Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Neon 1997.1999.2000.2004 Approved Dodge Neon 1997 EPL_25
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PL EMISSION CONTROL SYSTEMS 25 - 1
EMISSION CONTROL SYSTEMS
CONTENTS
page page
EVAPORATIVE EMISSION CONTROLS . . . . . . . 12 ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . 1
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ON-BOARD DIAGNOSTICS
INDEX
page page
GENERAL INFORMATION LOAD VALUE . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . 1 MALFUNCTION INDICATOR LAMP (MIL) . . . . . . 1
DESCRIPTION AND OPERATION MONITORED SYSTEMS . . . . . . . . . . . . . . . . . . 7
CIRCUIT ACTUATION TEST MODE . . . . . . . . . . 2 NON-MONITORED CIRCUITS . . . . . . . . . . . . . 10
COMPONENT MONITORS . . . . . . . . . . . . . . . . 10 STATE DISPLAY TEST MODE . . . . . . . . . . . . . . 2
DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . 2 TRIP DEFINITION . . . . . . . . . . . . . . . . . . . . . . 10
HIGH AND LOW LIMITS . . . . . . . . . . . . . . . . . . 11
GENERAL INFORMATION output circuit shorts to ground when engine operates
above 2400 RPM (resulting in 0 volt input to the
SYSTEM DESCRIPTION PCM). Because the condition happens at an engine
The Powertrain Control Module (PCM) monitors speed above the maximum threshold (2000 rpm), the
many different circuits in the fuel injection, ignition, PCM will not store a DTC.
emission and engine systems. If the PCM senses a There are several operating conditions for which
problem with a monitored circuit often enough to the PCM monitors and sets DTC's. Refer to Moni-
indicate an actual problem, it stores a Diagnostic tored Systems, Components, and Non-Monitored Cir-
Trouble Code (DTC) in the PCM's memory. If the cuits in this section.
code applies to a non-emissions related component or
system, and the problem is repaired or ceases to NOTE: Various diagnostic procedures may actually
exist, the PCM cancels the code after 40 warmup cause a diagnostic monitor to set a DTC. For
cycles. Diagnostic trouble codes that affect vehicle instance, pulling a spark plug wire to perform a
emissions illuminate the Malfunction Indicator Lamp spark test may set the misfire code. When a repair
(MIL). Refer to Malfunction Indicator Lamp in this is completed and verified, use the DRB scan tool to
section. erase all DTC's and extinguish the MIL.
Certain criteria must be met before the PCM
Technicians can display stored DTC's by two differ-
stores a DTC in memory. The criteria may be a spe-
ent methods. Refer to Diagnostic Trouble Codes in
cific range of engine RPM, engine temperature,
this section. For DTC information, refer to charts in
and/or input voltage to the PCM.
this section.
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 DESCRIPTION AND OPERATION
circuit has not been met. For example , assume the
diagnostic trouble code criteria requires the PCM to MALFUNCTION INDICATOR LAMP (MIL)
monitor the circuit only when the engine operates As a functional test, the Malfunction Indicator
between 750 and 2000 RPM. Suppose the sensor's Lamp (MIL) illuminates at key-on before engine
DIAGNOSTIC CON-
NECTOR
25 - 2 EMISSION CONTROL SYSTEMS PL
DESCRIPTION AND OPERATION (Continued)
CIRCUIT ACTUATION TEST MODE
The Circuit Actuation Test Mode checks for proper
operation of output circuits or devices the Powertrain
Control Module (PCM) may not internally recognize.
The PCM attempts to activate these outputs and
allow an observer to verify proper operation. Most of
the tests provide an audible or visual indication of
device operation (click of relay contacts, fuel spray,
etc.). Except for intermittent conditions, if a device
functions properly during testing, assume the device,
its associated wiring, and driver circuit work cor-
rectly.
DIAGNOSTIC TROUBLE CODES
A Diagnostic Trouble Code (DTC) indicates the
PCM has recognized an abnormal condition in the
Fig. 1 Data Link (Diagnostic) Connector system.
cranking. Whenever the Powertrain Control Module The technician can retrieve and display DTC's in
(PCM) sets a Diagnostic Trouble Code (DTC) that two different ways:
affects vehicle emissions, it illuminates the MIL. If a ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo