Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_25

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XJ                                                                                 EMISSION CONTROL SYSTEMS                       25 - 1



                               EMISSION CONTROL SYSTEMS
                                                         CONTENTS

                                                           page                                                                    page

EVAPORATIVE EMISSION CONTROLS . . . . . . . . 20                    ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . . 1



                                      ON-BOARD DIAGNOSTICS

                                                               INDEX
                                                           page                                                                    page

DESCRIPTION AND OPERATION                                              LOAD VALUE . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
 CIRCUIT ACTUATION TEST MODE . . . . . . . . . . . 2                   MALFUNCTION INDICATOR LAMP (MIL) . . . . . . . 1
 COMPONENT MONITORS . . . . . . . . . . . . . . . . . 18               MONITORED SYSTEMS . . . . . . . . . . . . . . . . . . . 15
 DIAGNOSTIC TROUBLE CODE                                               NON-MONITORED CIRCUITS . . . . . . . . . . . . . . 18
   DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . 3      STATE DISPLAY TEST MODE . . . . . . . . . . . . . . . 2
 DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . . 2                  SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . 1
 HIGH AND LOW LIMITS . . . . . . . . . . . . . . . . . . . 19          TRIP DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . 17

DESCRIPTION AND OPERATION                                           above 2400 RPM (resulting in 0 volt input to the
                                                                    PCM). Because the condition happens at an engine
SYSTEM DESCRIPTION                                                  speed above the maximum threshold (2000 rpm), the
   The Powertrain Control Module (PCM) monitors                     PCM will not store a DTC.
many different circuits in the fuel injection, ignition,              There are several operating conditions for which
emission and engine systems. If the PCM senses a                    the PCM monitors and sets DTC's. Refer to Moni-
problem with a monitored circuit often enough to                    tored Systems, Components, and Non-Monitored Cir-
indicate an actual problem, it stores a Diagnostic                  cuits in this section.
Trouble Code (DTC) in the PCM's memory. If the                        Technicians must retrieve stored DTC's by connect-
code applies to a non-emissions related component or                ing the DRB scan tool (or an equivalent scan tool) to
system, and the problem is repaired or ceases to                    the 16

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