Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Durango 1998-2000 Approved Dodge Durango 1998-99 98DN_25

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DN                                                                             EMISSION CONTROL SYSTEMS                       25 - 1



                             EMISSION CONTROL SYSTEMS
                                                      CONTENTS

                                                       page                                                                    page

EVAPORATIVE EMISSION CONTROLS . . . . . . . . 13                ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . . 1



                                       ON-BOARD DIAGNOSTICS

                                                           INDEX
                                                       page                                                                    page

GENERAL INFORMATION                                                LOAD VALUE . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
 SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . 1        MALFUNCTION INDICATOR LAMP (MIL) . . . . . . . 2
DESCRIPTION AND OPERATION                                          MONITORED SYSTEMS . . . . . . . . . . . . . . . . . . . . 8
 CIRCUIT ACTUATION TEST MODE . . . . . . . . . . . 2               NON-MONITORED CIRCUITS . . . . . . . . . . . . . . . 11
 COMPONENT MONITORS . . . . . . . . . . . . . . . . . 11           STATE DISPLAY TEST MODE . . . . . . . . . . . . . . . 2
 DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . . 2              TRIP DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . 10
 HIGH AND LOW LIMITS . . . . . . . . . . . . . . . . . . . 12

GENERAL INFORMATION                                             diagnostic trouble code criteria requires the PCM to
                                                                monitor the circuit only when the engine operates
SYSTEM DESCRIPTION                                              between 750 and 2000 RPM. Suppose the sensor's
   The Powertrain Control Module (PCM) monitors                 output circuit shorts to ground when engine operates
many different circuits in the fuel injection, ignition,        above 2400 RPM (resulting in 0 volt input to the
emission and engine systems. If the PCM senses a                PCM). Because the condition happens at an engine
problem with a monitored circuit often enough to                speed above the maximum threshold (2000 rpm), the
indicate an actual problem, it stores a Diagnostic              PCM will not store a DTC.
Trouble Code (DTC) in the PCM's memory. If the                    There are several operating conditions for which
code applies to a non-emissions related component or            the PCM monitors and sets DTC's. Refer to Moni-
system, and the problem is repaired or ceases to                tored Systems, Components, and Non-Monitored Cir-
exist, the PCM cancels the code after 40 warm-up                cuits in this section.
cycles. Diagnostic trouble codes that affect vehicle              Technicians must retrieve stored DTC's by connect-
emissions illuminate the Malfunction Indicator                  ing the DRB scan tool (or an equivalent scan tool) to
(check engine) Lamp. Refer to Malfunction Indicator             the 16

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