Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 2000 XJ Jeep Cherokee exj_25

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XJ                                                                                               EMISSION CONTROL SYSTEMS                                                    25 - 1



                              EMISSION CONTROL SYSTEMS
                                               TABLE OF CONTENTS

                                                                        page                                                                                                     page

ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . . . 1                         EVAPORATIVE EMISSION CONTROLS . . . . . . . . . 23



                                     ON-BOARD DIAGNOSTICS

                                                            TABLE OF CONTENTS
                                                                        page                                                                                                     page

DESCRIPTION AND OPERATION                                                             TASK MANAGER . . . . . . . . . .       .   .   .   .   .   .   .   .   .   .   .   .   .   .   . 16
 EMISSION SYSTEM. . . . . . . . . . . . . . . .     .   .   .   .   .   .   .   .1    MONITORED SYSTEMS. . . . .             .   .   .   .   .   .   .   .   .   .   .   .   .   .   . 19
 MALFUNCTION INDICATOR LAMP (MIL)                   .   .   .   .   .   .   .   .2    TRIP DEFINITION . . . . . . . . .      .   .   .   .   .   .   .   .   .   .   .   .   .   .   . 21
 STATE DISPLAY TEST MODE . . . . . . . .            .   .   .   .   .   .   .   .2    COMPONENT MONITORS . . .               .   .   .   .   .   .   .   .   .   .   .   .   .   .   . 21
 CIRCUIT ACTUATION TEST MODE . . . .                .   .   .   .   .   .   .   .2    NON-MONITORED CIRCUITS                 .   .   .   .   .   .   .   .   .   .   .   .   .   .   . 22
 DIAGNOSTIC TROUBLE CODES . . . . . .               .   .   .   .   .   .   .   .2    HIGH AND LOW LIMITS . . . . .          .   .   .   .   .   .   .   .   .   .   .   .   .   .   . 22
 DIAGNOSTIC TROUBLE CODE                                                              LOAD VALUE . . . . . . . . . . . . .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   . 22
   DESCRIPTIONS . . . . . . . . . . . . . . . . .   ........3

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



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