Question about 2003 Jeep Grand Cherokee Limited

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Evap leak test

My jeep is presenting this error in the reader. could you help please

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No fault code set? Try the key dance: ignition switch off/run three times and leave in run at third time. Odometer shows Done when no faults, or a fault code(s).
The evap test runs automatically and checks for leaks in the evaporative control system.

Posted on May 28, 2014

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SOURCE: 2004 jeep grand cherokee codep0244 small evap leak

use carb cleaner and waft all vacuum lines and areas near evap can and when engine rpm changes you are close ...:) good luck

Posted on Oct 31, 2008

  • 236 Answers

SOURCE: 03 Jeep Liberty - Evap system small leak

how about the filler neck. just had to replace mine and now its fine

Posted on Jun 18, 2009

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SOURCE: Jeep comes up with EVAP Emission Control System code- please help

YES A CAP FROM THE DEALER WILL MOST LIKELY SOLVE THIS ISSUE...SOME OF THE AFTERMARKET CAPS ARE NOT MADE TO THE PROPER SPECS TO MAINTAIN PROPER PRESSURE/VACUUM ON THE SYSTEM WHEN THE EVAP TEST BY THE COMPUTER OCCURS

Posted on Aug 31, 2009

Testimonial: "Thank you- I'll try that."

SOURCE: My 2001 Jeep has evap leak codes p0455 and p0442,

I do not know the codes but after a smoke test ,I would use the codes and a schematic to walk down and test every switch or valve in the EVAP System. A professional scanner would be nice,so you could command somethings on and off.

Posted on Mar 12, 2010

  • 4340 Answers

SOURCE: Have 2002 Jeep Grand Cherokee, Laredo, 2WD, 4.0

This job requries special training and tools, have a shop do it and avoid personal injury.

Odds of an evaporator are extremely slim. Get a shop to leak test, Usually seals, nor major components.

Posted on Jun 20, 2010

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1 Answer

Location of fuel vapor leak detection pump 2004 jeep wrangler


try posting why you ask this first
my guess, dash CEL glows, driving,
guess 2, you get it scanned and it shows a DTC error you forgot to tell here, then assume its a bad part, named per above.
why?
first is to get the gas cap tight ( or new)
and then push reset on the scan tool.
then see if the undisclosed, DTC errors, goes away.
this is first. all cars 1996 to NOW.

unless building a EVAP leak down test system is fun. or easy.?? or guessing all parts in the system? why"
see TJ jeep here
posted over 300 times, read the EVAP chapter.
EVAP means in simple terms is GAS tank VENTING and Collection system. its a smog reduction system.
2003 is free to read.
http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service
chapter 25 "emissions"
page 15 answers your question.

Dec 07, 2016 | 2004 Jeep Wrangler

2 Answers

Error codes p0442 and po445


Po442 is evap system leak
check intake and all vacuum hoses for leaks
check evap canister and purge valve
Po445 is evap canister purge valve short circuit
check wiring and connection

Apr 16, 2016 | 2002 Jeep Grand Cherokee Limited

2 Answers

Engine light came on hooked up the digital OBD two car reader and it says PO 456


Code 456 is for a small leak found in the EVAP system. It could be a faulty gas cap, or something else.

Jan 31, 2014 | 2004 Jeep Wrangler

1 Answer

What would it cost to replace the hoses on EVAP on 2003 Jeep Gr. Cherokee on canister


they can look cracked on the out side but not be leaking.You need to do a leak down test of your complete system.If your lite is coming on and you had it checked and it says small leak or large leak it is most likely the small vacume pump or diaphram in the evap system.they get stuck and just leak over time.my 2001 grand cherokee does this from time to time.I just went on ebay and bought the cheapest code reader i could find $20.00 and free ship.I just erase it when my check engine light comes on.

Feb 16, 2013 | Cars & Trucks

1 Answer

Have 2002 Jeep Grand Cherokee, Laredo, 2WD, 4.0 engine. Freon leaking out, can't see visual oil leak, but evap condensate water feels oily. Leak must be evap. How/Where do I find a good step by step...


This job requries special training and tools, have a shop do it and avoid personal injury.

Odds of an evaporator are extremely slim. Get a shop to leak test, Usually seals, nor major components.

Jun 20, 2010 | 2002 Jeep Grand Cherokee

2 Answers

My 2001 Jeep has evap leak codes p0455 and p0442, it has been smoke tested and there were no leaks found, but the codes are still there any ideas


I do not know the codes but after a smoke test ,I would use the codes and a schematic to walk down and test every switch or valve in the EVAP System. A professional scanner would be nice,so you could command somethings on and off.

Mar 12, 2010 | 2001 Jeep Grand Cherokee

2 Answers

PO456 code on 2002 Jeep Wrangler.Where do I start?


p0456 is ayoun evap fault honestly this is a job for a professional with the correct diagnostic equipment jsut from memory it is a vent control fault. if you have access to alldata or mitchel on demand you can get diagnostic steps for the proper diagnosis. unless you have the proper tools this is a job left to a good repair technician that you trust sorry i cant give you a straight answer but you will throw away money buy just replacing parts and hoping it fixes it, just food for thought if the code is cleared it will take time to come back the only way to conferm the repair is a evap self test that can be done with the adiquite scan tool

Nov 12, 2009 | 2002 Jeep Wrangler

1 Answer

Jeep comes up with EVAP Emission Control System code- please help


YES A CAP FROM THE DEALER WILL MOST LIKELY SOLVE THIS ISSUE...SOME OF THE AFTERMARKET CAPS ARE NOT MADE TO THE PROPER SPECS TO MAINTAIN PROPER PRESSURE/VACUUM ON THE SYSTEM WHEN THE EVAP TEST BY THE COMPUTER OCCURS

Aug 31, 2009 | 1991 Jeep Wrangler

1 Answer

03 Jeep Liberty - Evap system small leak


how about the filler neck. just had to replace mine and now its fine

Jun 17, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Check engine light is on for emission evaporator failure-large


P0455 - EVAP Control System Leak Detected (No Purge Flow or Large Leak) The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).
  • After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
  • Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube
  • EVAP canister purge valve stuck closed
  • Damaged EVAP canister
  • Damaged or missing fuel filler cap
  • Insufficient fuel filler cap installation
  • Loose fuel vapor hose/tube connections to EVAP system components
  • Blockages or restrictions in fuel vapor hoses/tubes (items also listed under disconnections or cracks)
  • Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked
  • Canister vent (CV) solenoid stuck open
  • Mechanically inoperative fuel tank pressure (FTP) sensor
Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank. ----------------------------------------------------------------------------- HX43 DTC P0457: CHECK FOR MISSING OR LEAKING FUEL FILLER CAP
  • Check for missing fuel filler cap.
  • Check for loose fuel filler cap.
  • Check for possible cross-thread fuel filler cap condition.
Is a fault present concerning the proper installation of the fuel filler cap? Yes No REPLACE cross-threaded or damaged fuel filler cap. RECONNECT and TIGHTEN the fuel filler cap only one eighth turn so that the cap initially clicks by sound or touch. CLEAR Continuous Memory DTCs. COMPLETE an Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle (refer to Section 2 , Drive Cycles). RERUN Quick Test . If DTC P0455 or P0457 is present, Go to HX44 . CLEAR Continuous Memory DTCs. COMPLETE an Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle (refer to Section 2 , Drive Cycles). RERUN Quick Test .

For DTC P0455 still present: Go to HX44 .

Otherwise, INFORM the vehicle owner that it is important and necessary to immediately install the fuel filler cap after every refueling event. HX44 DTC P0455: VISUAL INSPECTION FOR SUBSTANTIAL EVAPORATIVE EMISSION SYSTEM LEAKS
  • Check for missing fuel filler cap. If the cap is loose DO NOT DISTURB EVAP system.
  • Verify that both the input port vacuum hose and EVAP return tube are attached to the EVAP canister purge valve. Note: If the EVAP canister-CV solenoid assembly is not accessible during this pinpoint test step, GO to Evaporative Emissions, Section 303-13 in the Workshop Manual for removal and installation instructions.
  • Verify that the CV solenoid is properly seated on the EVAP canister (if possible).
  • Visually inspect for disconnected or cracked fuel vapor hoses/tubes between the intake manifold, the EVAP canister purge valve, the EVAP canister, the fuel vapor vent valve assembly and if applicable the fuel vapor control valve tube assembly.
  • Check for damage to the fuel filler pipe and the fuel tank.
Is a fault indicated? Yes No CONNECT or REPLACE fuel vapor hoses/tubes as required. REPLACE damaged EVAP system components (fuel filler pipe, fuel vapor vent valve assembly, fuel vapor control valve tube assembly, EVAP canister purge valve, FTP sensor and EVAP canister-CV solenoid assembly) as necessary. REFER to Evaporative Emissions, Section 303-13 in the Workshop Manual for removal and installation instructions. GO to HX45 . GO to HX45 . HX45 DTC P1443 and P0455: CHECK FOR EVAPORATIVE EMISSION SYSTEM LEAKS
    Note: When checking for leaks or blockages in the EVAP system, energize (close) the canister vent (CV) solenoid through the scan tool for a maximum of nine minutes per pinpoint test step. Then de-energize the CV solenoid prior to performing the subsequent pinpoint test step. This is done to assure proper closing of the solenoid.
  • Disconnect and plug the EVAP return tube (EVAP canister purge valve to intake manifold) at the intake manifold vacuum source.
  • Connect scan tool.
  • Key on, engine off.
  • Access VPWR PID. If the voltage is not 12 volts or greater, GO to HX61 .
  • Locate evaporative test port [marked EVAPORATIVE SERVICE PORT DO NOT USE UNREGULATED PRESSURE ABOVE 6.89 kPa (1 PSI)] near EVAP canister purge valve or EVAP canister.
  • If vehicle is not equipped with the evaporative test port, GO to HX50 .
  • Install the Rotunda Evaporative Emission System Leak Tester 310-F007 (134-00056) or equivalent at the evaporative test port.
  • Close CV solenoid by accessing Output Test Mode on the scan tool.
  • Select ALL OFF mode and push START button.
  • Regulate the nitrogen or argon gas pressure on the tester to 3.48 kPa (14 in-H 2 O).
  • Follow the instructions that come with the EVAP System Leak Tester and pressurize the EVAP system.
  • Perform the EVAP system leak test.
Does the pressure on the EVAP system stay above 1.99 kPa (8 in-H 2 O) and pass the leak test? Yes No GO to HX46 . REMOVE the EVAP System Leak Tester from the evaporative test port and REINSTALL the test port cap. GO to HX50 .

Apr 15, 2009 | 1999 Lincoln Town Car

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