Question about 2000 Jeep Grand Cherokee

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2000Gran cherokee engine lite 1494 cod leak detection pump pressure switch or mechaical fault location of presure switch

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The quick fix is to clean and reconnect all the electrical connector to the engine.

Pay close attention to the EGR lift sensor and the purge valve connector on the driver side fender.

I recommend CRC Mass Air Flow sensor cleaner (at major auto part store) or electrical parts cleaner (at Radio Shack).

After the cleaning then clear the code.

Fill up a full tank of Chevron to clean out the injectors.


If the same code returns then you will spend time on the EGR valve.

Carbon will built up over time and it will block the movement of the EGR valve and the EGR air passage.

Order a EGR base gasket before you start the job.

The easy route is to order a new EGR valve,but it can be clean if you have time. The air tube is a tough on. A vacuum clean can help to speed up the process.

After you put the valve and sensor then do a code reset.

This should fix you P1494 code problem.

Please post more information on the comment window,

Posted on Aug 31, 2009


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2 Answers

Que significa codigo p1494

P1494 Leak detection pump pressure switch or mechanical fault

Jul 01, 2014 | 1999 Jeep Grand Cherokee

1 Answer

What's your problem?1494

this is what I found for that code:Leak detection pump pressure switch or mechanical fault. I assume it's the fuel pump.

Jun 24, 2012 | 1999 Jeep Grand Cherokee

1 Answer

Engine light stays on code p1494

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.

Sep 27, 2011 | 2000 Jeep 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

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

My service engine soon light is on and I have been told the code is 1494. What does that mean?

P1494 is a Leak Detection Pump Switch or Mechanical Fault. 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). This is a problem with evaporative emissions system and should not affect drivability. If this was helpful please leave positive rating.

Nov 30, 2010 | 1999 Dodge Avenger

1 Answer

Code p 1494


The most common cause for this code to set is a failure of the switch inside the leak detection pump. When this occurs, the pump needs to be replaced. The LDP is located in the right-rear side of engine compartment.

Oct 13, 2010 | 2000 Jeep Cherokee

2 Answers

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

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.

Jan 31, 2010 | 2001 Jeep 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

1 Answer

Code 1494


When Monitored: Immediately after a cold start, with battery/ambient temperature between 40 deg. F and 90 deg. F and coolant temperature within 10 deg. F of battery/ambient.

Set Condition: The state of the switch does not change when the solenoid is energized.

This code sets when the LDP Switch does not close when the vacuum is let into the LDP. An evap leak will not set this code. First check the vacuum to the LDP. IF it is ok, you will need a wiring diagram to check the battery voltage, and the control wire, and the switch state wire to the LDP. If the wiring to the LDP is good, then the switch in the LDP is bad, and you replace the LDP. This is the case almost 100% of the time.

Good luck.

Aug 25, 2009 | 1999 Jeep Grand Cherokee

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