Mechanics

DODGE INTREPID ENGINE PROBLEM

2002 Dodge Intrepid

2002 Dodge Intrepid 6 cyl

P0441_EVAP
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Mako
December 18, 2008.



I am not sure what you need, but here is the description of P0441

P0441 Evaporative Emission Control System Incorrect Purge Flow
OBD-II Trouble Code Technical Description

Evaporative Emission Control System Incorrect Purge Flow

What does that mean?

This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. 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.

EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.

Symptoms

Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light.

Causes

A code P0441 could mean one or more of the following has happened: * Bad vacuum switch
* Broken or damaged EVAP line or canister
* Open in PCM purge command circuit
* Open or short in Voltage feed circuit to Purge Solenoid
* Faulty purge solenoid
* Restriction in EVAP solenoid, line or canister
* Corrosion or resistance in purge connector
* Bad PCM

Possible Solutions

With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try: * Common Chrysler fix - Replace Leak Detection Pump / LDP
* Repair damaged EVAP lines or canister
* Repair open or short in voltage feed circuit to Purge Solenoid
* Repair open in PCM purge command circuit
* Replace purge Solenoid
* Replace vacuum switch
* Repair restriction in Evap line or canister or soleniod
* Repair resistance in purge connector
* Replace PCM

Tiny
Zackman
Dec 18, 2008.
In my case it was the bleeder filter that was clogged up. The filter is mounted just behind the fuel tank. I came to this solution after reading and checking an answer from someone on the Justanswer website. see copy later.
Hello inspector 13, The set condition for this trouble code po441 has nothing to do with the oxygen sensor changing voltage when the purge valve opens up.

The Pcm gradually increases purge flow. During flow the PCM looks for the NVLD (natural vacuum leak detection) switch to close. If the PCM does not see the switch close at maxium flow an error is detected.

First pull up the lower cushion for the back seat, there is a wiring connector on the right side. We always check this first because we had a couple vehicle with corroded connections.

The problem we at Chrysler, are finding is the internal switch at the NVLD is not working properly and closing as it should.

This unit is located on the right side of the gas tank, and is part of the charcoal canister.

REMOVAL
Disconnect the negative battery cable.
Remove fuel tank, refer to the Fuel Delivery section for Fuel Tank Removal.
Disconnect the electrical connector from the NVLD assembly.
Disconnect the hoses from the NVLD assembly
Lift tab on NVLD assembly and twist the assembly counterclockwise and pull up to remove from EVAP canister
Remove O-ring from EVAP canister .

View Full Image


http://www.2carpros.com/forum/automotive_pictures/520506_Carbon_cannister_1.jpg


Tiny
TDHomeMechanic
Apr 24, 2010.