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Old 03-02-2012, 06:27 PM   #1
Join Date: Feb 2012
Location: eastern side of Washington state, lots of sand and dry heat
Posts: 4
Code 1495 help

Hey jeepers, can anyone help me with this code, it indicates there is a problem with leak detection pump and or pressure switch malfunction on the solenoid circuit. What the heck does this mean? and where can i find this circuit? happened this week, started the wrangler with 4.0 engine early in the week and the start sound was just a little different...engine lite came on, did the dashlite diagnostic and nothing came up. Drove it to Autozone and got this code, drove home and the engine lite shut off...and it starts normal again...any ideas would be greatly appreciated. thanks. Its a 2000 model.

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Old 03-03-2012, 01:36 AM   #2
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Join Date: Feb 2011
Location: California/Nevada
Posts: 1,648
See if the code returns. Sometimes it is a one time glitch. Here is some info from the FSM:

The LDP is located in the engine compartment near the EVAP canister.

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

The Leak Detection Pump (LDP) is used only with
certain emission packages.
The LDP is a device used to detect a leak in the
evaporative system.
The pump contains a 3 port solenoid, a pump that
contains a switch, a spring loaded canister vent valve
seal, 2 check valves and a spring/diaphragm.
Immediately after a cold start, engine temperature
between 40°F and 86°F, the 3 port solenoid is briefly
energized. This initializes the pump by drawing air
into the pump cavity and also closes the vent seal.
During non-test test conditions, the vent seal is held
open by the pump diaphragm assembly which pushes
it open at the full travel position. The vent seal will
remain closed while the pump is cycling. This is due
to the operation of the 3 port solenoid which prevents
the diaphragm assembly from reaching full travel.
After the brief initialization period, the solenoid is
de-energized, allowing atmospheric pressure to enter
the pump cavity. This permits the spring to drive the
diaphragm which forces air out of the pump cavity
and into the vent system. When the solenoid is energized
and de-energized, the cycle is repeated creating
flow in typical diaphragm pump fashion. The pump
is controlled in 2 modes:


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Old 03-03-2012, 12:11 PM   #3
Join Date: Feb 2012
Location: eastern side of Washington state, lots of sand and dry heat
Posts: 4
ok, thanks very much for the info, really appreciate the help....
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