Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Durango 1998-2000 Approved Dodge Durango 2000 00dn_25
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DN EMISSION CONTROL SYSTEMS 25 - 1
EMISSION CONTROL SYSTEMS
TABLE OF CONTENTS
page page
ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . . . 1 EVAPORATIVE EMISSION CONTROLS . . . . . . . . . 24
ON-BOARD DIAGNOSTICS
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION TASK MANAGER--GASOLINE POWERED
EMISSION SYSTEM. . . . . . . . . . . . . . . . . . . . . . . .1 ENGINES ONLY . . . . . . . . . . . . . . . . . . . . . . . . 16
MALFUNCTION INDICATOR LAMP (MIL) . . . . . . . .2 MONITORED SYSTEMS. . . . . . . . . . . . . . . . . . . . 19
STATE DISPLAY TEST MODE . . . . . . . . . . . . . . . .2 TRIP DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . 21
CIRCUIT ACTUATION TEST MODE . . . . . . . . . . . .2 COMPONENT MONITORS . . . . . . . . . . . . . . . . . . 22
DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . . .2 NON-MONITORED CIRCUITS . . . . . . . . . . . . . . . 22
DIAGNOSTIC TROUBLE CODE HIGH AND LOW LIMITS . . . . . . . . . . . . . . . . . . . . 23
DESCRIPTIONS . . . . . . . . . . . . . . . . . ........3 LOAD VALUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DESCRIPTION AND OPERATION Trouble Code (DTC) in the PCM's memory. If the
code applies to a non-emissions related component or
EMISSION SYSTEM system, and the problem is repaired or ceases to
exist, the PCM cancels the code after 40 warm-up
OPERATION cycles. Diagnostic trouble codes that affect vehicle
The Powertrain Control Module (PCM) monitors emissions illuminate the Malfunction Indicator
many different circuits in the fuel injection, ignition, (check engine) Lamp. Refer to Malfunction Indicator
emission and engine systems. If the PCM senses a Lamp in this section.
problem with a monitored circuit often enough to Certain criteria must be met before the PCM
indicate an actual problem, it stores a Diagnostic 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.
There are several operating conditions for which
the PCM monitors and sets DTC's. Refer to Moni-
Fig. 1 Data Link (Diagnostic) Connector Location tored Systems, Components, and Non-Monitored Cir-
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