Question about 2001 Jeep Grand Cherokee

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The service light is on, the code I get is 1495 leak det. pump, which the vehicle does not have or is wired for one. Glen Mcduffie

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  • gmachawk Oct 01, 2009

    It is evident you did not read the problem very well, this vehicle does not have a LDP on it. It came from the factory with the service engine light removed. therefore I am not satisfied with the answer you gave me. I aquired the LDP with all the hardware and hoses. The wiring was located fastened to fender well which had to be rerouted. After completeing the instulation, it

    passed the NC inspection.



    Glen McDuffie

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What year make model and engine size (Liter) is this?

Posted on Oct 01, 2009

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1495 Leak Detection Pump (LDP) pressure switch problem - the solenoid circuit. The actual error is that seen above.

This fault will normally occur when the state of the switch does not change when the solenoid is energized.

This code sets when the LDP Switch does not close correctly when the vacuum is let into the LDP. First check the vacuum to the LDP. If this measures OK you will need to check the battery voltage, then the state and continuity of the control wire and the switch state wire to the LDP. If the wiring to the LDP is OK then you can safely assume that the LDP switch is faulty and needs to be replaced.


If for any reason you do not have this fitted then your computer is at fault. You can reset it by disconnecting the battery from the computer for 30 mins and then reconnecting it. If the fault persists in displaying then you will need to get the computer replaced.

Posted on Sep 24, 2009

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1 Answer

I rest the code with a scanner after installing the new pcm & ldp still code comes right back also smoke tested & no vissible leaks


That code deals with the leak detection pump , look for leaking hoses under the vehicle coming from the fuel tank , if rotten or torn replace , it can also be the leack detection pump itself which is mounted close to the tank or under the hood if under the hood it will have a black plastic line with a green screw on cap going to thr pump ,it doesnt matter if you cannot find leaks the leak detection pump could be shot and not operating .

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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.

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1999 Chrysler Sebring Convertible code P1495. I


Code 1495 = Leak Detection Pump Solenoid Circuit

Remove the connector from the solenoid (should be on the back wall, just to the drivers side of the air-hat). You will have the solenoid to check and the harness. What you want to measure is the voltage coming from the harness and the resistance of the solenoid.

Turn the key to the "ON" position but do not start the motor; the voltage at the connector should be at least 10V or more,.now, check the resistance of the solenoid (should be around 35 ohms).

Hope helps.

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Trouble code 1494 1495 1999 t&c 3.8


P1494
The code refers to the leak detection pump that is part of the gasoline vapor control system which is for pollution minimization. It says either that the pump switch or mechanical operation is faulty. According to a Chrysler manual I have, you would find the pump, probably on the underside of the vehicle by tracing the hoses related to the vapor recovery tank that may be in the right front corner of the engine compartment (I don't know Jeep designs) and then check to see if the pump starts when you turn the ignition to the run position when the vehicle is cold. Then remove the vacuum hose side of the pump and see if it draws a vacuum. If it does, then the vacuum-detecting switch that detects that the pump operation is OK may be faulty. If the pump doesn't start or doesn't draw a vacuum then the power to the pump, the pump itself, or the vacuum line may be leaky. Finally, the powertrain controller could be at fault.
In any case, that is where the issue is, and it should not be a major issue if it is handled by a knowledgeable mechanic. But you could check it over yourself if you are so inclined.
P1495
LEAK DETECTION PUMP DEFECTIVE/INOP
THE ROOT CAUSE HERE IS A DEFECTIVE EVAPORATIVE EMISSIONS LEAK DETECTION PUMP, IT PULLS A VACUUM ON THE GAS TANK TO CHECK FOR FUEL LEAKS. REPLACE IT.

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Leak detection pump solenoid circuit. Your best bet is to have a shop good with scan tool or dealer diagnose it & repair it. It's part of the evporative/emission control circuit.

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2001 dodge neon check engine lite is on code 1495 showing


P1495 Leak Detection Pump Solenoid Circuit Open Or Shorted
Code P1495 is for the LDP solenoid circuit. (LDP-Leak Detection Pump). This is a system that seals off the evaporative system of the car and then pressurizes it with the LDP. The computer looks to see how long it takes to pressurize the system, (depending on fuel level) and then determines if the system is leaking. Emissions regulations require this to cut down on fuel vapours from escaping to the atmosphere.You will likely have to get a dealer to diagnose this, unless you can find a shop that has a manual and DRB scan tool.

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