 2010

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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?

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My check engine light is on - Took it to auto zone, and they said it is error P1494. What is this and how do you fix it. Is it major?


P1494 is the code for the leak detection pump and or system, which is part of the early evaporative emission system. (Fuel tank fumes)

It's there to allow the computer to run an integrity test of the fuel tank, lines and carbon canister's ability to contain all of the fumes coming from the tank and all line associated with the system.

The code could be set for a number of reasons such as a faulty gas cap, cracked vacuum lines, solenoids & vent valves stuck to the pump itself.
It can be a very difficult fault to cure being it doesn't take a very big leak anywhere in the system to set the code and that's if it's a leak and not an electrical or mechanical fault.

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You'll need an OBD I code reader or similar reader to pull the codes. You can purchase from autozone or online.

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Codes for durango p0443-0753-1765-1494


danbalue, a code P1765 means Transmission 12V Supply Relay Control Conditions and P1494 means EVAP LDP Pressure Switch Fault Conditions.

I found info on the following codes:
P0443 - http://www.obd-codes.com/p0443
P1494 - http://www.check-engine-light.com/dodge

Good luck.

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Check engine light stays on could I need a new gas cap 2002 grand cherokee will auto zone have it


WELL I WOULD FIND OUT WHAT THE CODE IS AND THAT MAY LEED YOU TO WHAT IS WRONG WITH JEEP I THINK YOU CAN GO TO AUTO ZONE AND THEY WILL READ CODE FOR FREE IF IT IS SMALL EVAP LEAK YOU COULD TRY GAS CAP BUT IF IT IS ANY OTHER CODE ITS NOT GAS CAP

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