Chrysler 300M 2002 Service Manual page 1682

LH
EMISSIONS CONTROL
DESCRIPTION
DESCRIPTION - MONITORED COMPONENT
DESCRIPTION - VEHICLE EMISSION
CONTROL INFORMATION LABEL . . . . . . . . . . 5
DESCRIPTION - TRIP DEFINITION
OPERATION - NON-MONITORED CIRCUITS
DESCRIPTION - MONITORED SYSTEMS
EMISSIONS CONTROL
DESCRIPTION
DESCRIPTION - MONITORED COMPONENT
There are several components that will affect vehi-
cle emissions if they malfunction. If one of these com-
ponents malfunctions the Malfunction Indicator
Lamp (Check Engine) will illuminate.
Some of the component monitors are checking for
proper operation of the part. Electrically operated
components now have input (rationality) and output
(functionality) checks. Previously, a component like
the Throttle Position sensor (TPS) was checked by
the PCM for an open or shorted circuit. If one of
these conditions occurred, a DTC was set. Now there
is a check to ensure that the component is working.
This is done by watching for a TPS indication of a
greater or lesser throttle opening than MAP and
engine rpm indicate. In the case of the TPS, if engine
vacuum is low and engine rpm is 1600 or greater and
the TPS indicates a small throttle opening, a DTC
will be set. The same applies to low vacuum and
1600 rpm.
Any component that has an associated limp in will
set a fault after 1 trip with the malfunction present.
Refer to the Diagnostic Trouble Codes Description
Charts (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/POWERTRAIN
MODULE - DESCRIPTION) and the appropriate
Powertrain Diagnostic Procedure Manual for diag-
nostic procedures.
The following is a list of the monitored compo-
nents:
• Comprehensive Components
• Oxygen Sensor Monitor
• Oxygen Sensor Heater Monitor
• Catalyst Monitor
EMISSIONS CONTROL
TABLE OF CONTENTS
page
OPERATION
. 1
EVAPORATIVE EMISSIONS
. . . . . . . . . 5 EXHAUST GAS RECIRCULATION
. . 5 ON-BOARD DIAGNOSTICS
. . . . 6
COMPREHENSIVE COMPONENTS
that the diagnostic system monitor any component
that could affect emissions levels. In many cases,
these components were being tested under OBD I.
The OBD I requirements focused mainly on testing
emissions-related components for electrical opens and
shorts.
powertrain components to the PCM be tested for
rationality, and that outputs to powertrain compo-
nents from the PCM be tested for functionality.
Methods for monitoring the various Comprehensive
Component monitoring include:
NOTE: Comprehensive component monitors are
continuous. Therefore, enabling conditions do not
apply.
PCM are constantly being monitored for electrical
opens and shorts, they are also tested for rationality.
This means that the input signal is compared against
CONTROL
other inputs and information to see if it makes sense
under the current conditions.
include:
EMISSIONS CONTROL 25 - 1
DESCRIPTION - HIGH AND LOW LIMITS
OPERATION - SYSTEM
DRB III STATE DISPLAY TEST MODE
Along with the major monitors, OBD II requires
However, OBD II also requires that inputs from
(1) Circuit Continuity
• Open
• Shorted high
• Shorted to ground
(2) Rationality or Proper Functioning
• Inputs tested for rationality
• Outputs tested for functionality
Input Rationality—While input signals to the
PCM sensor inputs that are checked for rationality
• Manifold Absolute Pressure (MAP) Sensor
• Oxygen Sensor (O2S)
• Engine Coolant Temperature (ECT) Sensor
• Camshaft Position (CMP) Sensor
• Vehicle Speed Sensor
• Crankshaft Position (CKP) Sensor
page
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