open gas tank DODGE TOWN AND COUNTRY 2003 Service Manual

LUBRICANTS AND GREASES
Lubricating grease is rated for quality and usage
by the NLGI. All approved products have the NLGI
symbol (Fig. 4) on the label. At the bottom of the
NLGI symbol is the usage and quality identification
letters. Wheel bearing lubricant is identified by the
letter ªGº. Chassis lubricant is identified by the letter
ªLº. The letter following the usage letter indicates
the quality of the lubricant. The following symbols
indicate the highest quality.
SPECIALIZED LUBRICANTS AND OILS
Some maintenance or repair procedures may
require the use of specialized lubricants or oils. Con-
sult the appropriate sections in this manual for the
correct application of these lubricants.
DESCRIPTION - ENGINE COOLANT
WARNING: ANTIFREEZE IS AN ETHYLENE GLYCOL
BASE COOLANT AND IS HARMFUL IF SWAL-
LOWED OR INHALED. IF SWALLOWED, DRINK
TWO GLASSES OF WATER AND INDUCE VOMIT-
ING. IF INHALED, MOVE TO FRESH AIR AREA.
SEEK MEDICAL ATTENTION IMMEDIATELY. DO NOT
STORE IN OPEN OR UNMARKED CONTAINERS.
WASH SKIN AND CLOTHING THOROUGHLY AFTER
COMING IN CONTACT WITH ETHYLENE GLYCOL.
KEEP OUT OF REACH OF CHILDREN. DISPOSE OF
GLYCOL BASE COOLANT PROPERLY, CONTACT
YOUR DEALER OR GOVERNMENT AGENCY FOR
LOCATION OF COLLECTION CENTER IN YOUR
AREA. DO NOT OPEN A COOLING SYSTEM WHEN
THE ENGINE IS AT OPERATING TEMPERATURE OR
HOT UNDER PRESSURE, PERSONAL INJURY CAN
RESULT. AVOID RADIATOR COOLING FAN WHEN
ENGINE COMPARTMENT RELATED SERVICE IS
PERFORMED, PERSONAL INJURY CAN RESULT.
CAUTION: Use of Propylene Glycol based coolants
is not recommended, as they provide less freeze
protection and less boiling protection.The cooling system is designed around the coolant.
The coolant must accept heat from engine metal, in
the cylinder head area near the exhaust valves and
engine block. Then coolant carries the heat to the
radiator where the tube/fin radiator can transfer the
heat to the air.
The use of aluminum cylinder blocks, cylinder
heads, and water pumps requires special corrosion
protection. MopartAntifreeze/Coolant, 5
Year/100,000 Mile Formula (MS-9769), or the equiva-
lent ethylene glycol base coolant with hybrid organic
corrosion inhibitors (called HOAT, for Hybrid Organic
Additive Technology) is recommended. This coolant
offers the best engine cooling without corrosion when
mixed with 50% Ethylene Glycol and 50% distilled
water to obtain a freeze point of -37ÉC (-35ÉF). If it
loses color or becomes contaminated, drain, flush,
and replace with fresh properly mixed coolant solu-
tion.
The green coolantMUST NOT BE MIXEDwith
the orange or magenta coolants. When replacing cool-
ant the complete system flush must be performed
before using the replacement coolant.
CAUTION: MoparTAntifreeze/Coolant, 5
Year/100,000 Mile Formula (MS-9769) may not be
mixed with any other type of antifreeze. Doing so
will reduce the corrosion protection and may result
in premature water pump seal failure. If non-HOAT
coolant is introduced into the cooling system in an
emergency, it should be replaced with the specified
coolant as soon as possible.
DESCRIPTION - FLEXIBLE FUEL ENGINE OIL
The information in this section is for Flexible Fuel
Vehicles (FFV) only. These vehicles can be identified
by the unique Fuel Filler Door Label that states
Ethanol (E-85) or Unleaded Gasoline Only. This sec-
tion only covers those subjects that are unique to
these vehicles. Please refer to the other sections of
this manual for information on features that are
common between Flexible Fuel and gasoline only
powered vehicles.
ETHANOL FUEL (E-85)
E-85 is a mixture of approximately 85% fuel etha-
nol and 15% unleaded gasoline.
WARNING: Ethanol vapors are extremely flammable
and could cause serious personal injury. Never
have any smoking materials lit in or near the vehi-
cle when removing the fuel filler tube cap (gas cap)
or filling the tank. Do not use E-85 as a cleaning
agent and never use it near an open flame.
Fig. 4 NLGI SYMBOL
1 - WHEEL BEARINGS
2 - CHASSIS LUBRICATION
3 - CHASSIS AND WHEEL BEARINGS
RSLUBRICATION & MAINTENANCE0-3
FLUID TYPES (Continued)
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With engine not running, remove radiator pressure
cap and wipe the radiator filler neck sealing seat
clean. The radiator should be full.
Attach the Cooling System Tester 7700 or equiva-
lent to the radiator, as shown in (Fig. 4) and apply
104 kPa (15 psi) pressure. If the pressure drops more
than 13.8 kPa (2 psi) in 2 minutes, inspect all points
for external leaks.
All radiator and heater hoses should be shaken
while at 104 kPa (15 psi), since some leaks occur only
while driving due to engine movement.
If there are no external leaks, after the gauge dial
shows a drop in pressure, detach the tester. Start
engine and run until the thermostat opens, allowing
the coolant to expand. Reattach the cooling systemtester. If the needle on the dial fluctuates it indicates
a combustion leak, usually a head gasket leak.
WARNING: WITH TOOL IN PLACE, PRESSURE WILL
BUILD UP FAST. EXCESSIVE PRESSURE BUILT UP,
BY CONTINUOUS ENGINE OPERATION, MUST BE
RELEASED TO A SAFE PRESSURE POINT. NEVER
PERMIT PRESSURE TO EXCEED 138 kPa (20 psi).
If the needle on the dial does not fluctuate, raise
the engine rpm a few times. If an abnormal amount
of coolant or steam emits from the tailpipe, it may
indicate a coolant leak caused by a faulty head gas-
ket, cracked engine block, or cracked cylinder head.
There may be internal leaks that can be deter-
mined by removing the oil dipstick. If water globules
appear intermixed with the oil it will indicate an
internal leak in the engine. If there is an internal
leak, the engine must be disassembled for repair.
DIAGNOSIS AND TESTING - COOLING SYSTEM
FLOW CHECK
To determine whether coolant is flowing through
the cooling system, use one of the following proce-
dures:
PREFERRED METHOD
WARNING: DO NOT REMOVE THE COOLING SYS-
TEM PRESSURE CAP OR ANY HOSE WITH THE
SYSTEM HOT AND UNDER PRESSURE BECAUSE
SERIOUS BURNS FROM COOLANT CAN OCCUR.
²Remove pressure cap when engine is cold.
Remove small amount of coolant. Idle engine until
thermostat opens. You should observe coolant flow
while looking down the filler neck. Once flow is
detected install the pressure cap. Replace removed
coolant into coolant recovery container.
ALTERNATIVE METHOD
²If engine is cold, idle engine until normal oper-
ating temperature is reached. Feel the upper radiator
hose. If it is hot, coolant is circulating.
DIAGNOSIS AND TESTING - COOLING SYSTEM
AERATION
Low coolant level in a cross flow radiator will
equalize in both tanks with engine off. With engine
at running and at operating temperature, the high
pressure inlet tank runs full and the low pressure
outlet tank drops, resulting in cooling system aera-
tion. Aeration will draw air into the water pump
resulting in the following:
²High reading shown on the temperature gauge.
²Loss of coolant flow through the heater core.
Fig. 3 Hose Clamp Tool
1 - HOSE CLAMP TOOL 6094
2 - HOSE CLAMP
Fig. 4 Pressure Testing
RSCOOLING7-3
COOLING (Continued)
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ENGINE
DIAGNOSIS AND TESTING - ENGINE COOLING
SYSTEM
Establish what driving condition caused the cooling
system complaint. The problem may be caused by an
abnormal load on the system such as the following:
prolonged idle, very high ambient temperature, slight
tail wind at idle, slow traffic speed, traffic jam, high
speed, steep grade.
DRIVING TECHNIQUES
To avoid overheating the cooling system:
(1) Idle with A/C off when temperature gauge is at
end of normal range.
(2) Do not increase engine speed for more air flow
and coolant flow because the electric motor fan sys-
tems are not responsive to engine RPM. The added
cooling from higher coolant flow rate is more than
offset by increased heat rejection (engine heat added
to coolant).
TRAILER TOWING
Consult the owner's manual under Trailer Towing
and do not exceed specified limits.
VISUAL INSPECTION
If the cooling system problem is not caused by a
driving condition, perform a visual inspection to
determine if there was a recent service or accident
repair, including the following:
²Loose/damaged water pump drive belt
²Incorrect cooling system refilling (trapped air or
low level)
²Brakes possibly dragging
²Damaged hoses
²Loose/damaged hose clamps
²Damaged/incorrect engine thermostat
²Damaged cooling fan motor, fan blade and fan
shroud
²Damaged head gasket
²Damaged water pump
²Damaged radiator
²Damaged coolant recovery system
²Damaged heater core
²Open/shorted electrical circuits
If the visual inspection reveals none of the above
as cause for a cooling system complaint, refer to the
following diagnostic charts.
COOLING SYSTEM DIAGNOSIS CHART
CONDITION POSSIBLE CAUSES CORRECTION
PRESSURE CAP IS BLOWING
OFF STEAM AND/OR COOLANT.
TEMPERATURE GAUGE READING
MAY BE ABOVE NORMAL BUT
NOT HIGH. COOLANT LEVEL MAY
BE HIGH IN COOLANT RESERVE/
OVERFLOW TANK.1. Pressure relief valve in radiator
cap is defective, or was not
properly seated.1. Check condition of radiator cap
and cap seal. (Refer to 7 -
COOLING/ENGINE/RADIATOR
PRESSURE CAP - DIAGNOSIS
AND TESTING) Replace cap as
necessary.
2. Incorrect cap was installed. 2. Replace cap as necessary.
3. Incorrect coolant mixture. 3. Check concentration level of the
coolant. (Refer to 7 - COOLING/
ENGINE/COOLANT - DIAGNOSIS
AND TESTING) Adjust the ethylene
glycol-to-water ratio as required.
COOLANT LOSS TO THE
GROUND WITHOUT PRESSURE
CAP BLOWOFF. GAUGE IS
READING HIGH OR HOT.1. Coolant leaks in radiator, cooling
system hoses, water pump or
engine.1. Pressure test and repair as
necessary. (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING)
7 - 14 ENGINERS
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RADIATOR DRAINCOCK
REMOVAL
CAUTION: Use of pliers on draincock is not recom-
mended. Damage may occur to radiator or drain-
cock.
NOTE: It is not necessary to remove draincock dur-
ing a routine coolant drain.
(1) Drain the cooling system. (Refer to 7 - COOL-
ING - STANDARD PROCEDURE)
(2) Open the draincock by turning it counterclock-
wise until it stops.
(3) Turn the draincock back (clockwise) 1/8 turn.
(4) Pull the draincock (Fig. 16) from the radiator
tank.
INSTALLATION
(1) Align draincock stem to radiator tank opening.
(2) Push draincock into the radiator tank opening.
(3) Tighten the draincock by turning clockwise
until it stops.(4) Fill the cooling system. (Refer to 7 - COOLING
- STANDARD PROCEDURE)
RADIATOR PRESSURE CAP
DESCRIPTION
The cooling system pressure cap is located on the
radiator. The cap construction includes; stainless
steel swivel top, rubber seals, and retainer, main
spring, and a spring loaded valve (Fig. 17).
Fig. 15 Radiator to A/C Condenser Mounting (left
mount shown, right similar)
1 - SCREW - A/C CONDENSER SIDE BRACKET TO RADIATOR
2 - LOWER MOUNT
3 - A/C CONDENSER
Fig. 16 Draincock
1 - RADIATOR TANK
2 - DRAINCOCK
Fig. 17 Cooling System Pressure Cap Filler Neck
1 - OVERFLOW NIPPLE
2 - MAIN SPRING
3 - GASKET RETAINER
4 - STAINLESS-STEEL SWIVEL TOP
5 - RUBBER SEALS
6 - VENT VALVE
7 - RADIATOR
8 - FILLER NECK
7 - 26 ENGINERS
RADIATOR (Continued)
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OPERATION
The cooling system is equipped with a pressure cap
that releases excessive pressure; maintaining a range
of 97-124 kPa (14-18 psi).
The cooling system will operate at higher than
atmospheric pressure. The higher pressure raises the
coolant boiling point thus, allowing increased radia-
tor cooling capacity.
There is also a vent valve in the center of the cap.
This valve also opens when coolant is cooling and
contracting, allowing the coolant to return to cooling
system from coolant reserve system tank by vacuum
through a connecting hose.If valve is stuck shut,
or the coolant recovery hose is pinched, the
radiator hoses will be collapsed on cool down.
Clean the vent valve (Fig. 17) and inspect cool-
ant recovery hose routing, to ensure proper
sealing when boiling point is reached.
The gasket in the cap seals the filler neck, so that
vacuum can be maintained, allowing coolant to be
drawn back into the radiator from the reserve tank.
If the gasket is dirty or damaged, a vacuum
may not be achieved, resulting is loss of coolant
and eventual overheating due to low coolant
level in radiator and engine.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - COOLING SYSTEM
PRESSURE CAP TESTING
Dip the pressure cap in water. Clean any deposits
off the vent valve or its seat and apply cap to end of
the Pressure Cap Test Adaptor that is included with
the Cooling System Tester 7700 (Fig. 18). Working
the plunger, bring the pressure to 104 kPa (15 psi) on
the gauge. If the pressure cap fails to hold pressure
of at least 97 kPa (14 psi), replace the pressure cap.
CAUTION: The Cooling System Tester Tool is very
sensitive to small air leaks that will not cause cool-
ing system problems. A pressure cap that does not
have a history of coolant loss should not be
replaced just because it leaks slowly when tested
with this tool. Add water to the tool. Turn tool
upside down and recheck pressure cap to confirm
that cap is bad.
If the pressure cap tests properly while positioned
on Cooling System Tester (Fig. 18), but will not hold
pressure or vacuum when positioned on the filler
neck. Inspect the filler neck and cap top gasket for
irregularities that may prevent the cap from sealing
properly.
DIAGNOSIS AND TESTING - RADIATOR CAP
TO FILLER NECK SEAL
The pressure cap upper gasket (seal) pressure
relief can be checked by removing the overflow hose
at the radiator filler neck nipple (Fig. 19). Attach the
Radiator Pressure Tool to the filler neck nipple and
pump air into the radiator. Pressure cap upper gas-
ket should relieve at 69-124 kPa (10-18 psi) and hold
pressure at 55 kPa (8 psi) minimum.
Fig. 18 Testing Cooling System Pressure Cap
1 - PRESSURE CAP
2 - PRESSURE TESTER
Fig. 19 Radiator Pressure Cap Filler Neck
1 - OVERFLOW NIPPLE
2 - MAIN SPRING
3 - GASKET RETAINER
4 - STAINLESS-STEEL SWIVEL TOP
5 - RUBBER SEALS
6 - VENT VALVE
7 - RADIATOR
8 - FILLER NECK
RSENGINE7-27
RADIATOR PRESSURE CAP (Continued)
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WARNING: THE WARNING WORDS ªDO NOT OPEN
HOTº ON THE RADIATOR PRESSURE CAP IS A
SAFETY PRECAUTION. WHEN HOT, PRESSURE
BUILDS UP IN COOLING SYSTEM. TO PREVENT
SCALDING OR INJURY, THE RADIATOR CAP
SHOULD NOT BE REMOVED WHILE THE SYSTEM
IS HOT OR UNDER PRESSURE.
There is no need to remove the radiator cap at any
timeexceptfor the following purposes:
(1) Check and adjust coolant freeze point.
(2) Refill system with new coolant.
(3) Conducting service procedures.
(4) Checking for vacuum leaks.
WARNING: IF VEHICLE HAS BEEN RUN RECENTLY,
WAIT 15 MINUTES BEFORE REMOVING CAP. THEN
PLACE A SHOP TOWEL OVER THE CAP AND WITH-
OUT PUSHING DOWN ROTATE COUNTERCLOCK-
WISE TO THE FIRST STOP. ALLOW FLUIDS TO
ESCAPE THROUGH THE OVERFLOW TUBE AND
WHEN THE SYSTEM STOPS PUSHING COOLANT
AND STEAM INTO THE CRS TANK AND PRESSURE
DROPS PUSH DOWN AND REMOVE THE CAP COM-
PLETELY. SQUEEZING THE RADIATOR INLET HOSE
WITH A SHOP TOWEL (TO CHECK PRESSURE)
BEFORE AND AFTER TURNING TO THE FIRST
STOP IS RECOMMENDED.
CLEANING
Use only a mild soap to clean the pressure cap.
INSPECTION
Hold the cap in your hand,top side up(Fig. 20).
The vent valve at the bottom of the cap should open.
If the rubber gasket has swollen, preventing the
valve from opening, replace the cap.Hold the cleaned cap in your hand,upside down.
If any light can be seen between vent valve and the
rubber gasket, replace the cap.Do not use a
replacement cap that has a spring to hold the
vent shut.
A replacement cap must be of the type designed for
coolant reserve systems. This design ensures coolant
return to the radiator.
RADIATOR FAN
DESCRIPTION
The dual radiator fans are mounted to the back
side of the radiator (Fig. 21). The radiator fan consist
of the fan blade, electric motor and a support shroud
which are all serviced as an assembly.
Fig. 20 Cooling System Pressure Cap
1 - OVERFLOW NIPPLE
2 - MAIN SPRING
3 - GASKET RETAINER
4 - STAINLESS-STEEL SWIVEL TOP
5 - RUBBER SEALS
6 - VENT VALVE
7 - RADIATOR
8 - FILLER NECK
7 - 28 ENGINERS
RADIATOR PRESSURE CAP (Continued)
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FUEL DELIVERY
DESCRIPTION
DESCRIPTION
The front wheel drive car uses a plastic fuel tank
located rear center of the vehicle.
The Fuel Delivery System consists of: the following
items:
²Electric fuel pump module
²Fuel filter
²Tubes/lines/hoses
²Fuel injectors
The in-tank fuel pump module contains the fuel
pump. The pump is serviced as part of the fuel pump
module. Refer to Fuel Pump Module.
The fuel filter is replaceable only as part of the
fuel pump module.
DESCRIPTION - FFV REPLACEMENT PARTS
Many components in a Flexible Fuel Vehicle (FFV)
are designed to be compatible with ethanol. Always
be sure that the vehicle is serviced with correct etha-
nol compatible parts.
CAUTION: Replacing fuel system components with
non-ethanol compatible components can damage
your vehicle and may void the warranty.
OPERATION
The fuel system provides fuel pressure by an
in-tank pump module. The PCM controls the opera-
tion of the fuel system by providing battery voltage
to the fuel pump through the fuel pump relay. The
PCM requires only three inputs and a good ground to
operate the fuel pump relay. The three inputs are:
²Ignition voltage
²Crankshaft Position (CKP) sensor
²Camshaft Position (CMP) sensor
DIAGNOSIS AND TESTING - FUEL DELIVERY
SYSTEM
(Refer to Appropriate Diagnostic Information)
STANDARD PROCEDURE
STANDARD PROCEDURE - FUEL SYSTEM
PRESSURE RELEASE PROCEDURE
(1) Remove Fuel Pump relay from Power Distribu-
tion Center (PDC). For location of relay, refer to label
on underside of PDC cover.
(2) Start and run engine until it stalls.(3) Attempt restarting engine until it will no
longer run.
(4) Turn ignition key to OFF position.
(5) Return fuel pump relay to PDC.
(6) One or more Diagnostic Trouble Codes (DTC's)
may have been stored in PCM memory due to fuel
pump relay removal. The DRB IIItscan tool must be
used to erase a DTC.
STANDARD PROCEDURE - DRAINING FUEL
TANK
Two different procedures may be used to drain fuel
tank (lowering tank or using DRB scan tool).
The quickest draining procedure involves lowering
the fuel tank.
WARNING: RELEASE FUEL SYSTEM PRESSURE
BEFORE SERVICING FUEL SYSTEM COMPONENTS.
SERVICE VEHICLES IN WELL VENTILATED AREAS
AND AVOID IGNITION SOURCES. NEVER SMOKE
WHILE SERVICING THE VEHICLE.
As an alternative procedure, the electric fuel pump
may be activated allowing tank to be drained at fuel
rail connection. Refer to DRBIIItscan tool for fuel
pump activation procedures. Before disconnecting
fuel line at fuel rail, release fuel pressure. Refer to
the Fuel System Pressure Release Procedure in this
group for procedures. Disconnect the fuel line at the
fuel rail and remove the plastic retainer from the
fuel rail. Take plastic retainer and install it back into
the fuel line from body. Attach end of special test
hose tool number 8978 at fuel line connection from
the body line. Position opposite end of this hose tool
to an approved gasoline draining station. Activate
fuel pump and drain tank until empty. When done
remove the special test hose tool number 8978 from
the body line. Remove the plastic retainer from the
special test hose tool number 8978 and reinstall it
into the fuel line from the body. Install the fuel line
to the fuel rail.
If electric fuel pump is not operating, tank must be
lowered for fuel draining. Refer to following proce-
dures.
(1) Remove fuel filler cap.
(2) Perform the Fuel System Pressure Release pro-
cedure.
(3) Disconnect negative cable from battery.
(4) Raise vehicle and support.
(5) Certain models are equipped with a separate
grounding wire (strap) connecting the fuel fill tube
assembly to the body. Disconnect wire by removing
screw.
(6) Open fuel fill door and remove screws mount-
ing fuel filler tube assembly to body. Do not discon-
14 - 2 FUEL DELIVERYRS
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nect rubber fuel fill or vent hoses from tank at this
time.
(7) Place a transmission jack under center of fuel
tank. Apply a slight amount of pressure to fuel tank
with transmission jack.
(8) Remove fuel tank mounting strap nuts from
mounting strap studs.
(9)Lower the tank just enough so that the
filler tube fitting is the highest point of the fuel
tank.
(10) Remove filler tube from fuel tank. Tank will
be drained through this fitting.
WARNING: WRAP SHOP TOWELS AROUND HOSES
TO CATCH ANY GASOLINE SPILLAGE.(11) Drain fuel tank into holding tank or a prop-
erly labeledGasolinesafety container.
CAUTION: GASOLINE OR GASOLINE VAPORS ARE
HIGHLY FLAMMABLE. A FIRE COULD OCCUR IF AN
IGNITION SOURCE IS PRESENT. NEVER DRAIN OR
STORE GASOLINE OR DIESEL FUEL IN AN OPEN
CONTAINER, DUE TO THE POSSIBILITY OF FIRE
OR EXPLOSION.
(12) If fuel pump module removal is necessary,
refer to Fuel Pump Module Removal/Installation in
this section.
SPECIFICATIONS
FUEL SYSTEM PRESSURE
400 kpa  34 kpa (58 psi   5 psi)
TORQUE
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Fuel Filler Neck Clamp 3.3 30
Fuel Rail 2.4L 22 200
Fuel Rail 3.3/3.8L 11.8 105
Fuel Tank Strap 54 40
Fuel Tank T Strap 28.2 250
Fuel Filter Bolt 4.5 40
SPECIAL TOOLS
FUEL
Pressure Gauge Assembly C±4799±B
Fuel Pressure Test Adapter 6539
RSFUEL DELIVERY14-3
FUEL DELIVERY (Continued)
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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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