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1997 Conti - Sets Code P0455
- Thread starter budpytko
- Start date
The evap system is HUGE on newer vehicles. Here's what AllData says it could be and where to go Bud:
HX44 - DTC P0455: Visual Inspection For Substantial Evaporative Emission System Leaks
Continuous Memory Diagnostic Trouble Code (DTC) P0455 indicates that the Evaporative Emission (EVAP) control system detected a large leak or no purge flow. Possible causes:
After market parts and accessories nonconforming to the EVAP system specifications.
Damaged, missing or improperly installed fuel filler cap.
Blockage in fuel vapor hoses/tubes (EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube) in EVAP system.
Disconnected or cracked fuel vapor hoses/tubes in EVAP system.
EVAP canister purge valve stuck closed.
Canister vent (CV) solenoid stuck open.
Fuel tank pressure (FTP) sensor malfunction.
EVAP canister leaking.
Fuel vapor control valve tube assembly blocked.
Fuel vapor vent valve assembly blocked.
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 to perform the following step, Go to the Powertrain/Engine Group, Evaporative Emissions Section in the Workshop Manual for removal and installation procedures.
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 CONNECT or REPLACE fuel vapor hoses/tubes as required. REPLACE damaged EVAP system components as necessary. REFER to the Powertrain/Engine Group, Evaporative Emissions Section in the Workshop Manual for the removal and installation instructions of 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. GO to HX45.
NO GO to HX45.
HX45 - Check For Evaporative Emission System Leaks
NOTE: When performing a check 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 make sure that the solenoid properly closes.
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 20).
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 20) and pass the leak test?
YES GO to HX46.
NO REMOVE the EVAP System Leak Tester from the evaporative test port and REINSTALL the test port cap. GO to HX50.
HX46 - Blockage Check For EVAP Canister-CV Solenoid Assembly
Key on, engine off
Close CV solenoid by accessing Output Test Mode on the scan tool.
Pressurize the EVAP system to 3.48 kPa (14 in-H 20).
De-energize the CV solenoid with the scan tool.
Does the pressure on the EVAP system drop rapidly (quickly) to zero?
YES GO to HX48.
NO GO to HX47.
HX47 - Check For Blockage Between EVAP Canister Purge Valve And EVAP Canister
NOTE: Remove the EVAP canister-CV solenoid assembly if it is not accessible to perform the following step.
Disconnect and plug the EVAP canister purge outlet tube (between EVAP canister purge valve and EVAP canister) at the EVAP canister.
Pressurize the EVAP system to 3.48 kPa (14 in-H 20).
Remove the plug from the EVAP canister purge outlet tube.
Does the pressure on the EVAP system drop rapidly (quickly) to zero?
YES DIAGNOSE Hiss When Opening Fuel Cap condition. Then, REPEAT Pinpoint Test Step HX46 to VERIFY a blockage no longer exists. Afterwards, GO to HX48.
NO REMOVE blockage or contamination from the EVAP canister purge outlet tube. If necessary, REPLACE the tube. GO to HX46.
HX48 - Check For Blockage Between The EVAP Test Port And The Fuel Tank
Key on, engine off.
Close canister vent (CV) solenoid by accessing Output Test Mode on the scan tool.
Pressurize the EVAP system to 3.48 kPa (14 in-H 20) at evaporative test port.
Remove the fuel filler cap.
Does the pressure on the EVAP system drop to zero?
YES LEAVE fuel filler cap off. GO to HX56.
NO REMOVE EVAP System Leak Tester equipment from evaporative test port. REINSTALL test port cap. GO to HX49.
HX49 - Check For Blockage Between Fuel Tank And EVAP Canister Tube
NOTE: Remove the EVAP canister-CV solenoid assembly if it is not accessible to perform the following step.
Key on, engine off.
Install the EVAP System Leak Tester at the fuel filler pipe.
Remove and plug the EVAP canister tube (from the fuel tank) at the fuel vapor line tee fitting between the EVAP canister purge valve and EVAP canister (or at the F-fitting on the EVAP canister).
Pressurize the EVAP system to 3.48 kPa (14 in-H 20) at fuel filler pipe.
Remove the plug from the EVAP canister tube.
Does the pressure on the EVAP system drop?
YES REMOVE EVAP System Leak Tester from fuel filler pipe. RECONNECT EVAP canister tube. GO to HX56.
NO DIAGNOSE Hiss When Opening Fuel Cap condition. Then, REPEAT Pinpoint Test Step HX48 to VERIFY a blockage no longer exists. LEAVE fuel filler cap off. GO to HX56.
HX50 - Check For Large Leaks At Fuel Filler Cap And Evaporative Test Port
Install the EVAP System Leak Tester at the fuel filler pipe.
Follow the instructions that come with the EVAP System Leak Tester kit to perform TESTING AT FILLER NECK.
Access the ultra-sonic detector from the test kit.
Key on, engine off.
Close canister vent (CV) solenoid by accessing Output Test Mode on the scan tool.
Pressurize the EVAP system to 3.48 kPa (14 in-H 20).
Perform the EVAP system leak test.
Slowly pass the detector probe around the fuel filler cap and the evaporative test port.
Is an audible change around the fuel filler cap or evaporative test port causing EVAP system leak test to fail?
YES REPLACE fuel filler cap or evaporative test port. When the test port is part of the EVAP canister purge valve, REPLACE the valve. REPEAT Pinpoint Test Step HX5O to VERIFY repair.
For EVAP system passing the leak test:
REMOVE EVAP System Leak Tester from fuel filler pipe. RECONNECT and TIGHTEN fuel filler cap only one eighth turn so that cap initially clicks by sound or touch. PERFORM the Vehicle Preparation for Monitor Repair Verification Drive Cycle and RERUN Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle.
For EVAP system not passing the leak test:
REMOVE EVAP System Leak Tester from fuel filler pipe. RECONNECT and TIGHTEN fuel filler cap only one eighth turn so that cap initially clicks by sound or touch. GO to HX51.
NO REMOVE EVAP System Leak Tester from fuel filler pipe. RECONNECT and TIGHTEN fuel filler cap only one eighth turn so that cap initially clicks by sound or touch. GO to HX51.
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Looks harder then it is. Main thing to check is the evaporative hoses. The big ones from the tank and any charcoal canister ones. LOok at all the hard plastic lines to the engine as well. Something came unplugged or maybe a mouse chewed through it. This code comes up a lot when people cut the fill tune to siphon your gas.
Looks harder then it is. Main thing to check is the evaporative hoses. The big ones from the tank and any charcoal canister ones. LOok at all the hard plastic lines to the engine as well. Something came unplugged or maybe a mouse chewed through it. This code comes up a lot when people cut the fill tune to siphon your gas.