Exhaust Gas Recirculation (Egr) System - Chrysler 2000 LHS Owner's Manual

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EXHAUST GAS RECIRCULATION (EGR) SYSTEM

DESCRIPTION AND OPERATION
EXHAUST GAS RECIRCULATION (LSEGR) . . . . . 27
REMOVAL AND INSTALLATION
EGR VALVE—2.7L . . . . . . . . . . . . . . . . . . . . . . . . 27
EGR VALVE—3.2/3.5L . . . . . . . . . . . . . . . . . . . . . 27
DESCRIPTION AND OPERATION
EXHAUST GAS RECIRCULATION (LSEGR)
DESCRIPTION
The EGR valve consists of three major components.
First there is the pintle, valve seat, and housing
which contains and regulates the gas flow. Second
there is the armature, return spring, and solenoid
coil to provide the operating force to regulate the
flow by changing the pintle position. The solenoid coil
assembly is in parallel with a diode and connects to
the two connectors in the connector assembly. The
third major component which senses pintle position
and is connected to the three connectors in the elec-
trical connector.
OPERATION
The exhaust gas recirculation flow is determined
by the engine controller. For a given set of conditions,
the engine controller 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 engine con-
troller adjusts the duty cycle of 128 Hz power sup-
plied to the solenoid coil to obtain the correct
position.
REMOVAL AND INSTALLATION
EGR VALVE—2.7L
REMOVAL
The EGR valve attaches to the rear of the right
cylinder head.
(1) Disconnect negative battery cable.
(2) Remove air inlet tube and resonator and
bracket.
(3) Disconnect electrical connector from solenoid.
(4) Remove EGR upper tube screws at EGR valve.
(5) Remove EGR valve mounting screws.
TABLE OF CONTENTS
page
EGR TUBE UPPER—2.7L . . . . . . . . . . . . . . . . . . 28
EGR TUBE LOWER—2.7L . . . . . . . . . . . . . . . . . . 29
EGR TUBE—3.2/3.5L . . . . . . . . . . . . . . . . . . . . . . 29
SPECIFICATIONS
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
(6) Remove screws from EGR lower tube at
exhaust manifold.
(7) Remove EGR valve and lower tube as an
assembly.
(8) Clean gasket surfaces. Discard old gasket. If
necessary, clean EGR passages.
INSTALLATION
(1) Loosely install EGR valve and lower tube, use
a new gasket between tube and EGR valve.
(2) Install EGR valve to rear of Cylinder head, do
not tighten screws.
(3) Loosely install screws to lower EGR tube to
exhaust manifold, use new gasket between tube and
exhaust manifold.
(4) Install new gasket between the EGR valve and
upper tube and install bolts.
(5) Tighten EGR lower tube to exhaust manifold
screws to 31 N·m (275 in. lbs.) torque.
(6) Tighten the EGR tube's to EGR valve bolts to
11 N·m (95 in. lbs.) torque.
(7) Tighten EGR valve to cylinder head screws to
31 N·m (275 in. lbs.) torque.
(8) Attach electrical connector to solenoid.
(9) Install the resonator bracket.
(10) Install air inlet tube and resonator.
(11) Connect negative battery cable.
EGR VALVE—3.2/3.5L
REMOVAL
(1) Disconnect negative battery cable.
(2) Remove air inlet tube and resonator.
(3) Disconnect
valve.
(4) Remove EGR tube mounting screws at EGR
valve.
The EGR valve attaches to the rear of the right
cylinder head.
(5) Remove EGR valve mounting screws.
(6) Clean gasket surfaces. Discard old gasket. If
necessary, clean EGR passages.
EMISSION CONTROL SYSTEMS
electrical connector
25 - 27
page
from EGR