Question about 1999 Jeep Grand Cherokee

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  • DDuRocher Dec 29, 2008

    Hi Everyone! Just realized my inspection is due in 2 days and I started my Jeep up this morning to take it to be inspected and of course the great timing that it has threw a 1494 check engine light. It had a rough start last week; however, I just attributed it to the cold wet weather. It wasn't so much a rough start as it started right up, but it was "chuggy" and choppy - maybe a misfire? I immediately restarted and it was fine ... any idea on this? Back to my 1494 ... I re-tightened my gas cap since I know that is the most common problem and disconnected my battery ... the cel is gone now and after driving and restarting it hasn't come back. If it isn't this simple and I have to have repairs made ... how much am I looking at? I live in NYC and am a blonde female so I tend to notice that prices quoted to me are often WAY more then they should be, so I like to know a range before I go in! HELP : /

  • Anonymous Mar 19, 2014

    Is this something dat can be fixed at home and not in a shop



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It may not be the leak detection pump..what codes did it show...a cracked hose going to the pump..the purge solenoid or the fuel pump can cause a leak

Posted on Nov 13, 2008


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P 0301 was detected ? it does not want to pass smogg test

classic Fed. P0301 errors
misfire #1 cylinder.
sure it fails smog 3 ways.
the CEL glows, (fail) DTC stored, fail 2 and the exhaust gases are dirty.
hopeless yes.
the misfire is the deal. topic.
this error really means
Combustion is weak on #1 , nothing more.
causes are many , ill list a few. not guesses,
1: bad spark plug on #1, ever heard of a tune up?
2: low compression on #1
3: bad fueling on #1
4: water or oil leaks to #1
5: air leaks on #1 intake tube.
6: injector $1 weak or faulting, sticking or ? bad.

bad fueling #1 means too rich or 2 lean

there are tests (ASE books to read) for each class failure.

why not get it fixed.
or buy the tools and DIY.
its always a choice, unstated. desires.?

Sep 02, 2014 | 2005 Jeep Grand Cherokee

2 Answers

Que significa codigo p1494

P1494 Leak detection pump pressure switch or mechanical fault

Jul 01, 2014 | 1999 Jeep Grand Cherokee

1 Answer

I have to error code with my jeep grand Cherokee Laredo 1999 the code are 1491,1495,753,136

P1491 Rad Fan Control Relay Circuit An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.P1495 Leak Detection Pump Solenoid Circuit An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit.P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the overdrive solenoid control circuit or Trans Relay Circuit in JTEC RE transmissions. Was MIL code 45. P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the transmission 2-4 shift solenoid circuit (4-speed auto. trans. only).P0136 (M) 1/2 O2 Sensor Heater Circuit Malfunction Oxygen sensor heater element malfunction.

Aside from getting into an accident and having your wiring harness severely damaged, the other likely suspect is your PCM. These codes are not related to each other and indicate a much larger problem.

Nov 02, 2013 | 1999 Jeep Grand Cherokee

1 Answer

Code p1494 grand laredo cherokee 2001

Here is the definition.
You'll need a shop manual for the procedures.

P1494 JEEP Description The Evaporative emissions system is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, can allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage.

During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LD pump to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.
Read more:

Jan 27, 2013 | 2001 Jeep Grand Cherokee

1 Answer

What could the problem be! I just did a smog check and everything passed accept code 1494.

p-1494 is a Leak detection pump switch or mechanical fault within the EVAP system. The possible causes are; An intermittant bad connect in the wiring harness or at the EVAP pump. The EVAP pump is faulty, broken or disconnected vacuum hose within the EVAP system. This code can be very challenging, even to an expert.

Aug 18, 2011 | 2002 Jeep Grand Cherokee

3 Answers

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?

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

Sep 30, 2010 | 1999 Jeep Grand Cherokee

1 Answer

1999 jeep grand cherokee, error code 1494

hi im pete ill try and help code 1494 is fuel sending unit dection fuel pump ,<ldp>. pressure switch hope this helps

Nov 18, 2009 | 1999 Jeep Grand Cherokee

2 Answers

Replacing water pump on 2000 Jeep Grand Cherokee V6

i have a 2000 grand laredo jeep cherokee that is leaking fliud bad i think it the water pump how do i fix it ??

Jan 10, 2009 | 2000 Jeep Grand Cherokee

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