Chrysler New Yorker. Manual — part 342
(3) Tighten the EGR tube to EGR valve bolts to 11
N·m (95 in. lbs.) torque.
(4) Tighten the EGR tube to exhaust manifold
bolts to 11 N·m (95 in. lbs.) torque.
(5) Install air inlet tube and resonator.
(6) Connect negative battery cable.
EGR TUBE—3.2/3.5L
The EGR tube attaches to the bottom of the intake
manifold plenum beside the throttle body (Fig. 2).
REMOVAL
(1) Disconnect negative battery cable.
(2) Remove air inlet tube and resonator.
(3) Remove EGR tube mounting clips at intake
manifold plenum (Fig. 3).
(4) Remove Intake Plenum, refer to Group 11
Intake and Exhaust Systems.
(5) Remove the fuel rail, refer to Group 14 Fuel
Delivery.
(6) Remove EGR tube mounting screws at EGR
valve.
When removing EGR upper tube assembly being
careful not to drop the silicone rubber seals in the
intake manifold. Clean gasket surfaces on the EGR
valve. Note that any loose dirt can lodge between the
pintle and the seat and cause valve leakage that will
give a rough idle and depressed manifold vacuum.
(7) Remove EGR tube.
INSTALLATION
(1) Using new gaskets, loosely install the EGR
tube and mounting screws. Make sure that the tube
is parallel with the mounting surface of the EGR
valve (Fig. 4).
(2) Tighten the EGR tube to EGR valve screws to
11 N·m (95 in. lbs.) torque.
(3) Install rubber silicone seals on intake manifold
end of EGR tube.
Install fuel rail, refer to Group 14, Fuel Delivery.
(4) Install upper tube into the intake manifold,
being careful to be sure silicone rubber seals is cor-
rectly installed and undamaged. Install Intake Ple-
num refer to Group 11, Intake and Exhaust System.
(5) Install clips for the EGR tube to intake mani-
fold plenum.
(6) Install air inlet tube and resonator.
(7) Connect negative battery cable.
SPECIFICATIONS
TORQUE
Description
Torque
EGR valve to cyl. head . . . . . . . 22 N·m (200 in. lbs.)
EGR tube to EGR valve . . . . . . . 11 N·m (95 in. lbs.)
EGR tube to intake manifold . . . . 9 N·m (80 in. lbs.)
EGR tube to exhaust manifold . . 11 N·m (95 in. lbs.)
Fig. 7 EGR Tube at Intake Manifold
300M
EMISSION CONTROL SYSTEMS
25 - 21
REMOVAL AND INSTALLATION (Continued)
EMISSION CONTROL SYSTEMS
CONTENTS
page
ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . . 1
ON-BOARD DIAGNOSTICS
INDEX
page
page
GENERAL INFORMATION
SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION AND OPERATION
CIRCUIT ACTUATION TEST MODE . . . . . . . . . . . 2
DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . . 2
MALFUNCTION INDICATOR LAMP (MIL) . . . . . . . 2
STATE DISPLAY TEST MODE . . . . . . . . . . . . . . . 2
GENERAL INFORMATION
SYSTEM DESCRIPTION
The Powertrain Control Module (PCM) monitors
many different circuits in the fuel injection, ignition,
emission and engine systems. If the PCM senses a
problem with a monitored circuit often enough to
indicate an actual problem, it stores a Diagnostic
Trouble Code (DTC) in the PCM’s memory. If the
code applies to a non-emissions related component or
system, and the problem is repaired or ceases to
exist, the PCM cancels the code after 40 warmup
cycles. Diagnostic trouble codes that affect vehicle
emissions illuminate the Malfunction Indicator Lamp
(MIL). Refer to Malfunction Indicator Lamp in this
section.
Certain criteria must be met before the PCM
stores a DTC in memory. The criteria may be a spe-
cific range of engine RPM, engine temperature,
and/or input voltage to the PCM.
The PCM might not store a DTC for a monitored
circuit even though a malfunction has occurred. This
may happen because one of the DTC criteria for the
circuit has not been met. For example , assume the
diagnostic trouble code criteria requires the PCM to
monitor the circuit only when the engine operates
between 750 and 2000 RPM. Suppose the sensor’s
output circuit shorts to ground when engine operates
above 2400 RPM (resulting in 0 volt input to the
PCM). Because the condition happens at an engine
speed above the maximum threshold (2000 rpm), the
PCM will not store a DTC.
NOTE: Various diagnostic procedures may actually
cause a diagnostic monitor to set a DTC. For
instance, disconnecting the TP Sensor with the
ignition on may set the TP Sensor High code. When
a repair is completed and verified, use the DRB
scan tool to erase all DTC’s and extinguish the MIL.
Technicians can display stored DTC’s. Refer to
Diagnostic Trouble Codes in this section. For DTC
information, refer to charts in this section.
Fig. 1 Data Link (Diagnostic) Connector
300M
EMISSION CONTROL SYSTEMS
25 - 1
DESCRIPTION AND OPERATION
MALFUNCTION INDICATOR LAMP (MIL)
As a functional test, the Malfunction Indicator
Lamp (MIL) illuminates at key-on before engine
cranking. Whenever the Powertrain Control Module
(PCM) sets a Diagnostic Trouble Code (DTC) that
affects vehicle emissions, it illuminates the MIL. If a
problem is detected, the PCM sends a message over
the PCI Bus to the instrument cluster to illuminate
the lamp. The PCM illuminates the MIL only for
DTC’s that affect vehicle emissions. The MIL stays
on continuously when the PCM has entered a
Limp-In mode or identified a failed emission compo-
nent or system. The MIL remains on until the DTC
is erased. Refer to the Diagnostic Trouble Code
charts in this group for emission related codes.
Additionally, the PCM may reset (turn off) the MIL
when one of the following occur:
• PCM does not detect the malfunction for 3 con-
secutive trips.
• PCM does not detect a malfunction while per-
forming three successive engine misfire or fuel sys-
tem tests. The PCM performs these tests while the
engine is operating within
6 375 RPM of and within
10 % of the load of the operating condition at which
the malfunction was first detected.
STATE DISPLAY TEST MODE
The switch inputs to the Powertrain Control Mod-
ule (PCM) have two recognized states; HIGH and
LOW. For this reason, the PCM cannot recognize the
difference between a selected switch position versus
an open circuit, a short circuit, or a defective switch.
If the State Display screen shows the change from
HIGH to LOW or LOW to HIGH, assume the entire
switch circuit to the PCM functions properly. From
the state display screen, access either State Display
Inputs and Outputs or State Display Sensors.
CIRCUIT ACTUATION TEST MODE
The Circuit Actuation Test Mode checks for proper
operation of output circuits or devices the Powertrain
Control Module (PCM) may not internally recognize.
The PCM attempts to activate these outputs and
allow an observer to verify proper operation. Most of
the tests provide an audible or visual indication of
device operation (click of relay contacts, fuel spray,
etc.). Except for intermittent conditions, if a device
functions properly during testing, assume the device,
its associated wiring, and driver circuit work cor-
rectly.
DIAGNOSTIC TROUBLE CODES
A Diagnostic Trouble Code (DTC) indicates the
PCM has recognized an abnormal condition in the
system.
The preferred and most accurate method of retriev-
ing a DTC is by using the DRB scan tool. The scan
tool supplies detailed diagnostic information which
can be used to more accurately diagnose causes for a
DTC.
Remember that DTC’s are the results of a sys-
tem or circuit failure, but do not directly iden-
tify the failed component or components.
NOTE: For a list of DTC’s, refer to the charts in this
section.
BULB CHECK
Each time the ignition key is turned to the ON
position, the malfunction indicator (Check Engine)
lamp on the instrument panel should illuminate for
approximately 2 seconds then go out. This is done for
a bulb check.
OBTAINING DTC’S USING DRB SCAN TOOL
(1) Connect the DRB scan tool to the data link
(diagnostic) connector. This connector is located in
the passenger compartment; at the lower edge of
instrument panel; near the steering column.
(2) Turn the ignition switch on and access the
“Read Fault” screen.
(3) Record all the DTC’s and “freeze frame” infor-
mation shown on the DRB scan tool.
(4) To erase DTC’s, use the “Erase Trouble Code”
data screen on the DRB scan tool. Do not erase any
DTC’s until problems have been investigated
and repairs have been performed.
25 - 2
EMISSION CONTROL SYSTEMS
300M
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст