2003 CHRYSLER CARAVAN open gas tank

chemical reaction takes place. This means the con-
centration of oxygen will be the same downstream as
upstream. The output voltage of the downstream
O2S copies the voltage of the upstream sensor. The
only difference is a time lag (seen by the PCM)
between the switching of the O2S's.
To monitor the system, the number of lean-to-rich
switches of upstream and downstream O2S's is
counted. The ratio of downstream switches to
upstream switches is used to determine whether the
catalyst is operating properly. An effective catalyst
will have fewer downstream switches than it has
upstream switches i.e., a ratio closer to zero. For a
totally ineffective catalyst, this ratio will be one-to-
one, indicating that no oxidation occurs in the device.
The system must be monitored so that when cata-
lyst efficiency deteriorates and exhaust emissions
increase to over the legal limit, the MIL (Check
Engine lamp) will be illuminated.
NATURAL VACUUM LEAK DETECTION (NVLD) (if equipped)
The Natural Vacuum Leak Detection (NVLD) sys-
tem is the next generation evaporative leak detection
system that will first be used on vehicles equipped
with the Next Generation Controller (NGC). This
new system replaces the leak detection pump as the
method of evaporative system leak detection. This is
to detect a leak equivalent to a 0.0209(0.5 mm) hole.
This system has the capability to detect holes of this
size very dependably.
The basic leak detection theory employed with
NVLD is the9Gas Law9. This is to say that the pres-
sure in a sealed vessel will change if the temperature
of the gas in the vessel changes. The vessel will only
see this effect if it is indeed sealed. Even small leaks
will allow the pressure in the vessel to come to equi-
librium with the ambient pressure. In addition to the
detection of very small leaks, this system has the
capability of detecting medium as well as large evap-
orative system leaks.
The NVLD seals the canister vent during engine off
conditions. If the EVAP system has a leak of less than
the failure threshold, the evaporative system will be
pulled into a vacuum, either due to the cool down
from operating temperature or diurnal ambient tem-
perature cycling. The diurnal effect is considered one
of the primary contributors to the leak determination
by this diagnostic. When the vacuum in the system
exceeds about 19H2O (0.25 KPA), a vacuum switch
closes. The switch closure sends a signal to the NGC.
The NGC, via appropriate logic strategies (described
below), utilizes the switch signal, or lack thereof, to
make a determination of whether a leak is present.
The NVLD device is designed with a normally open
vacuum switch, a normally closed solenoid, and a
seal, which is actuated by both the solenoid and a
diaphragm. The NVLD is located on the atmosphericvent side of the canister. The NVLD assembly may
be mounted on top of the canister outlet, or in-line
between the canister and atmospheric vent filter. The
normally open vacuum switch will close with about 19
H2O (0.25 KPA) vacuum in the evaporative system.
The diaphragm actuates the switch. This is above the
opening point of the fuel inlet check valve in the fill
tube so cap off leaks can be detected. Submerged fill
systems must have recirculation lines that do not
have the in-line normally closed check valve that pro-
tects the system from failed nozzle liquid ingestion,
in order to detect cap off conditions.
The normally closed valve in the NVLD is intended
to maintain the seal on the evaporative system dur-
ing the engine off condition. If vacuum in the evapo-
rative system exceeds 39to 69H2O (0.75 to 1.5 KPA),
the valve will be pulled off the seat, opening the seal.
This will protect the system from excessive vacuum
as well as allowing sufficient purge flow in the event
that the solenoid was to become inoperative.
The solenoid actuates the valve to unseal the can-
ister vent while the engine is running. It also will be
used to close the vent during the medium and large
leak tests and during the purge flow check. This sole-
noid requires initial 1.5 amps of current to pull the
valve open but after 100 ms. will be duty cycled down
to an average of about 150 mA for the remainder of
the drive cycle.
Another feature in the device is a diaphragm that
will open the seal in the NVLD with pressure in the
evaporative system. The device will9blow off9at
about 0.59H2O (0.12 KPA) pressure to permit the
venting of vapors during refueling. An added benefit
to this is that it will also allow the tank to9breathe9
during increasing temperatures, thus limiting the
pressure in the tank to this low level. This is benefi-
cial because the induced vacuum during a subse-
quent declining temperature will achieve the switch
closed (pass threshold) sooner than if the tank had to
decay from a built up pressure.
The device itself has 3 wires: Switch sense, sole-
noid driver and ground. It also includes a resistor to
protect the switch from a short to battery or a short
to ground. The NGC utilizes a high-side driver to
energize and duty-cycle the solenoid.
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 diagnos-
tic trouble code in memory. 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.
25 - 8 EMISSIONS CONTROLRS
EMISSIONS CONTROL (Continued)
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FRONT SUSPENSION, SPECIAL TOOLS.....2-3
FRONT WASHER PUMP MOTOR -
INSTALLATION.......................8R-8
FRONT WASHER PUMP MOTOR -
REMOVAL...........................8R-8
FRONT WHEEL SPEED SENSOR -
INSTALLATION........................5-80
FRONT WHEEL SPEED SENSOR -
REMOVAL...........................5-79
FRONT WHEELHOUSE SPLASH SHIELD -
INSTALLATION.......................23-54
FRONT WHEELHOUSE SPLASH SHIELD -
REMOVAL..........................23-54
FRONT WIPER ARM ALIGNMENT -
STANDARD PROCEDURE...............8R-8
FRONT WIPER ARMS - INSTALLATION....8R-9
FRONT WIPER ARMS - REMOVAL........8R-9
FRONT WIPER MOTOR - INSTALLATION . . . 8R-9
FRONT WIPER MOTOR - REMOVAL.......8R-9
FRONT WIPER SYSTEM - DIAGNOSIS
AND TESTING........................8R-2
FRONT WIPER/WASHER SWITCH -
DIAGNOSIS AND TESTING..............8R-2
FRONT/QUAD SEAT CUSHION -
INSTALLATION.......................23-92
FRONT/QUAD SEAT CUSHION -
REMOVAL..........................23-92
FRONT-WHEEL-DRIVE - INSTALLATION....2-36
FRONT-WHEEL-DRIVE - REMOVAL........2-35
FUEL CORRECTION OR ADAPTIVE
MEMORIES, OPERATION...............14-20
FUEL DELIVERY SYSTEM - DIAGNOSIS
AND TESTING........................14-2
FUEL DOSING PUMP - DESCRIPTION....24-108
FUEL DOSING PUMP - INSTALLATION . . . 24-108
FUEL DOSING PUMP - OPERATION.....24-108
FUEL DOSING PUMP - REMOVAL.......24-108
FUEL ENGINE OIL - DESCRIPTION,
FLEXIBLE.............................0-3
FUEL FILL DOOR - INSTALLATION.......23-51
FUEL FILL DOOR - REMOVAL...........23-51
FUEL FILL DOOR BLOCKER LATCH -
INSTALLATION.......................23-52
FUEL FILL DOOR BLOCKER LATCH -
REMOVAL..........................23-52
FUEL FILL DOOR BLOCKER LATCH
STRIKER - INSTALLATION..............23-52
FUEL FILL DOOR BLOCKER LATCH
STRIKER - REMOVAL.................23-52
FUEL FILL DOOR BLOCKER LOCKOUT
LINK - INSTALLATION.................23-53
FUEL FILL DOOR BLOCKER LOCKOUT
LINK - REMOVAL.....................23-52
FUEL FILLER CAP - DESCRIPTION.......25-12
FUEL FILLER CAP - OPERATION.........25-12
FUEL FILTER - INSTALLATION............14-4
FUEL FILTER - REMOVAL...............14-4
FUEL INJECTOR - DESCRIPTION.........14-26
FUEL INJECTOR - OPERATION..........14-26
FUEL LEVEL SENDING UNIT / SENSOR -
DESCRIPTION........................14-4
FUEL LEVEL SENDING UNIT / SENSOR -
INSTALLATION........................14-5
FUEL LEVEL SENDING UNIT / SENSOR -
OPERATION..........................14-5
FUEL LEVEL SENDING UNIT / SENSOR -
REMOVAL...........................14-5
FUEL LINE - INSTALLATION...........24-110
FUEL LINE - REMOVAL...............24-109
FUEL LINES/HOSES AND CLAMPS -
DESCRIPTION........................14-6
FUEL PRESSURE REGULATOR -
INSTALLATION........................14-7
FUEL PRESSURE REGULATOR -
OPERATION..........................14-7
FUEL PRESSURE REGULATOR -
REMOVAL...........................14-7
FUEL PUMP - DESCRIPTION.............14-7
FUEL PUMP - OPERATION..............14-7
FUEL PUMP MODULE - DESCRIPTION.....14-8
FUEL PUMP MODULE - INSTALLATION....14-9
FUEL PUMP MODULE - OPERATION.......14-8
FUEL PUMP MODULE - REMOVAL
........14-8
FUEL PUMP RELAY - DESCRIPTION
......14-28
FUEL PUMP RELAY - OPERATION
........14-28
FUEL REQUIREMENTS - DESCRIPTION
......0-4
FUEL REQUIREMENTS - DIESEL ENGINE
- DESCRIPTION
........................0-6FUEL, SPECIAL TOOLS............14-23,14-3
FUEL SYSTEM PRESSURE RELEASE
PROCEDURE - STANDARD
PROCEDURE.........................14-2
FUEL SYSTEM PRESSURE,
SPECIFICATIONS......................14-3
FUEL TANK - DESCRIPTION............14-10
FUEL TANK - INSTALLATION............14-11
FUEL TANK - OPERATION..............14-10
FUEL TANK - REMOVAL...............14-11
FUEL TANK - STANDARD PROCEDURE,
DRAINING...........................14-2
FUEL TANK FILLER TUBE -
INSTALLATION.......................14-12
FUEL TANK FILLER TUBE - REMOVAL....14-12
FULL OPEN SWITCH - DESCRIPTION....8N-12,
8N-31
FULL OPEN SWITCH - INSTALLATION....8N-13
FULL OPEN SWITCH - OPERATION . 8N-12,8N-31
FULL OPEN SWITCH - REMOVAL........8N-13
FUNCTIONS - DESCRIPTION, CIRCUIT . . 8W-01-6
FUSE - DESCRIPTION, IOD...........8W-97-4
FUSE - INSTALLATION, IOD..........8W-97-5
FUSE - OPERATION, IOD.............8W-97-5
FUSE - REMOVAL, IOD..............8W-97-5
FUSES POWERING SEVERAL LOADS -
STANDARD PROCEDURE, TESTING
FOR A SHORT TO GROUND ON......8W-01-10
FWD - INSTALLATION..............2-41,2-44
FWD - INSTALLATION, REAR WHEEL
SPEED SENSOR.......................5-81
FWD - REMOVAL..................2-40,2-44
FWD - REMOVAL, REAR WHEEL SPEED
SENSOR............................5-81
GALLERY PLUGS - STANDARD
PROCEDURE, ENGINE CORE AND OIL . 9-10,9-86
GAP - STANDARD PROCEDURE,
COMPRESSOR CLUTCH AIR............24-17
GAP AND FLUSH MEASUREMENTS -
SPECIFICATIONS....................23-121
GAP, SPECIFICATIONS - WHEEL SPEED
SENSOR AIR.........................5-79
GAS - INSTALLATION, MODULAR
CLUTCH ASSY - 2.4L..................6-11
GAS - REMOVAL, MODULAR CLUTCH
ASSY - 2.4L..........................6-11
GASKET - DIAGNOSIS AND TESTING,
CYLINDER HEAD..................9-24,9-99
GASKET SURFACE PREPARATION -
STANDARD PROCEDURE, ENGINE....9-11,9-85
GASKETS AND SEALERS - STANDARD
PROCEDURE, FORM-IN-PLACE.......9-11,9-84
GEAR - DESCRIPTION.................19-26
GEAR - INSTALLATION, LHD............19-32
GEAR - INSTALLATION, RHD............19-33
GEAR & LINK ROD - DESCRIPTION, LIFT . 8N-16
GEAR & LINK ROD - INSTALLATION,
LIFT...............................8N-16
GEAR & LINK ROD - OPERATION, LIFT . . . 8N-16
GEAR & LINK ROD - REMOVAL, LIFT.....8N-16
GEAR - OPERATION...................19-27
GEAR - REMOVAL, LHD...............19-27
GEAR - REMOVAL, RHD...............19-31
GEAR END PLAY - ADJUSTMENT,
DIFFERENTIAL SIDE..................21-70
GEAR SHIFT CABLE - INSTALLATION....21-205
GEAR SHIFT CABLE - REMOVAL........21-204
GEAR SHIFT LEVER - INSTALLATION.....19-21
GEAR SHIFT LEVER - REMOVAL.........19-21
GEAR, SPECIAL TOOLS - POWER
STEERING..........................19-34
GEARSHIFT BOOT - INSTALLATION......21-73
GEARSHIFT BOOT - REMOVAL..........21-72
GEARSHIFT CABLE - CROSSOVER -
INSTALLATION.......................21-76
GEARSHIFT CABLE - CROSSOVER -
REMOVAL..........................21-73
GEARSHIFT CABLE - SELECTOR -
INSTALLATION.......................21-84
GEARSHIFT CABLE - SELECTOR -
REMOVAL..........................21-81
GEARSHIFT CABLE ADJUSTMENT,
ADJUSTMENTS
.....................21-206
GEARSHIFT KNOB - INSTALLATION
......21-87
GEARSHIFT KNOB - REMOVAL
..........21-87
GEARSHIFT MECHANISM -
INSTALLATION
.......................21-89
GEARSHIFT MECHANISM - REMOVAL
....21-87GEARTRAIN - DESCRIPTION,
PLANETARY........................21-232
GEARTRAIN - OPERATION, PLANETARY . . 21-232
GENERAL - WARNINGS.............8W-01-7
GENERAL DIAGNOSIS - DIAGNOSIS AND
TESTING, 41TE TRANSAXLE...........21-119
GENERATOR - DESCRIPTION...........8F-23
GENERATOR - OPERATION.............8F-23
GENERATOR DECOUPLER PULLEY -
DESCRIPTION.......................8F-25
GENERATOR DECOUPLER PULLEY -
DIAGNOSIS AND TESTING..............8F-25
GENERATOR DECOUPLER PULLEY -
INSTALLATION.......................8F-26
GENERATOR DECOUPLER PULLEY -
OPERATION.........................8F-25
GENERATOR DECOUPLER PULLEY -
REMOVAL..........................8F-26
GENERATOR, SPECIFICATIONS..........8F-22
GLASS - DESCRIPTION, HEATED.........8G-1
GLASS - INSTALLATION, DOOR.........23-17
GLASS - INSTALLATION, REAR DOOR . . . 23-108
GLASS - INSTALLATION, SIDE VIEW
MIRROR...........................23-58
GLASS - INSTALLATION, SLIDING DOOR . 23-107
GLASS - OPERATION, HEATED...........8G-1
GLASS - REMOVAL, DOOR.............23-17
GLASS - REMOVAL, REAR DOOR.......23-108
GLASS - REMOVAL, SIDE VIEW MIRROR . . 23-58
GLASS - REMOVAL, SLIDING DOOR.....23-107
GLASS INTEGRAL ANTENNA - EXPORT -
DESCRIPTION, QUARTER...............8A-9
GLASS INTEGRAL ANTENNA - EXPORT -
DIAGNOSIS AND TESTING, QUARTER.....8A-9
GLASS INTEGRAL ANTENNA - EXPORT -
OPERATION, QUARTER.................8A-9
GLASS PANEL - INSTALLATION........23-117
GLASS PANEL - REMOVAL............23-117
GLASS PANEL ADJUSTMENT,
ADJUSTMENTS - SUNROOF...........23-117
GLASS RUN WEATHERSTRIP -
INSTALLATION, FRONT DOOR..........23-110
GLASS RUN WEATHERSTRIP -
REMOVAL, FRONT DOOR.............23-110
GLOVE BOX - INSTALLATION...........23-63
GLOVE BOX - REMOVAL...............23-63
GLOVE BOX LAMP SWITCH -
INSTALLATION.......................8L-26
GLOVE BOX LAMP SWITCH - REMOVAL . . 8L-26
GLOVE BOX LATCH - INSTALLATION.....23-63
GLOVE BOX LATCH - REMOVAL.........23-63
GLOVE BOX LATCH STRIKER -
INSTALLATION.......................23-64
GLOVE BOX LATCH STRIKER - REMOVAL . 23-64
GRID LINE AND TERMINAL REPAIR -
STANDARD PROCEDURE...............8G-3
GRID LINE REPAIR REAR - STANDARD
PROCEDURE.........................8G-2
GRILLE - INSTALLATION, COWL.........23-50
GRILLE - REMOVAL, COWL............23-49
GRILLE OPENING REINFORCEMENT -
INSTALLATION
.......................23-53
GRILLE OPENING REINFORCEMENT -
REMOVAL
..........................23-53
GROCERY BAG RETAINER -
INSTALLATION, PLASTIC
..............23-103
GROCERY BAG RETAINER - REMOVAL,
PLASTIC
..........................23-103
GROMMET REPLACEMENT - STANDARD
PROCEDURE, PUSH-PIN
...............8N-28
GROUND - OPERATION, PCM
...........8E-15
GROUND - STANDARD PROCEDURE,
TESTING FOR A SHORT TO
..........8W-01-9
GROUND AND SPLICE INFORMATION -
DESCRIPTION, CONNECTOR
..........8W-01-7
GROUND ON FUSES POWERING
SEVERAL LOADS - STANDARD
PROCEDURE, TESTING FOR A SHORT
TO
.............................8W-01-10
GUIDE - INSTALLATION, UNDER SEAT
STORAGE BIN
......................23-104
GUIDE - REMOVAL, UNDER SEAT
STORAGE BIN
......................23-104
GUIDE PIN BUSHINGS (DISC/DISC
BRAKES) - ASSEMBLY, CALIPER
..........5-25
GUIDE PIN BUSHINGS (DISC/DISC
BRAKES) - DISASSEMBLY, CALIPER
.......5-24
14 INDEXRS
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