1998 DODGE RAM 1500 OBD port

EVAPORATIVE EMISSIONS
TABLE OF CONTENTS
page page
EVAPORATIVE EMISSIONS
DESCRIPTION - EVAP SYSTEM............10
SPECIFICATIONS
TORQUE - EVAP SYSTEM...............11
CCV HOSE
DESCRIPTION - 8.0L V-10................12
OPERATION - 8.0L V-10..................12
EVAP/PURGE SOLENOID
DESCRIPTION.........................12
OPERATION...........................12
REMOVAL.............................12
INSTALLATION.........................12
FUEL FILLER CAP
DESCRIPTION.........................13
OPERATION...........................13
REMOVAL
REMOVAL/INSTALLATION...............13
LEAK DETECTION PUMP
DESCRIPTION.........................13
OPERATION...........................14
REMOVAL.............................16
INSTALLATION.........................16ORVR
DESCRIPTION.........................17
OPERATION...........................17
P C V VA LV E
DESCRIPTION.........................17
OPERATION...........................19
DIAGNOSIS AND TESTING - PCV VALVE -
3.7L V-6/ 4.7L V-8......................20
REMOVAL.............................21
INSTALLATION.........................21
VACUUM LINES
DESCRIPTION.........................22
VAPOR CANISTER
DESCRIPTION.........................22
OPERATION...........................22
REMOVAL.............................22
INSTALLATION.........................22
NATURAL VAC LEAK DETECTION ASSY
DESCRIPTION.........................23
OPERATION...........................23
REMOVAL.............................24
INSTALLATION.........................25
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 gasoline powered engines use a duty cycle
purge system. The PCM controls vapor flow by oper-
ating the duty cycle EVAP purge solenoid. Refer to
Duty Cycle EVAP Canister Purge Solenoid for addi-
tional 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 a part
of OBD II requirements. Refer to Leak Detection
Pump for additional information. Other emissions
packages will use a Natural Vacuum Leak Detection
(NVLD) system in place of the LDP. Refer to NVLD
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.
Certain EVAP system components can be found in
(Fig. 1).
25 - 10 EVAPORATIVE EMISSIONSDR

NV243 - TRANSFER CASE.......21-505,21-506
NV244 - DIAGNOSIS AND TESTING,
TRANSFER CASE....................21-513
NV244 GENII - ASSEMBLY, TRANSFER
CASE.............................21-525
NV244 GENII - CLEANING, TRANSFER
CASE.............................21-523
NV244 GENII - DESCRIPTION, TRANSFER
CASE.............................21-512
NV244 GENII - DISASSEMBLY,
TRANSFER CASE....................21-514
NV244 GENII - INSPECTION, TRANSFER
CASE.............................21-523
NV244 GENII - INSTALLATION,
TRANSFER CASE....................21-534
NV244 GENII - OPERATION, TRANSFER
CASE.............................21-513
NV244 GENII - REMOVAL, TRANSFER
CASE.............................21-514
NV244 GENII - TRANSFER CASE........21-535
NV271 - ASSEMBLY, TRANSFER CASE . . . 21-461
NV271 - CLEANING, TRANSFER CASE . . . 21-459
NV271 - DESCRIPTION, TRANSFER CASE . 21-447
NV271 - DIAGNOSIS AND TESTING,
TRANSFER CASE....................21-448
NV271 - DISASSEMBLY, TRANSFER
CASE.............................21-450
NV271 - INSPECTION, TRANSFER CASE . . 21-459
NV271 - INSTALLATION, TRANSFER
CASE.............................21-473
NV271 - OPERATION, TRANSFER CASE . . 21-448
NV271 - REMOVAL, TRANSFER CASE....21-450
NV271 - TRANSFER CASE.............21-473
NV271/NV273, SPECIAL TOOLS -
TRANSFER CASE..............21-474,21-569
NV273 - ASSEMBLY, TRANSFER CASE . . . 21-556
NV273 - CLEANING, TRANSFER CASE . . . 21-554
NV273 - DESCRIPTION, TRANSFER CASE . 21-542
NV273 - DIAGNOSIS AND TESTING,
TRANSFER CASE....................21-543
NV273 - DISASSEMBLY, TRANSFER
CASE.............................21-544
NV273 - INSPECTION, TRANSFER CASE . . 21-554
NV273 - INSTALLATION, TRANSFER
CASE.............................21-568
NV273 - OPERATION, TRANSFER CASE . . 21-543
NV273 - REMOVAL, TRANSFER CASE....21-544
NV273 - TRANSFER CASE.............21-568
NV3500 - ASSEMBLY, MANUAL
TRANSMISSION......................21-17
NV3500 - CLEANING, MANUAL
TRANSMISSION......................21-15
NV3500 - DESCRIPTION, MANUAL
TRANSMISSION.......................21-1
NV3500 - DIAGNOSIS AND TESTING,
MANUAL TRANSMISSION...............21-3
NV3500 - DISASSEMBLY, MANUAL
TRANSMISSION.......................21-4
NV3500 - INSPECTION, MANUAL
TRANSMISSION......................21-16
NV3500 - INSTALLATION, MANUAL
TRANSMISSION......................21-39
NV3500 - OPERATION, MANUAL
TRANSMISSION.......................21-1
NV3500 - REMOVAL, MANUAL
TRANSMISSION.......................21-3
NV3500 - SPECIAL TOOLS, MANUAL
TRANSMISSION......................21-40
NV3500 - SPECIFICATIONS, MANUAL
TRANSMISSION......................21-40
NV4500 - ASSEMBLY, MANUAL
TRANSMISSION......................21-63
NV4500 - CLEANING, MANUAL
TRANSMISSION......................21-62
NV4500 - DESCRIPTION, MANUAL
TRANSMISSION......................21-43
NV4500 - DIAGNOSIS AND TESTING,
MANUAL TRANSMISSION..............21-44
NV4500 - DISASSEMBLY, MANUAL
TRANSMISSION
......................21-46
NV4500 - INSPECTION, MANUAL
TRANSMISSION
......................21-62
NV4500 - INSTALLATION, MANUAL
TRANSMISSION
......................21-80
NV4500 - OPERATION, MANUAL
TRANSMISSION
......................21-43
NV4500 - REMOVAL, MANUAL
TRANSMISSION
......................21-44NV4500 - SPECIAL TOOLS, MANUAL
TRANSMISSION......................21-81
NV4500 - SPECIFICATIONS, MANUAL
TRANSMISSION......................21-81
NV5600 - ASSEMBLY, MANUAL
TRANSMISSION.....................21-106
NV5600 - DESCRIPTION, MANUAL
TRANSMISSION......................21-88
NV5600 - DIAGNOSIS AND TESTING,
MANUAL TRANSMISSION..............21-90
NV5600 - DISASSEMBLY, MANUAL
TRANSMISSION......................21-91
NV5600 - INSPECTION, MANUAL
TRANSMISSION.....................21-106
NV5600 - INSTALLATION, MANUAL
TRANSMISSION.....................21-121
NV5600 - OPERATION, MANUAL
TRANSMISSION......................21-90
NV5600 - REMOVAL, MANUAL
TRANSMISSION......................21-90
NV5600 - SPECIAL TOOLS, MANUAL
TRANSMISSION.....................21-123
NV5600 - SPECIFICATIONS............21-123
ODOMETER - DESCRIPTION............8J-32
ODOMETER - OPERATION..............8J-32
OIL - DESCRIPTION, REFRIGERANT......24-68
OIL - DIESEL ENGINES - DESCRIPTION,
ENGINE..............................0-2
OIL - OPERATION, REFRIGERANT........24-69
OIL AND LUBRICANTS - DESCRIPTION,
ENGINE..............................0-1
OIL COOLER - INSTALLATION, AIR TO......7-70
OIL COOLER - REMOVAL, AIR TO.........7-69
OIL COOLER - REMOVAL, WATER TO......7-69
OIL FILTER - INSTALLATION . 9-155,9-223,9-293,
9-70
OIL FILTER - REMOVAL . 9-154,9-223,9-293,9-70
OIL LEAK - DIAGNOSIS AND TESTING,
ENGINE...................9-152,9-220,9-64
OIL LEVEL - STANDARD PROCEDURE,
ENGINE............................9-292
OIL LEVEL - STANDARD PROCEDURE,
REFRIGERANT.......................24-69
OIL PAN - CLEANING.............9-293,9-66
OIL PAN - DESCRIPTION................9-66
OIL PAN - INSPECTION............9-293,9-66
OIL PAN - INSTALLATION . . . 9-155,9-224,9-293,
9-66
OIL PAN - REMOVAL....9-155,9-224,9-293,9-66
OIL PRESSURE - DIAGNOSIS AND
TESTING, CHECKING ENGINE . . 9-152,9-220,9-65
OIL PRESSURE - DIAGNOSIS AND
TESTING, ENGINE....................9-289
OIL PRESSURE GAUGE - DESCRIPTION . . . 8J-33
OIL PRESSURE GAUGE - OPERATION.....8J-33
OIL PRESSURE RELIEF VALVE -
CLEANING..........................9-294
OIL PRESSURE RELIEF VALVE -
INSPECTION........................9-294
OIL PRESSURE RELIEF VALVE -
INSTALLATION.......................9-294
OIL PRESSURE RELIEF VALVE -
REMOVAL..........................9-294
OIL PRESSURE SENSOR/SWITCH -
DESCRIPTION........................9-67
OIL PRESSURE SENSOR/SWITCH -
INSTALLATION........................9-67
OIL PRESSURE SENSOR/SWITCH -
OPERATION..........................9-67
OIL PRESSURE SENSOR/SWITCH -
REMOVAL...........................9-67
OIL PRESSURE SWITCH - INSTALLATION . 9-294
OIL PRESSURE SWITCH - REMOVAL.....9-294
OIL PUMP - ASSEMBLY...........9-158,9-69
OIL PUMP - ASSEMBLY........21-214,21-390
OIL PUMP - CLEANING......9-157,9-224,9-295
OIL PUMP - CLEANING.........21-214,21-390
OIL PUMP - DESCRIPTION......21-213,21-386
OIL PUMP - DISASSEMBLY........9-157,9-68
OIL PUMP - DISASSEMBLY......21-214,21-388
OIL PUMP - INSPECTION....9-157,9-224,9-295,
9-68
OIL PUMP - INSPECTION
.......21-214,21-390
OIL PUMP - INSTALLATION
. . 9-159,9-225,9-296,
9-69
OIL PUMP - OPERATION
........21-213,21-386
OIL PUMP - REMOVAL
. . 9-156,9-224,9-294,9-67
OIL PUMP FRONT SEAL - INSTALLATION
. 21-391OIL PUMP FRONT SEAL - REMOVAL....21-391
OIL PUMP VOLUME CHECK - STANDARD
PROCEDURE.......................21-387
OIL SEAL - FRONT - INSTALLATION,
CRANKSHAFT.........9-136,9-208,9-275,9-46
OIL SEAL - FRONT - REMOVAL,
CRANKSHAFT.........9-135,9-208,9-275,9-46
OIL SEAL - REAR - INSTALLATION,
CRANKSHAFT.........9-138,9-209,9-276,9-47
OIL SEAL - REAR - REMOVAL,
CRANKSHAFT.........9-137,9-209,9-276,9-47
OIL SEAL RETAINER - INSTALLATION,
CRANKSHAFT REAR.............9-210,9-277
OIL SEAL RETAINER - REMOVAL,
CRANKSHAFT REAR.............9-209,9-277
OIL SERVICE - STANDARD PROCEDURE,
ENGINE..............9-153,9-222,9-292,9-71
ON-BOARD DIAGNOSTICS (OBD) -
DIAGNOSIS AND TESTING...............7-5
ON/OFF RELAY - DESCRIPTION, WIPER . . . 8R-24
ON/OFF RELAY - DIAGNOSIS AND
TESTING, WIPER.....................8R-25
ON/OFF RELAY - INSTALLATION, WIPER . . 8R-26
ON/OFF RELAY - OPERATION, WIPER....8R-25
ON/OFF RELAY - REMOVAL, WIPER......8R-26
ON/OFF SWITCH - DESCRIPTION,
PASSENGER AIRBAG.................8O-42
ON/OFF SWITCH - INSTALLATION,
PASSENGER AIRBAG.................8O-44
ON/OFF SWITCH - OPERATION,
PASSENGER AIRBAG.................8O-43
ON/OFF SWITCH - REMOVAL,
PASSENGER AIRBAG.................8O-43
OPEN-CIRCUIT VOLTAGE TEST -
STANDARD PROCEDURE...............8F-10
OPENING COVER - INSTALLATION,
STEERING COLUMN..................23-60
OPENING COVER - REMOVAL, STEERING
COLUMN...........................23-60
OPENING DIMENSIONS -
SPECIFICATIONS, BODY...............23-99
OPENING SEAL - INSTALLATION, DOOR . . . 23-92
OPENING SEAL - REMOVAL, DOOR......23-92
OPENING SUPPORT BRACKET -
INSTALLATION, STEERING COLUMN......23-60
OPENING SUPPORT BRACKET -
REMOVAL, STEERING COLUMN.........23-60
OPERATING MODES, STANDARD
PROCEDURE - CONFIGURING A NEW
MODULE / SWITCH....................8Q-3
ORDER / CABLE ROUTING, 5.7L V-8
ENGINE - FIRING......................8I-4
ORDER, 3.7L V-6 - ENGINE FIRING........8I-4
ORDER, 4.7L V-8 - ENGINE FIRING........8I-4
ORDER, DIESEL - FUEL INJECTOR
FIRING.............................14-48
ORIFICE TUBE - DESCRIPTION, A/C......24-60
ORIFICE TUBE - DIAGNOSIS AND
TESTING, A/C.......................24-61
ORIFICE TUBE - OPERATION, A/C........24-60
ORVR - DESCRIPTION.................25-17
ORVR - OPERATION..................25-17
OUTBOARD - INSTALLATION, CENTER &
LEFT..............................8O-50
OUTBOARD - INSTALLATION, CENTER
ANCHOR & RIGHT...................8O-50
OUTBOARD - REMOVAL, CENTER & LEFT . 8O-48
OUTBOARD - REMOVAL, CENTER
ANCHOR & RIGHT...................8O-49
OUTBOARD SEAT BELT & RETRACTOR -
INSTALLATION, REAR.................8O-47
OUTBOARD SEAT BELT & RETRACTOR -
REMOVAL, REAR....................8O-46
OUTBOARD SEAT BELT BUCKLE -
INSTALLATION, FRONT................8O-38
OUTBOARD SEAT BELT BUCKLE -
REMOVAL, FRONT....................8O-37
OUTER BELT MOLDING - INSTALLATION,
FRONT DOOR.......................23-93
OUTER BELT MOLDING - INSTALLATION,
REAR DOOR
........................23-94
OUTER BELT MOLDING - REMOVAL,
FRONT DOOR
.......................23-92
OUTER BELT MOLDING - REMOVAL,
REAR DOOR
........................23-93
OUTER TIE ROD END - DIAGNOSIS AND
TESTING
...........................19-32
OUTER TIE ROD END - INSTALLATION
....19-33
22 INDEXDR
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