Evap emisson control system p0443 p0449 mod#10 vent vv/so/-mal po108p/d mod#10 map/baro circuit high input purge valve c

DTC P0449: Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Circuit/System Description
An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge solenoid valve. The engine control module (ECM) grounds the EVAP canister purge solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. The EVAP canister purge solenoid valve is pulse width modulated (PWM). A scan tool will display the amount of ON time as a percentage.
Battery voltage is supplied to the EVAP canister solenoid valve. The ECM grounds the EVAP canister vent solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. A scan tool will display the commanded state of the EVAP canister vent solenoid valve as ON or OFF.

P0449
Ignition ON, engine OFF, command the EVAP vent solenoid ON and OFF with a scan tool.
Listen for a click when the valve operates. Verify that both the ON, and the OFF states are commanded.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing
Ignition OFF, disconnect the harness connector at the EVAP canister purge or vent solenoid valve.
Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal A and ground.
? If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is open, test or replace the EVAP canister purge solenoid.
Connect a test lamp between the voltage supply circuit terminal A and the control circuit terminal B.
Command the EVAP canister purge solenoid valve to 50 percent with a scan tool, or the EVAP canister vent solenoid valve ON and OFF. The test lamp should respond to the command.
? If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
? If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, replace the appropriate solenoid valve.

This is how to test electrical circuit for the vent solenoid .

P0443 FORD - EVAP Purge Control Circuit Possible causes Faulty Evaporative Emission (EVAP) Purge Solenoid Control Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection What does this mean? When is the code detected? - An improper voltage signal is sent to ECM through the valve. Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) P0443 Ford Description The Evaporative Emission System (EVAP) canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

No these are 2 different fault codes, although they are related to the same system
EVAP control system does not operate properly.
- EVAP control system has a leak in the line between intake manifold and EVAP control system pressure sensor.

Possible causes include ...
- EVAP canister purge volume control solenoid valve stuck closed.
- EVAP control system pressure sensor and its circuit.
- Loose, disconnected, or improper connection of rubber tube.
- Blocked rubber tube.
- Blocked or bent rubber tube to MAP/BARO switch solenoid valve.
- Cracked EVAP canister.
- EVAP canister purge volume control solenoid valve.
- Closed Throttle Position Switch.
- Improper connection of one-way valve.
- Blocked purge port.
- EVAP canister vent control valve.

Fault Code:- P0443 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Control area


Fault Description: EVAP canister purge valve circuit malfunction

Action of ECM:- ECM Default: - Canister purge inhibited - Adaptive fuel metering inhibited


After clearing the DTC, complete the Purge system monitor drivecycle
Check for a reoccurrence of fault DTC.

Possible Fault:- EVAP Canister purge valve to ECM drive circuit: open circuit, short circuit, high resistance EVAP Canister purge valve power supply circuit: open circuit, short circuit EVAP Canister purge valve operating vacuum hose leak / restriction EVAP Canister purge valve failure

Check fault codes here http://www.bluejag.co.uk/diagnosticcodes.php

The code says "evap purge flow monitor fault"
Possible causes include ...
- EVAP canister purge volume control solenoid valve stuck closed.
- EVAP control system pressure sensor and its circuit.
- Loose, disconnected, or improper connection of rubber tube.
- Blocked rubber tube.
- Blocked or bent rubber tube to MAP/BARO switch solenoid valve.
- Cracked EVAP canister.
- EVAP canister purge volume control solenoid valve.
- Closed Throttle Position Switch.
- Improper connection of one-way valve.
- Blocked purge port.
- EVAP canister vent control valve.


This is a "jackpot" code. It points to so many possible causes as to be almost useless.

P0449 - Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

Both are refer at EVAP system; other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0446 - P0453 - P0455 - P0456

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms: You likely won't notice any drivability problems.
Causes: most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions: the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary


Hope helps.

sad to say that you miss on what you did, dtc P0449 was related to vent solenoid contol circuit, purge problem indicates P0443,, check the vent valve connectors supply voltage from the power distribution box, (fuse # 14-tcm/batt) and the other wire(almost white) to ecm C1 #61.

P0446 Evaporative Emission System Vent Control Circuit.
The following are descriptions of all Evaporative possible codes:

P0441 Evaporative Emission System Incorrect Purge Flow
P0442 Evaporative Emission System Leak Detected (small leak)
P0443 Evaporative Emission System Purge Control Valve Circuit
P0444 Evaporative Emission System Purge Control Valve Circuit Open
P0445 Evaporative Emission System Purge Control Valve Circuit Shorted
P0446 Evaporative Emission System Vent Control Circuit
P0447 Evaporative Emission System Vent Control Circuit Open
P0448 Evaporative Emission System Vent Control Circuit Shorted
P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
P0450 Evaporative Emission System Pressure Sensor/Switch
P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance
P0452 Evaporative Emission System Pressure Sensor/Switch Low
P0453 Evaporative Emission System Pressure Sensor/Switch High
P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent
P0455 Evaporative Emission System Leak Detected (large leak)
P0456 Evaporative Emission System Leak Detected (very small leak)
P0457 Evaporative Emission System Leak Detected (fuel cap loose/off)
P0458 Evaporative Emission System Purge Control Valve Circuit Low
P0459 Evaporative Emission System Purge Control Valve Circuit High
---
At least the cap isn't loose for the gas tank.

I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.

Hope this helps,

Trouble Code: P1441 (2.2L L4 VIN F Auto)
EVAP System Flow During Non-Purge Print this code data
Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details

• EVAP Details
• MIL Details

Trouble Code Conditions:
DTC P0107, P0108, P0112, P0113, P0117, P0118, P0121-P0123, P0125, P0440, P0442, P0443, P0446, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121 and P1122 not set, engine started, vehicle speed less than 75 mph, system voltage over 10.0v, ECT and IAT sensors from 39-86ºF and within 16ºF at startup, BARO sensor over 75 kPa, fuel level from 15-85%, PCM detected a continuous open purge flow condition with the fuel tank pressure decreasing to less than -11" H2O during the test. The PCM seals the EVAP system by commanding the EVAP Purge valve "off" and the EVAP Canister Vent valve "on". The PCM monitors the fuel tank pressure (FTP) sensor to detect if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a set value for a certain time, this code is set.

Possible Causes:

• An improperly installed or damaged EVAP canister purge valve
  
• A temporary blockage in the EVAP canister purge valve, purge pipe, or EVAP canister could cause an intermittent condition
  
• FTP sensor is out-of-calibration, damaged or "skewed"
  
• Purge solenoid valve is damaged or has failed
  
• PCM has failed
  
• TSB 02-06-04-046 contains a repair procedure for this code