Trouble code P0404
Thread Starter
Joined: Jul 2007
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Trouble code P0404
I have a 2004 Dodge Ram 1550 with the 5.7 Hemi. My check engine light came on and I ran a code check and found it to be a P0404. The book says it is an Exhaust Gas Recirculation Circuit Tange/Performance. What is this and can I fix it?
Champion
Joined: Mar 2004
Posts: 2,703
Likes: 2
From: Bremen, GA.
RE: Trouble code P0404
It sounds like you EGR valve has died or the wiring is bad.
DESCRIPTION
The electronic EGR valve and solenoid assembly is attached to the front of the right cylinder head. An exhaust gas routing tube connects the EGR valve to the intake manifold.
OPERATION
Exhaust gas recirculation flow is determined by the Powertrain Control Module (PCM) and is controlled by an electronic EGR valve assembly. For a given set of conditions, the PCM knows the ideal exhaust gas recirculation flow to optimize NOx and fuel economy as a function of the pintle position. Pintle position is obtained from the position sensor. The PCM adjusts the duty cycle of 128 Hz power supplied to the solenoid coil to obtain the correct position.
The electronic EGR valve assembly consists of a pintle, valve seat, and housing which contains and regulates exhaust gas flow. An armature, return spring, and solenoid coil provide the operating force to regulate exhaust gas flow by changing the pintle position. The solenoid coil assembly is wired in parallel with a diode that connects two internal connectors.
REMOVAL – 5.7L
The electronic EGR valve and solenoid assembly (3) is attached to the front of the right cylinder head (1). An exhaust gas routing tube connects the EGR valve to the intake manifold.
[ol][*]Disconnect electrical connector (1) from EGR solenoid (2).[*]Remove two bolts (3) connecting EGR tube (4) to valve assembly.[*]Remove gasket located between EGR tube flange and EGR valve assembly.[*]Remove two mounting bolts (2).[*]Separate valve assembly (3) from cylinder head (1).[*]Remove and discard metal gasket located between cylinder head and valve assembly.[/ol]
DESCRIPTION
The electronic EGR valve and solenoid assembly is attached to the front of the right cylinder head. An exhaust gas routing tube connects the EGR valve to the intake manifold.
OPERATION
Exhaust gas recirculation flow is determined by the Powertrain Control Module (PCM) and is controlled by an electronic EGR valve assembly. For a given set of conditions, the PCM knows the ideal exhaust gas recirculation flow to optimize NOx and fuel economy as a function of the pintle position. Pintle position is obtained from the position sensor. The PCM adjusts the duty cycle of 128 Hz power supplied to the solenoid coil to obtain the correct position.
The electronic EGR valve assembly consists of a pintle, valve seat, and housing which contains and regulates exhaust gas flow. An armature, return spring, and solenoid coil provide the operating force to regulate exhaust gas flow by changing the pintle position. The solenoid coil assembly is wired in parallel with a diode that connects two internal connectors.
REMOVAL – 5.7L
The electronic EGR valve and solenoid assembly (3) is attached to the front of the right cylinder head (1). An exhaust gas routing tube connects the EGR valve to the intake manifold.
[ol][*]Disconnect electrical connector (1) from EGR solenoid (2).[*]Remove two bolts (3) connecting EGR tube (4) to valve assembly.[*]Remove gasket located between EGR tube flange and EGR valve assembly.[*]Remove two mounting bolts (2).[*]Separate valve assembly (3) from cylinder head (1).[*]Remove and discard metal gasket located between cylinder head and valve assembly.[/ol]
