Dodge Durango (HB). Manual — part 1576
FUEL PRESSURE
The fuel pressure regulator controls fuel system pressure. The PCM cannot detect a clogged fuel pump inlet filter,
clogged in-line fuel filter, or a pinched fuel supply or return line. However, these could result in a rich or lean con-
dition causing the PCM to store an oxygen sensor or fuel system diagnostic trouble code.
SECONDARY IGNITION CIRCUIT
The PCM cannot detect an inoperative ignition coil, fouled or worn spark plugs, ignition cross firing, or open spark
plug cables.
CYLINDER COMPRESSION
The PCM cannot detect uneven, low, or high engine cylinder compression.
EXHAUST SYSTEM
The PCM cannot detect a plugged, restricted or leaking exhaust system, although it may set a fuel system fault.
FUEL INJECTOR MECHANICAL MALFUNCTIONS
The PCM cannot determine if a fuel injector is clogged, the needle is sticking or if the wrong injector is installed.
However, these could result in a rich or lean condition causing the PCM to store a diagnostic trouble code for either
misfire, an oxygen sensor, or the fuel system.
EXCESSIVE OIL CONSUMPTION
Although the PCM monitors engine exhaust oxygen content when the system is in closed loop, it cannot determine
excessive oil consumption.
THROTTLE BODY AIR FLOW
The PCM cannot detect a clogged or restricted air cleaner inlet or filter element.
VACUUM ASSIST
The PCM cannot detect leaks or restrictions in the vacuum circuits of vacuum assisted engine control system
devices. However, these could cause the PCM to store a MAP sensor diagnostic trouble code and cause a high idle
condition.
PCM SYSTEM GROUND
The PCM cannot determine a poor system ground. However, one or more diagnostic trouble codes may be gener-
ated as a result of this condition. The module should be mounted to the body at all times, also during diagnostic.
PCM CONNECTOR ENGAGEMENT
The PCM may not be able to determine spread or damaged connector pins. However, it might store diagnostic
trouble codes as a result of spread connector pins.
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EMISSIONS
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EVAPORATIVE EMISSIONS
TABLE OF CONTENTS
page
page
EVAPORATIVE EMISSIONS
. . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . 11
SOLENOID-EVAP/PURGE
. . . . . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
. . . . . . . . . . . . . . . . . . . . . . . . . 13
CAP-FUEL FILLER
. . . . . . . . . . . . . . . . . . . . . . . . . 13
. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
. . . . . . . . . . . . . . . 13
ORVR
. . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PUMP-NATURAL VAC LEAK DETECTION
. . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . 16
VALVE-PCV
. . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PCV VALVE - 3.7L V-6/ 4.7L V-8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . 23
LINES-VACUUM
. . . . . . . . . . . . . . . . . . . . . . . . . 23
CANISTER-VAPOR
. . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
. . . . . . . . . . . . . . . . . . . . . . . . . 25
EVAPORATIVE EMISSIONS
DESCRIPTION
HIGH AND LOW LIMITS
The PCM compares input signal voltages from each input device with established high and low limits for the device.
If the input voltage is not within limits and other criteria are met, the PCM stores a diagnostic trouble code in mem-
ory. Other diagnostic trouble code criteria might include engine RPM limits or input voltages from other sensors or
switches that must be present before verifying a diagnostic trouble code condition.
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EVAPORATIVE EMISSIONS
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DIAGNOSIS AND TESTING
OBD II Monitor Information
Comprehensive Components
Monitor
Major Monitors Non Fuel
Control & Non Misfire
Major Monitors Fuel Control &
misfire
(Includes All Engine Hardware
Sensor, Switches, Solenoids,
etc.)
(Monitors Entire Emission
System)
(Monitors Entire System)
Most are one trip Faults
Most are Two Trips Faults
Two Trip Faults
Usually Turns on The Mill and
Sets DTC After One Failure
Turns On The Mil and Sets
DTC after Two Consecutive
Failure
The Mil and Sets DTC After Two
Consecutive Failure
Priority 3
Priority 1 or 3
Priority 2 or 4
All Checked For Continuity
Done Stop Test = Yes
Fuel Control Monitor
Open
Oxygen Sensor Heater
Monitors Fuel Control
Short To Ground
Oxygen Sensor Response
System For:
Short To Voltage
Catalytic Converter
Fuel System Lean
Inputs Checked For Rationality
Efficiency Except EWMA
Fuel System Rich
Outputs Checked For
Functionality
up to 6 test per trip and a one
trip fault (SBEC) and two trip
fault on (JTEC)
Requires 3 Consecutive Fuel
System Good Trips to Extinguish
the MIL
EGR System
Misfire Monitor
Evaporative Emission System
(purge and leak)
Monitors for Engine Misfire At:
Non-LDP
4 X 1000 RPM Counter (4000
Revs) (Type B)
LDP
**200 X 3 (600) RPM counter
(Type A)
Requires 3 Consecutive Global
Good Trips to Extinguish the
MIL*
Requires 3 Consecutive Global
Good Trips to Extinguish the
MIL*
Requires 3 Consecutive Global
Good Trips to Extinguish the MIL
*40 Warm Up Cycles are
required to erase DTCs after the
MIL has been extinguished
** Type A misfire is a one trip
failure on pre-1999, 2 trip failure
on 1999 and later. The MIL will
illuminate at the first or second
failure, based on MY.
OBD II MONITOR RUN PROCESS
The following procedure has been established to assist Chrysler Dealer Technicians in the field with enabling and
running OBD II Monitors. The order listed in the following procedure is intended to allow the technician to effectively
complete each monitor and to set the CARB Readiness Status in the least time possible.
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EVAPORATIVE EMISSIONS
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Note: A. Once the monitor run process has begun, do not turn off the ignition. By turning the ignition key
off, monitor enabling conditions will be lost. NVLD Monitor runs after key off.B. By performing a Battery
Disconnect, or Selecting Erase DTCs, the CARB Readiness and all additional OBD II information will be
cleared.
Monitor Preliminary Checks:
1. Plug a SCAN TOOL into the vehicle’s Data Link Connector (DLC).
2. Turn the ignition, KEY ON - ENGINE OFF. Watch for MIL lamp illumination during the bulb check. MIL lamp must
have illuminated, if not, repair MIL lamp.
3. On the SCAN TOOL Select #1Stand-alone.
4. Select #1 1998-2004 Diagnostics.
5. Select #1 Engine.
6. Select #2 DTCs and Related Functions.
7. Select #1 Read DTCs.
•
Verify that No Emissions Related DTCs are Present.
•
* If an Emissions DTC is Present, the OBD II Monitors may not run and the CARB Readiness will not
update.
•
The Emissions related DTC, will need to be repaired, then cleared. By clearing DTCs, the OBD Monitors will
need to be run and completed to set the CARB Readiness Status.
8. Return to Engine Select Function Menu and Select #9, OBD II Monitors.
9. Select #3 CARB Readiness Status.
Do all the CARB Readiness Status Locations read YES?.
•
*YES, then all monitors have been completed and this vehicle is ready to be I/M or Emission Tested.
•
*NO, then the following procedure needs to be followed to run/complete all available monitors.
Note: A. Only the monitors, which are not YES in the CARB Readiness Status, need to be completed.B.
Specific criteria need to be met for each monitor. Each monitor has a Pre-Test screen to assist in running
the monitor. For additional information, refer to the DaimlerChrysler Corporation Technical Training Work-
book titled On Board Diagnostics: OBD II/EOBD, part number 81-699-01050.C. The most efficient order to
run the monitors has been outlined below, including suggestions to aid the process.
Natural Vacuum Leak Detection with Purge Monitor
This monitor requires a cool down cycle, usually an overnight soak for at least 8 hours without the engine running.
The ambient temperature must decrease overnight - parking the vehicle outside is advised. To run this test the fuel
level must be between 15-85% full. For the monitor run conditions select the EVAP MON PRE-TEST in the SCAN
TOOL, OBD II Monitors Menu.The Purge monitor will run if the small leak test reports a pass. Criteria for NVLD
monitor:
•
Engine off time greater than @ one hour.
•
Fuel Level between 15% and 85 %.
•
Start Up ECT and IAT within 10 C (18 F).
•
Vehicle started and run until Purge Monitor reports a result.
Note: If the vehicle does not report a result and the conditions where correct. It may take up to two weeks
to fail the small leak monitor. DO NOT use this test to attempt to determine a fault. Use the appropriate
service information procedure for finding a small leak. If there are no faults and the conditions are correct
this test will run and report a pass. Note the Small leak test can find leaks less than 10 thousands of an
inch. If a small leak is present it takes approximately one week of normal driving to report a failure.
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EVAPORATIVE EMISSIONS
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