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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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