Question about 1999 Jeep Grand Cherokee

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1999 jeep grand cherokee, error code 1494

1999 jeep grand cherokee, code 1494, replaced the leak detection sw. still getting the 1494 error code. What else could it be?

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  • 2 more comments 
  • Anonymous Mar 16, 2014

    engine shakes

  • Anonymous Mar 19, 2014

    Are these major or minor problems on my truck

  • Anonymous Mar 25, 2014

    engine lite on, p 1494 code how to fix

  • Anonymous Mar 25, 2014

    p1494 code how to fix



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Hi im pete ill try and help code 1494 is fuel sending unit dection fuel pump ,<ldp>. pressure switch hope this helps

Posted on Nov 19, 2009

  • katr601 Nov 18, 2011

    thank you i hope it does to lol



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Que significa codigo p1494

P1494 Leak detection pump pressure switch or mechanical fault

Jul 01, 2014 | 1999 Jeep Grand Cherokee

1 Answer

I have to error code with my jeep grand Cherokee Laredo 1999 the code are 1491,1495,753,136

P1491 Rad Fan Control Relay Circuit An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.P1495 Leak Detection Pump Solenoid Circuit An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit.P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the overdrive solenoid control circuit or Trans Relay Circuit in JTEC RE transmissions. Was MIL code 45. P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the transmission 2-4 shift solenoid circuit (4-speed auto. trans. only).P0136 (M) 1/2 O2 Sensor Heater Circuit Malfunction Oxygen sensor heater element malfunction.

Aside from getting into an accident and having your wiring harness severely damaged, the other likely suspect is your PCM. These codes are not related to each other and indicate a much larger problem.

Nov 02, 2013 | 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

I need to know what the fault code 1494 is it's not in my booklet that came with my scanner

This is a code for the leak detection pump and you will not notice a difference in the way the vehicle runs as this is just a vapor leak for the fuel system (emissions component) so has no effect on how it runs. Normally when getting this code the leak detection pump needs replaced.

Feel free to contact us in this link if you need additional details about DTC Jeep Fault Codes.

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Oct 27, 2011 | 2001 Jeep Grand 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

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

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

1 Answer


it may not be the leak detection pump..what codes did it show...a cracked hose going to the pump..the purge solenoid or the fuel pump can cause a leak

Nov 13, 2008 | 1999 Jeep Grand Cherokee

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