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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>> Download exj_25 documenatation <<Text preview - extract from the documentXJ 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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