2001 DODGE RAM Service Repair Manual

reset infotainment system brake pads tire pressure jack points gearbox check engine

Page 2817 of 2889

DODGE RAM 2001 Service Repair Manual (1) Clean inside of housing and lid before install-
ing new filter.
(2) Install filter into housing.
(3) Install lid to filter housing (snaps on).
(4) Position filter housing to fender.
(5) Install mo

Page 2818 of 2889

DODGE RAM 2001 Service Repair Manual EVAPORATIVE EMISSIONS
TABLE OF CONTENTS
page page
EVAPORATIVE EMISSIONS
DESCRIPTION...........................31
SPECIFICATIONS........................31
CCV HOSE
DESCRIPTION..........................

EVAPORATIVE EMISSIONS
TABLE OF CONTENTS
page page
EVAPORATIVE EMISSIONS
DESCRIPTION...........................31
SPECIFICATIONS........................31
CCV HOSE
DESCRIPTION...........................32
OPERATION.............................32
CRANKCASE VENT HOSE
DESCRIPTION...........................32
EVAP/PURGE SOLENOID
DESCRIPTION...........................32
REMOVAL..............................32
INSTALLATION...........................32
FUEL FILLER CAP
DESCRIPTION...........................33
OPERATION.............................33
REMOVAL..............................33
LEAK DETECTION PUMP
DESCRIPTION...........................33REMOVAL..............................34
INSTALLATION...........................34
PCV FILTER
DESCRIPTION...........................35
P C V VA LV E
DESCRIPTION...........................35
OPERATION.............................35
DIAGNOSIS AND TESTING.................36
PCV VALVE TEST - 3.9/5.2/5.9L ENGINE.....36
VACUUM LINES
DIAGNOSIS AND TESTING.................37
VACUUM SCHEMATICS..................37
VAPOR CANISTER
DESCRIPTION...........................37
OPERATION.............................37
REMOVAL..............................37
INSTALLATION...........................38
EVAPORATIVE EMISSIONS
DESCRIPTION - EVAP SYSTEM
The evaporation control system prevents the emis-
sion of fuel tank vapors into the atmosphere. When
fuel evaporates in the fuel tank, the vapors pass
through vent hoses or tubes into the two charcoal
filled evaporative canisters. The canisters tempo-
rarily hold the vapors. The Powertrain Control Mod-
ule (PCM) allows intake manifold vacuum to draw
vapors into the combustion chambers during certain
operating conditions.
All 3.9L/5.2L/5.9L/8.0L gasoline powered engines
use a duty cycle purge system. The PCM controlsvapor flow by operating the duty cycle EVAP purge
solenoid. Refer to Duty Cycle EVAP Canister Purge
Solenoid for additional information.
When equipped with certain emissions packages, a
Leak Detection Pump (LDP) will be used as part of
the evaporative system. This pump is used as part of
OBD II requirements. Refer to Leak Detection Pump
in this group for additional information.
NOTE: The hoses used in this system are specially
manufactured. If replacement becomes necessary, it
is important to use only fuel resistant hose.
SPECIFICATIONS
TORQUE - EVAP SYSTEM
DESCRIPTION N´m Ft. Lbs. In. Lbs.
EVAP Canister Mounting Nuts 9 80
Leak Detection Pump Mounting Screws 1 11
Leak Detection Pump Filter Mounting
Bolt765
BR/BEEVAPORATIVE EMISSIONS 25 - 31

Page 2819 of 2889

DODGE RAM 2001 Service Repair Manual CCV HOSE
DESCRIPTION - 8.0L
The 8.0L V-10 engine is equipped with a Crankcase
Ventilation (CCV) system. The CCV system performs
the same function as a conventional PCV system, but
does not use a vacuu

CCV HOSE
DESCRIPTION - 8.0L
The 8.0L V-10 engine is equipped with a Crankcase
Ventilation (CCV) system. The CCV system performs
the same function as a conventional PCV system, but
does not use a vacuum controlled valve (PCV valve).
A molded vacuum tube connects manifold vacuum
to the top of the right cylinder head (valve) cover.
The vacuum tube connects to a fixed orifice fitting
(Fig. 1) of a calibrated size 2.6 mm (0.10 inches).
OPERATION - 8.0L
A molded vacuum tube connects manifold vacuum
to the top of the right cylinder head (valve) cover.
The vacuum tube connects to a fixed orifice fitting
(Fig. 1) of a calibrated size 2.6 mm (0.10 inches). The
fitting meters the amount of crankcase vapors drawn
out of the engine.The fixed orifice fitting is grey
in color.A similar fitting (but does not contain a
fixed orifice) is used on the left cylinder head (valve)
cover. This fitting is black in color. Do not inter-
change these two fittings.When the engine is operating, fresh air enters the
engine and mixes with crankcase vapors. Manifold
vacuum draws the vapor/air mixture through the
fixed orifice and into the intake manifold. The vapors
are then consumed during engine combustion.
CRANKCASE VENT HOSE
OPERATION
The crankcase breather/filter is no longer used
with the 3.9L, 5.2L or 5.9L engine.
EVAP/PURGE SOLENOID
DESCRIPTION
All 3.9L/5.2L/5.9L/8.0L gasoline powered engines
use a duty cycle EVAP canister purge solenoid. The
solenoid regulates the rate of vapor flow from the
EVAP canister to the throttle body. The Powertrain
Control Module (PCM) operates the solenoid.
During the cold start warm-up period and the hot
start time delay, the PCM does not energize the sole-
noid. When de-energized, no vapors are purged. The
PCM de-energizes the solenoid during open loop oper-
ation.
The engine enters closed loop operation after it
reaches a specified temperature and the time delay
ends. During closed loop operation, the PCM ener-
gizes and de-energizes the solenoid 5 or 10 times per
second, depending upon operating conditions. The
PCM varies the vapor flow rate by changing solenoid
pulse width. Pulse width is the amount of time the
solenoid energizes. The PCM adjusts solenoid pulse
width based on engine operating condition.
REMOVAL
The duty cycle solenoid is attached to a bracket
mounted to the right inner fender (Fig. 2).
(1) Disconnect electrical wiring connector at sole-
noid (Fig. 2).
(2) Disconnect vacuum harness at solenoid.
(3) Remove solenoid from support bracket.
INSTALLATION
(1) Install solenoid assembly to support bracket.
(2) Connect vacuum harness.
(3) Connect wiring connector.
Fig. 1 Fixed Orifice FittingÐ8.0L V-10 EngineÐ
Typical
1 - VACUUM TUBE
2 - FIXED ORIFICE FITTING
3 - COIL PACKS
4 - ORIFICE FITTING HOSE CONNECTIONS
25 - 32 EVAPORATIVE EMISSIONSBR/BE

Page 2820 of 2889

DODGE RAM 2001 Service Repair Manual FUEL FILLER CAP
DESCRIPTION
The plastic fuel tank filler tube cap is threaded
onto the end of the fuel fill tube. Certain models are
equipped with a 1/4 turn cap.
OPERATION
The loss of any fuel or vap

FUEL FILLER CAP
DESCRIPTION
The plastic fuel tank filler tube cap is threaded
onto the end of the fuel fill tube. Certain models are
equipped with a 1/4 turn cap.
OPERATION
The loss of any fuel or vapor out of fuel filler tube
is prevented by the use of a pressure-vacuum fuel fill
cap. Relief valves inside the cap will release fuel tank
pressure at predetermined pressures. Fuel tank vac-
uum will also be released at predetermined values.
This cap must be replaced by a similar unit if
replacement is necessary. This is in order for the sys-
tem to remain effective.
CAUTION: Remove fill cap before servicing any fuel
system component to relieve tank pressure. If
equipped with a Leak Detection Pump (LDP), the
cap must be tightened securely. If cap is left loose,
a Diagnostic Trouble Code (DTC) may be set.
REMOVAL/INSTALLATION
If replacement of the 1/4 turn fuel tank filler tube
cap is necessary, it must be replaced with an identi-
cal cap to be sure of correct system operation.CAUTION: Remove the fuel tank filler tube cap to
relieve fuel tank pressure. The cap must be
removed prior to disconnecting any fuel system
component or before draining the fuel tank.
LEAK DETECTION PUMP
DESCRIPTION
The Leak Detection Pump (LDP) is used only with
certain emission packages.
The LDP is a device used to detect a leak in the
evaporative system.
The pump contains a 3 port solenoid, a pump that
contains a switch, a spring loaded canister vent valve
seal, 2 check valves and a spring/diaphragm.
Immediately after a cold start, engine temperature
between 40ÉF and 86ÉF, the 3 port solenoid is briefly
energized. This initializes the pump by drawing air
into the pump cavity and also closes the vent seal.
During non-test test conditions, the vent seal is held
open by the pump diaphragm assembly which pushes
it open at the full travel position. The vent seal will
remain closed while the pump is cycling. This is due
to the operation of the 3 port solenoid which prevents
the diaphragm assembly from reaching full travel.
After the brief initialization period, the solenoid is
de-energized, allowing atmospheric pressure to enter
the pump cavity. This permits the spring to drive the
diaphragm which forces air out of the pump cavity
and into the vent system. When the solenoid is ener-
gized and de-energized, the cycle is repeated creating
flow in typical diaphragm pump fashion. The pump
is controlled in 2 modes:
PUMP MODE:The pump is cycled at a fixed rate
to achieve a rapid pressure build in order to shorten
the overall test time.
TEST MODE:The solenoid is energized with a
fixed duration pulse. Subsequent fixed pulses occur
when the diaphragm reaches the switch closure
point.
The spring in the pump is set so that the system
will achieve an equalized pressure of about 7.5 inches
of water.
When the pump starts, the cycle rate is quite high.
As the system becomes pressurized pump rate drops. If
there is no leak the pump will quit. If there is a leak,
the test is terminated at the end of the test mode.
If there is no leak, the purge monitor is run. If the
cycle rate increases due to the flow through the
purge system, the test is passed and the diagnostic is
complete.
The canister vent valve will unseal the system
after completion of the test sequence as the pump
diaphragm assembly moves to the full travel position.
A typical system schematic is shown in (Fig. 3).
Fig. 2 Duty Cycle EVAP Canister Purge Solenoid
Location
1 - RIGHT-FRONT FENDER
2 - LDP FILTER
3 - DUTY CYCLE SOLENOID
4 - ELEC. CONNEC.
5 - LEAK DETECTION PUMP (LDP) (IF EQUIPPED)
6 - LDP ELEC. CONNEC.
BR/BEEVAPORATIVE EMISSIONS 25 - 33
EVAP/PURGE SOLENOID (Continued)

Page 2821 of 2889

DODGE RAM 2001 Service Repair Manual REMOVAL
The LDP and LDP filter are attached to a bracket
mounted to the right-inner fender (Fig. 2). The LDP
and LDP filter are replaced (serviced) as one unit.
(1) Carefully remove hose at LDP filter

Page 2822 of 2889

DODGE RAM 2001 Service Repair Manual PCV FILTER
DESCRIPTION
The crankcase breather/filter is no longer used
with the 3.9L, 5.2L or 5.9L engine.
PCV VALVE
DESCRIPTION - V-6/V-8 ENGINES
All 3.9L V-6 and 5.2L/5.9L V-8 gas powered engines
ar

PCV FILTER
DESCRIPTION
The crankcase breather/filter is no longer used
with the 3.9L, 5.2L or 5.9L engine.
PCV VALVE
DESCRIPTION - V-6/V-8 ENGINES
All 3.9L V-6 and 5.2L/5.9L V-8 gas powered engines
are equipped with a closed crankcase ventilation sys-
tem and a positive crankcase ventilation (PCV) valve.
The 8.0L V-10 engine is not equipped with a PCV
valve. Refer to Crankcase Ventilation SystemÐ8.0L
V-10 Engine for information.
This system consists of a PCV valve mounted on
the cylinder head (valve) cover with a hose extending
from the valve to the intake manifold (Fig. 4).
Another hose connects the opposite cylinder head
(valve) cover to the air cleaner housing to provide a
source of clean air for the system. A separate crank-
case breather/filter is not used.
OPERATION - V-6/V-8 ENGINES
The PCV system operates by engine intake mani-
fold vacuum (Fig. 5). Filtered air is routed into the
crankcase through the air cleaner hose. The metered
air, along with crankcase vapors, are drawn through
the PCV valve and into a passage in the intake man-
ifold. The PCV system manages crankcase pressure
and meters blow by gases to the intake system,
reducing engine sludge formation.The PCV valve contains a spring loaded plunger.
This plunger meters the amount of crankcase vapors
routed into the combustion chamber based on intake
manifold vacuum.
When the engine is not operating or during an
engine pop-back, the spring forces the plunger back
against the seat (Fig 6). This will prevent vapors
from flowing through the valve.
During periods of high manifold vacuum, such as
idle or cruising speeds, vacuum is sufficient to com-
pletely compress spring. It will then pull the plunger
to the top of the valve (Fig. 7). In this position there
is minimal vapor flow through the valve.
During periods of moderate manifold vacuum, the
plunger is only pulled part way back from inlet. This
results in maximum vapor flow through the valve
(Fig. 8).
Fig. 4 Typical PCV Valve/Hose (Non±California
Shown)
1 - P C V VA LV E
2 - PCV VALVE HOSE CONNECTIONS
Fig. 5 Typical Closed Crankcase Ventilation System
1 - THROTTLE BODY
2 - AIR CLEANER
3 - AIR INTAKE
4 - P C V VA LV E
5 - COMBUSTION CHAMBER
6 - BLOW-BY GASES
7 - CRANKCASE BREATHER/FILTER
Fig. 6 Engine Off or Engine Pop-BackÐNo Vapor
Flow
BR/BEEVAPORATIVE EMISSIONS 25 - 35

Page 2823 of 2889

DODGE RAM 2001 Service Repair Manual DIAGNOSIS AND TESTING - PCV VALVE -
V±6/V±8 ENGINES
(1) With engine idling, remove the PCV valve from
cylinder head (valve) cover. If the valve is not
plugged, a hissing noise will be heard as air p

Page 2824 of 2889

DODGE RAM 2001 Service Repair Manual (5) Replace the PCV valve and retest the system if
it does not operate as described in the preceding
tests.Do not attempt to clean the old PCV valve.
(6) If the paper is not held against the opening i

(5) Replace the PCV valve and retest the system if
it does not operate as described in the preceding
tests.Do not attempt to clean the old PCV valve.
(6) If the paper is not held against the opening in
valve cover after new valve is installed, the PCV
valve hose may be restricted and must be replaced.
The passage in the intake manifold must also be
checked and cleaned.
(7) To clean the intake manifold fitting, turn a 1/4
inch drill (by hand) through the fitting to dislodge
any solid particles. Blow out the fitting with shop air.
If necessary, use a smaller drill to avoid removing
any metal from the fitting.
VACUUM LINES
DIAGNOSIS AND TESTING - VACUUM
SCHEMATICS
A vacuum schematic for emission related items can
be found on the VECI label. Refer to Vehicle Emis-
sion Control Information (VECI) Label in this group
for label location.
VAPOR CANISTER
DESCRIPTION
Two, maintenance free, EVAP canisters are used
with all 3.9L/5.2L/5.9L/8.0L gasoline powered
engines. Both canisters are mounted to a bracket
located below rear of vehicle cab on outside of right
frame rail (Fig. 12).
OPERATION
Two, maintenance free, EVAP canisters are used
with all 3.9L/5.2L/5.9L/8.0L gasoline powered
engines.The EVAP canisters are filled with granules
of an activated carbon mixture. Fuel vapors entering
the EVAP canisters are absorbed by the charcoal
granules.
Fuel tank pressure vents into the EVAP canisters.
Fuel vapors are temporarily held in the canisters
until they can be drawn into the intake manifold.
The duty cycle EVAP canister purge solenoid allows
the EVAP canisters to be purged at predetermined
times and at certain engine operating conditions.
REMOVAL
Two EVAP canisters are used. Both canisters are
mounted to a bracket located below rear of vehicle
cab on outside of right frame rail (Fig. 13).
(1) Remove fuel tubes/lines at each EVAP canister.
Note location of tubes/lines before removal for easier
installation.(2) Remove mounting nuts at each canister (Fig.
13).
(3) Remove each canister from mounting bracket.
Fig. 12 Location of EVAP Canisters
1 - MOUNTING NUTS
2 - FRAME RAIL (RIGHT)
3 - FRONT EVAP CANISTER
4 - REAR EVAP CANISTER
Fig. 13 EVAP Canister Location
1 - MOUNTING NUTS
2 - FRAME RAIL (RIGHT)
3 - FRONT EVAP CANISTER
4 - REAR EVAP CANISTER
BR/BEEVAPORATIVE EMISSIONS 25 - 37
PCV VALVE (Continued)

Load next 8 pages

Page: < prev 1-10 ... 2785-2792 2793-2800 2801-2808 2809-2816 2817-2824 2825-2832 2833-2840 2841-2848 2849-2856 ... 2896 next >

night vision four wheel drive reset clock setting rims dead battery open trunk