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AzSun 09-19-2006 08:36 PM

Leak Detection Pump P1495 LDP
Has anyone else had this trouble code and what was the fix? I have a 1999 GC Laredo. I checked the fuses with a light probe, they are good. Dealership said it was a harness prob and $600 for the part and another $400 to install. I think thats a scam. I wish I had schematics. Anyone else have the same trouble?

kentman 09-19-2006 11:42 PM

I had this code before on my ZJ. I took the pump apart and cleaned out the filter. I reassembled, cleared the code, and it has never come back in over a year.

Double E 09-20-2006 01:24 PM

Kentman, exactly what pump is the error referring to?


Arkansas_WJ 09-20-2006 01:31 PM

P1495 (M)
Leak Detection Pump Solenoid Circuit
An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit.

Double E 09-20-2006 02:59 PM

Yeah the additional code data is great ...however, I think the code information is not real specific and was hoping Kentman (or another with practical data) could elaborate.

Where is this pump, what does it do...detect leaks? ...of what?

The filter that may actually be at issue...what is it for and made of? How does it get cleaned?

The error means it found a leak ...or that it is no longer working, disconnected...etc.?

Thanks again in advance....

kentman 09-21-2006 01:24 AM

Since you have a WJ, and I have a ZJ, things are probably a little different. However, the general components should be roughly the same.

Below is a photo of the pump and filter for the ZJ.

I believe that the leak detection system is looking for leaks in gas vapor. Gas vapor leaks are not environmentally friendly.

The first thing that I would do is verify that your gas cap is on good and tight. Reset the code (either with a code reader or disconnection of the battery). If the code comes back after checking the cap, then you may want to look at the filter and the pump. They are pretty simple on the ZJ. I just washed the filter out with water. I took the pump apart and made sure that there were no parts that looked bound or broke. I reassembled the pump and ensured that all of the vapor lines were attached properly.

Also check that the electrical connections are good and free of debris.

After doing this and then clearing the code, the code never came back.

The filter looks just like a K&N type cone filter, only smaller.

The error means that there is something wrong with the leak detection system and not necessarily that there is a leak. If the system is not working, then you do not know whether you have a leak or not.

Tinker with it and see if you can find what is setting the code off. My tinkering resulted in the code disappearing permanently.

Talk to you later.

Double E 09-21-2006 07:06 AM

Nice work Kentman. Thanks!!!

AzSun 09-22-2006 06:05 PM

Thanks Kentman! This is great info. I will try this during the weekend and post how it turned out. I agree this code, P1495, means the pump cannot work for whatever reason and therefore a leak in the system cannot be detected. I think code P1494 is the one for a faulty gas cap or other leak in the evaporator system.

Jarheadsjeep 09-23-2006 06:41 AM

That's some good info Kentman!!!.....How's the troll hunting going?

Samuel2002 09-24-2006 11:14 PM

On my WJ the hose from the filter to the pump dry rotted and gave me the same code. I replaced the hose and erased the code, and it never came back.

Might want to inspect the hoses too while your working on it.

Good luck!

Bubba3200 11-05-2010 06:00 PM

On a WJ is the location behind the left rear wheel well??

particalzman 06-28-2013 03:48 PM

Thanks Kentman!!! You rock I hadn't found enough information to start to track down the problem. For me what was wrong was that the small ridged vacuum line that runs from the intake straight down from the throttle. It has two small 90 vacuum nipples one one each end. The one that hooks to the engine had been getting worse and worse it got loose enough it popped off a time or two when I started it so replaced. You have to either go to dealer or the Help section at your local parts store. It was the 90 elbow at the bottom right behind the headlight on the drivers side. It was almost none existent and was not even hooked up. I took the new one off the engine and moved it down. FYI I forced the fresh air intake off without taking the air box loose. So if you have this code, and your elbow on the engine is bad I would plan on checking the second one too.

Thanks JEEPForum and all you jeepsters for all your info, input, and expertise!

Tumbleweed1954 05-20-2015 08:33 AM

2000 GC~ Had the P1494 light and a vacuum line had come of the intake manifold do to a dry rotted 90 degree elbow. Thanks for the insight guys!

kg6mov 05-20-2015 08:41 AM

Hey, this (ancient, dead) thread is from a time when the ZJ and WJ forums were one and the same. They have since been split off and the forum for the WJ (99-04 Grand Cherokee) forum is now here:

You would be best posting a new thread there as more WJ guys will see it. If you're lucky a mod may move this thread but we don't get a lot of mods around here.

Tumbleweed1954 05-21-2015 08:52 AM

Thanks, I didn't know :drool:

The time now is 06:55 PM.

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