WJ Help- P1495 LDP Solenoid Circuit - JeepForum.com
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post #1 of 7 Old 01-08-2009, 02:15 PM Thread Starter
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WJ Help- P1495 LDP Solenoid Circuit

I just had some work done on my '02 Jeep Grand Cherokee. They repaired two pins in the socket of my headlight wiring harness, repaired a cracked hose & my gas cap that was causing a very small, small and large evap leak. While I was paying, they told me they checked the codes again and nothing was thrown. I made it to 94.5 miles before the CEL came on. At 114.5 miles it went out. I thought maybe it was still clearing the codes? I can't recall the exact mileage of when it popped back on, maybe somewhere around 134ish. Advanced Auto Parts read only a P1495 and after some research I found out it's a Leak Detection Pump Solenoid Circuit (An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit.) Has anyone else had experience with this? And is this in any way related to the previous evap leaks? Thanks!

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post #2 of 7 Old 01-08-2009, 02:25 PM
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hopefully someone with actuall experience in this area will chime in...

in the mean time, this is what the FSM says... not much help

SECTION 1 - P1495 Leak Detection Pump
Solenoid Circuit- When the ignition key is turned
to 9ON9, the LDP diaphragm should be in the down
position and the LDP reed switch should be closed. If
the EVAP system has residual pressure, the LDP diaphragm
may be up. This could result in the LDP reed
switch being open when the key is turned to 9ON9
and a P1494 fault could be set because the PCM is
expecting the reed switch to be closed.
After the key is turned 9ON9, the PCM immediately
tests the LDP solenoid circuit for electrical
faults. If a fault is detected, DTC P1495 will set, the
MIL will illuminate, and the remaining EVAP Leak
Detection Test is canceled.

i would deffinately take it back to them and explain the situation... it's possible the LDP is bad, but i'm betting that perhaps while fixing everything else they knocked a vacuum line or the electrical fitting nearly loose and after a bit of driving it came undone? or they didn't hook something back up correctly?
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post #3 of 7 Old 01-09-2009, 09:45 AM Thread Starter
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I thought it was something on their end too. Of course they disagreed. Thanks for getting back to me. I took it there this morning and the light turned off again?!
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post #4 of 7 Old 01-09-2009, 09:48 AM Thread Starter
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Can someone give me their opinion..

I drove it there for service this morning and of course the light is back out. So now my ride is inspected, but they want to know if I want to have them fix or look into the issue..and I'm going back and forth on it. I really don't want it to be an issue in the future, but am being told it's an emissions thing and shouldn't cause any...any thoughts?
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post #5 of 7 Old 01-09-2009, 11:04 AM Thread Starter
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I decided to leave it for now. If/When the CEL comes on again, I'll get it fixed. It was going to be 250-300 for the LDP and then they wanted to "poke around" to find the problem (have to keep their meter running..) Here's a link I found in case anyone else needs help with this:

Jeep Cherokee Leak Detection Pump
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post #6 of 7 Old 01-10-2009, 12:48 PM
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My money is on a crack in the lines between the tank and the pump.

'06 XK Limited, 5.7L, QD II, Black, 170K
'02 WJ Overland, 4.7L HO, QD, Inferno Red, 130K
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post #7 of 7 Old 02-16-2012, 02:41 PM
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'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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