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Re: EVAP shows up on OBD 2, mechanic says it's the purge...
The canaster purge valve is on the intake manifold near the mian air intake its takeing gas fumes from the tank and sending them to be burned through the main fuel intake
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This DTC checks for undesired intake vacuum flow to the EVAP system. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system
OBD code P0442 Small EVAP leak detected you may need to check the EVAP canister under the vehicle and the purge valve as well check for cracks on the canister or the purge valve and check all the rubber hoses connected to them foe cracks or holes. If you find any damage parts replace them. P0455 which means a large EVAP leak is sometimes referred as the gas cap leak check your gas cap and secure it tight if you still have the code change the gas cap hope this helps after you find and fix the problems get the vehicle to a shop and they will use an OBD scan tool to clear the codes.
code p0440 refers to evaporative emission (EVAP)system malfunction===causes--hose connections--intake leak--EVAP canister purge valve. Check all hose connections and replace the canister purge valve.. If you can locate the unit you should be able to replace it yourself
The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank. The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set. You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car. A mechanic would perform a smoke test to look for leaks.
Hello! Here is the diagram you requested...#5 is the Pressure Control Valve (Purge Valve)... (1)Throttle Body
(2)EVAP Solenoid Valve
(3)EVAP Vacuum
Switch
(4)EVAP Canister
(5)EVAP Pressure Control Valve
(6)Floating Roll-Over Valve
(7)Fuel Tank Guru.Saailer
DTC P1455 - Substantial Leak or Blockage in Evaporative Emission Control
System 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). Check this possible causes: 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
The EVAP service port is located in the EVAP purge pipe between the EVAP
purge solenoid and the EVAP canister. The service port is identified by
a green colored cap.
Fig. Showing location of (1) Evaporative Emissions (EVAP) Canister
Purge Solenoid and (2) Exhaust Gas Recirculation (EGR) Valve
Fig. EVAP Purge valve solenoid (3) mounting bolt (2) and insulator
(1) on 2000-2005 4.8L, 5.3L, 6.0L Engines
if your obd2 scanner fits the connection you have obd2, obd1 connector is way differnt.
your code p1443 Control System Canister Purge Valve (Mechanical) Malfunction Monitors the fuel vapor flow between the engine intake manifold and the EVAP canister. The system failure occurs when a leak or blockage between the intake manifold, the EVAP canister purge valve and the EVAP canister is detected by the PCM. l Pinched, blocked or plugged fuel vapor tubes/hoses (except between fuel tank and EVAP canister) l Damaged EVAP canister l Disconnected, cracked or cut fuel vapor tubes/hoses (except between fuel tank and EVAP canister) l Damaged EVAP canister purge valve Check for audible vacuum noise in the engine compartment or significant fuel odor in the engine compartment or near the EVAP canister.
This link has all the codes you need. http://rockledge.home.comcast.net/~rockledge/RangerPictureGallery/DTCs.pdf
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