Question about 2001 Jeep Cherokee

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2001 jeep cherokee has a p1494 code and a p0301 code seems to be running fine but want pass emissions

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0301 is cyclinder 1 miss fire,check coil pack and spark plug,plug first,1494 is the fan relay,It's in the right front of the engine compartment. Kind of behind and below the RF headlamp and in front of and below the fuse box.
Easy to replace, just unplug it and plug the new one in.
The relay is the most common cause for that code with a no fan operation condition, we see it all the time.

Posted on Jan 31, 2010

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P0301 (M) CYLINDER #1 MISFIRE Misfire detected in cylinder #1. P1494-LEAK DETECTION PUMP SW OR MECHANICAL FAULT


POSSIBLE CAUSES
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
LDP SWITCH SENSE CIRCUIT SHORTED TO GROUND
WIRING HARNESS INTERMITTENT
LDP VACUUM SUPPLY
FAULTY LEAK DETECTION PUMP
LDP SWITCH SENSE CIRCUIT OPEN
POWERTRAIN CONTROL MODULE

Posted on Jan 31, 2010

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Que significa codigo p1494


P1494 Leak detection pump pressure switch or mechanical fault

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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: http://engine-codes.com/p1494_jeep.html#ixzz2JDPIwqxm

Jan 27, 2013 | 2001 Jeep Grand Cherokee

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2001 grand cherokee misfires


Contact the dealer for a possible software update to cure this issue.

Sep 10, 2012 | 2001 Jeep Grand Cherokee

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2001 jeep grand Cherokee....code po443. What should I look for? Can I still drive it with this code until i fix it?


P0443 is for EVAP Purge Solenoid Circuit.
You can still drive it, but it'll cause emission related problems and you won't be able to pass emissions.
To replace it, it's under the hood, drivers side, near the rear corner and is shaped like a little cylinder. Fairly easy to go to a local parts store and replace yourself.

Apr 21, 2012 | 2001 Jeep Grand Cherokee

1 Answer

P1494 code engine light on


Leak Detection Pump Switch or Mechanical Fault is P1494, Iit is an evaporative emissions device that is used to pressurize. It is located behind the drivers headlight in the engine compartment. May be loose wiring or faulty sensor. Try resetting it or the battery after inspection and see if it continues

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What does the code P1494 means on my 99 jeep grand cherokee


LEAK DETECTION PUMP SYSTEMS (P1494, P0442, P0455, P0456),

Jun 10, 2010 | 2001 Jeep Grand Cherokee

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My engine light is on and the 2 codes that came up were P0740 and P1494


740 is transmission solenoid #3 failure

p1494 is a leak detection pump

Feb 24, 2010 | 2001 Jeep Cherokee

2 Answers

Engine light on with code 1494runs ok for now but light want stay off when i have it taken off, was told it was sensor to motor, but that there was four different ones and they don't know which one it...


P1494 means Leak Detection Pump Switch or Mechanical Fault - This code appears when there's an issue with the EVAP System (fuel tank fumes) This can be caused by a improperly secured gas cap, faulty gas cap, crack in the vacuum line, etc.

Sep 17, 2009 | 2001 Jeep Grand Cherokee

2 Answers

Trouble codes


P0441
Evaporative Emission System Incorrect Purge Flow
P1494
Jeep: Leak detection pump pressure switch or mechanical fault
U either have a leaking fuel system or the pressure sensor at the gas tank is defective, I would replace the pressure sensor 1st.

Jul 02, 2009 | 2000 Jeep Cherokee

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