1999 DODGE RAM gas mileage
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![DODGE RAM 1999 Service Repair Manual
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Refrigerant A/C System Capacity 7.75 Oz. (230ML)
Oil
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Fuel Tank Capacity 35 Gal. (132L)
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(
1) - Capacities are recommended or calculated levels. Always use
dipstick (if available) to measure level.
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LUBRICATION SPECIFICATIONS - GAS
LUBRICATION SPECIFICATIONS TABLE - GAS \
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Material Condition Specification
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Engine Oil Ambient Temperature Above 0 \bF SAE 10W-30
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1) (-18\bC) To Over 100\bF (38\bC)
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Ambient Temperature Less Than SAE 5W-30
-20\bF (-29\bC) Up To 32\bF (0\bC)
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Engine All 50/50 Mixture Of
Coolant Distilled Water &
Ethylene Glycol
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Brake Fluid All DOT 3
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Automatic All ATF+2 Type 7176
Transmission
Fluid
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Transfer Case All ATF+2 Type 7176
Fluid Or DEXRON III ATF
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Manual NV-4500 75W-90 Synthc. API GL4
Transmission
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Fluid NV-3500 Mopar Manual
Transmission Fluid
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Steering All Mopar Multi-Mileage
Linkage Lubricant
Lubricant
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Wheel Bearing All High Temperature Multi-
Grease -Purporse EP Grease
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Rear Axle & All Mopar Hypoid Lubricant
4x4 Frt. Axle SAE 80W-90
Lubricant (
2) GL-5 Gear Lube
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Power All Mopar Power Steering
Steering Fluid Or Equivalant
Fluid (
3) Petroleum Based
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Clutch All Multipurpose Grease
Linkage NLGI Grade 2 E.P.
Lubricant
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A/C All R-134a
Page 942 of 1691
N - R EM OVE/IN STA LL/O VER HAU L - R W D - G ASO LIN E
1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - Removal, Overhaul & Installation - Gasoline
Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon
CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION
before disconnecting battery.
INTRODUCTION
Removal, overhaul and installation procedures are covered in
this article. If component removal and installation is basically an
unbolt and bolt-on procedure, only a torque specification may be
provided.
COMPUTERIZED ENGINE CONTROLS
POWERTRAIN CONTROL MODULE (PCM)
NOTE: If replacing Powertrain Control Module (PCM), the correct
vehicle mileage and Vehicle Identification Number (VIN) must
be programmed into the PCM to prevent Diagnostic Trouble
Codes (DTCs) from being set in the Anti-Lock Brake System
(ABS) module and Supplemental Restraint System (SRS) module\
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To program PCM and clear DTCs from ABS and SRS modules, see
PCM PROGRAMMING. If replacing Powertrain Control Module (PCM)\
on models equipped with a Smart Key Immobilizer Module
(SKIM), the secret key data must also be updated to enable
engine starting. To update secret key data, see PCM
PROGRAMMING.
Removal & Installation
1) PCM is located in the engine compartment. See Figs. 1-3.
Disconnect negative battery cable. Remove cover for access to
electrical connectors at PCM. Disconnect electrical connectors from
PCM. Remove PCM retaining bolts and PCM.
2) To install, reverse removal procedure. Tighten PCM
retaining bolts to specification. See TORQUE SPECIFICATIONS.
Fig. 1: Locating PCM (Dakota & Durango)
Courtesy of Chrysler Corp.
Page 1029 of 1691
SC HED ULE D S ER VIC ES - N O RM AL S ER VIC E ( G AS)
1 999 D odge P ic ku p R 1500
1997-99 MAINTENANCE
Chrysler Maintenance & Service Intervals
Gasoline Engines
Normal Service/Light Duty Trucks
DODGE; RAM PICKUP 1500: 3.9L VIN [X]
DODGE; RAM PICKUP 1500/2500: 5.2L VIN [Y]
DODGE; RAM PICKUP 1500/2500: 5.2L VIN [T]
DODGE; RAM PICKUP 1500/2500: 5.9L VIN [Z]
* READ THIS FIRST *
Before preforming maintenance on vehicle, ensure that all
cautions and warnings have been observed to prevent vehicle damage or
personal injury. See CAUTIONS & WARNINGS in MAINTENANCE INFORMATION
article in this section.
Introduction
The frequency of scheduled inspection and maintenance
services in this article are based on normal vehicle usage ONLY. The
following Severe conditions are NOT taken into account:
* Frequent short driving less than 5 Miles (8 Km).
* Frequent driving in dusty conditions.
* Frequent trailer towing.
* Extensive idling.
* More than 50% of your driving is at sustained high speeds
during hot weather, above 90
F (32 C).
If the vehicle is operated mainly under any of these
conditions, this Normal service schedule article is inadequate. DO NOT
USE. Instead, use the Severe service schedule: See
SCHEDULED SERVICES - SEVERE SERVICE (GAS) .
7,500 MILE (12,000 KM)/6 MONTH NORMAL SERVICE
7,500 MILE (12,000 KM)/6 MONTH NORMAL SERVICE\
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INSPECT
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Exhaust System
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Brake Hoses
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Engine Coolant Level, Hoses & Clamps
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SERVICE
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Rotate Tires
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Lubricate Steering Linkage
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REPLACE
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Engine Oil (
1)
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(
1) - If mileage is less than 7,500 miles (12,000 KM) yearly,
replace the oil filter at every oil change.
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Page 1184 of 1691
Normal Service .......................... 6 ............... 7500
Severe Service ......................... (3) .............. 3000
Engine Oil Filter
Normal Service .......................... 12 ............ 15,000
Severe Service ......................... ( 3) .............. 6000
PCV Valve ( 6)
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 3) ............ 30,000
Spark Plugs
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 3) ............ 30,000
Spark Plug Wires
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 3) ............ 60,000
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 3) ............ 12,000
Manual Transmission Fluid ................ ( 7) ............... ( 7)
Transfer Case Fluid (4WD)
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 3) ............ 36,000
Front Differential Fluid (4WD) ( 8)
Severe Service ......................... ( 3) ............ 12,000
Rear Differential Fluid ( 8)
Severe Service ......................... ( 3) ............ 12,000
Repack Front Wheel Bearings (2WD)
Normal Service .......................... 18 ............ 22,500
Severe Service ......................... ( 3) ............ 21,000
( 1) - Light-duty vehicles apply to all 1500 models and 2500 except
5.9L diesel or 8.0L engines.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 45,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - Inspect at scheduled interval and replace as necessary.
( 7) - Service interval is not available from manufacturer.
( 8) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM-DUTY - GASOLINE) ( 1)( 2) \
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Component Months Miles
Air Filter
Normal Service ...................... 30 ................ 30,000
Severe Service ...................... ( 3) ........... ( 4) 15,000
Coolant ............................... ( 5) .................. ( 5)
Engine Oil & Filter
Normal Service ....................... 6 .................. 6000
Severe Service ...................... ( 3) ................. 3000
Page 1185 of 1691
Spark Plugs
Normal Service ...................... 30 ................ 30,000
Severe Service ...................... (3) ............... 30,000
Spark Plug Wires
Normal Service ...................... 60 ................ 60,000
Severe Service ...................... ( 3) ............... 60,000
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service ...................... 24 ................ 24,000
Severe Service ...................... ( 3) ............... 12,000
Manual Transmission Fluid ............. ( 6) .................. ( 6)
Transfer Case Fluid (4WD)
Normal Service ...................... 36 ................ 36,000
Severe Service ...................... ( 3) ............... 36,000
Front Differential Fluid (4WD) ( 7)
Severe Service ...................... ( 3) ............... 12,000
Rear Differential Fluid ( 7)
Severe Service ...................... ( 3) ............... 12,000
Repack Front Wheel Bearings (2WD)
Normal Service ....................... 18 ............... 18,000
Severe Service ...................... ( 3) ............... 24,000
( 1) - Medium-duty vehicles apply to 2500 and 3500 Calif. models with
8.0L engine.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 36,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - Service interval is not available from manufacturer.
( 7) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM PICKUP - HEAVY-DUTY - GASOLINE) ( 1)( 2) \
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Component Months Miles
Air Filter
5.9L
Normal Service .................... 24 ................. 24,000
Severe Service ................... ( 3) ............. ( 4) 12,000
8.0L ............................... 12 ................. 12,000
Air Injection Pump Filter
Normal Service ..................... 24 ................. 24,000
Severe Service .................... ( 3) ............. ( 4) 12,000
Coolant ............................. ( 5) .................... ( 5)
EGR Valve (5.9L Only) ( 6)
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Engine Oil
Normal Service ..................... 6 .................... 6000
Severe Service .................... ( 3) ................... 3000
Engine Oil Filter
Page 1186 of 1691
5.9L
Normal Service .................... 12 ................. 12,000
Severe Service ................... (3) ................... 6000
8.0L
Normal Service .................... 6 .................... 6000
Severe Service ................... ( 3) ................... 3000
PCV Valve (5.9L Only)
Normal Service ..................... 60 ................. 60,000
Severe Service ( 7) ................ ( 3) ................. 30,000
Distributor Cap & Rotor (5.9L Only)
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Spark Plugs
Normal Service ..................... 30 ................. 30,000
Severe Service .................... ( 3) ................. 30,000
Spark Plug Wires
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Oxygen Sensor (5.9L Only)
Normal Service ..................... 82 ................. 82,500
Severe Service ..................... ( 3) ................ 82,500
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service ..................... 24 ................. 24,000
Severe Service ..................... ( 3) ................ 12,000
Manual Transmission Fluid ............ ( 8) ................... ( 8)
Transfer Case Fluid (4WD)
Normal Service ..................... 36 ................. 36,000
Severe Service ..................... ( 3) ................ 18,000
Front Differential Fluid (4WD) ( 9)
Severe Service ..................... ( 3) ................ 12,000
Rear Differential Fluid ( 9) .......... ( 3) ................ 12,000
Repack Front Wheel Bearings
2WD
Normal Service .................... 24 ................. 24,000
Severe Service .................... ( 3) .................. 9000
4WD
Normal Service .................... 18 ................. 18,000
Severe Service .................... ( 3) .................. 6000
( 1) - Heavy-duty vehicles apply to 2500 and 3500 Federal models with
8.0L engine and all 3500 models with 5.9L gasoline engine.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect filter every 12,000 miles and replace as necessary.
Replace at 24,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 36,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - If equipped with EGR valve, clean EGR passages when replacing
EGR valve.
( 7) - Inspect and replace as necessary. Replace PCV valve at 60,000
miles.
( 8) - Service interval is not available from manufacturer.
( 9) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
Page 1200 of 1691
IDLE SPEED & MIXTURE
NOTE: On all except diesel models, idle speed and mixture are
controlled by Powertrain Control Module (PCM). No adjustment
is required.
IDLE SPEED SPECIFICATIONS
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Application RPM
Gasoline Models ................................................ ( 1)
Diesel Models .................................................. ( 2)
( 1) - Idle speed is controlled by Powertrain Control Module PCM) and
idle air control motor. Idle speed is nonadjustable.
( 2) - Idle speed is controlled by PCM. Idle speed is nonadjustable.
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THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED SPECIFICATIONS \
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Application RPM
Caravan
2.4L ( 2)
1000 Miles Or Less .................................. ( 3) 500-875
More Than 1000 Miles ................................ ( 3) 550-875
3.0L ( 2)
1000 Miles Or Less .................................. ( 3) 560-910
More Than 1000 Miles ................................ ( 3) 610-910
3.3L & 3.8L ( 2)
1000 Miles Or Less .................................. ( 3) 525-875
More Than 1000 Miles ................................ ( 3) 575-875
Dakota
2.5L ..................................................... 500-900
3.9L, 5.2L & 5.9L .................................... ( 1) 500-900
Durango ................................................ ( 1) 500-900
Ram Pickup
3.9L, 5.2L & 5.9L (Gasoline) ......................... ( 1) 500-900
8.0L ......................................................... ( 4)
Ram Van & Ram Wagon .................................... ( 1) 500-900
Town & Country ( 2)
1000 Miles Or Less ................................... ( 3) 525-875
More Than 1000 Miles ................................. ( 3) 575-875
Voyager
2.4L ( 2)
1000 Miles Or Less .................................. ( 3) 500-875
More Than 1000 Miles ................................ ( 3) 550-875
3.0L ( 2)
1000 Miles Or Less .................................. ( 3) 560-910
More Than 1000 Miles ................................ ( 3) 610-910
3.3L ( 2)
1000 Miles Or Less .................................. ( 3) 525-875
More Than 1000 Miles ................................ ( 3) 575-875
( 1) - Specification listed with Air Metering Fitting (6714) installed.
( 2) - Specification listed in accordance with vehicle mileage.
( 3) - Specification listed with Air Metering Fitting (6457) installed.
( 4) - Does not apply to this application.
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THROTTLE POSITION SENSOR
Page 1485 of 1691
Crankcase Ventilation (PCV) system, but does not use a vacuum
controlled valve. See POSITIVE CRANKCASE VENTILATION (PCV).
EVAPORATIVE (EVAP) EMISSIONS SYSTEM
This system stores fuel vapors from fuel tank, preventing
vapors from reaching the atmosphere. As fuel evaporates inside fuel
tank, vapors are routed through vent hoses to charcoal canister where
they are stored until engine is started.
Evaporative Canister Purge Control Solenoid (EVAP-CPCS)
Charcoal canister purging is controlled by PCM through an
EVAP-CPCS. During engine warm-up and for a short period after hot
restarts, PCM energizes EVAP-CPCS, interrupting engine vacuum signal
to charcoal canister.
After engine reaches a predetermined operating temperature
and PCM internal timer has expired, PCM will de-energize EVAP-CPCS,
allowing engine vacuum to purge charcoal canister. EVAP-CPCS will also
be de-energized during certain idle conditions so PCM can update fuel
delivery calibration.
POSITIVE CRANKCASE VENTILATION (PCV)
PCV system uses a vacuum operated valve. A closed engine
crankcase breather/filter, with a hose connecting it to air filter
housing, provides source of air for system. Crankcase blow-by gases
are removed from crankcase through PCV valve with manifold vacuum.
These gases are introduced into incoming air/fuel mixture and become
part of the calibrated mixture.
A non-vacuum operated Crankcase Ventilation (CCV) system is
used on some engines, see CRANKCASE VENTILATION (CCV) SYSTEM.
SELF-DIAGNOSTIC SYSTEM
The PCM monitors several different circuits of engine control
system. If a problem is sensed with a monitored circuit, PCM will
store a Diagnostic Trouble Code (FTC) to aid technician in diagnosis
of system. The Malfunction Indicator Light (MIL), or a scan tool can
be used to read DTCs. For additional information, see SELF-DIAGNOSTICS
- JEEP, TRUCKS & RWD VANS article.
MALFUNCTION INDICATOR LIGHT
Malfunction Indicator Light (MIL) comes on and remains on for\
3 seconds as a bulb test each time ignition switch is turned to ON
position. If PCM receives an incorrect signal or receives no signal
from battery voltage input, charging system, ECT sensor, MAP sensor or
TP sensor, MIL will come on. MIL will also come on if certain
emission-related faults exist. This warns driver that PCM is in limp-
in mode and immediate repairs are necessary. See LIMP-IN MODE under
MISCELLANEOUS CONTROLS. MIL can also be used to display Diagnostic
Trouble Codes (DTCs). For additional information, see SELF-DIAGNOSTICS\
- JEEP, TRUCKS & RWD VANS article.
SERIAL COMMUNICATIONS INTERFACE (SCI)
SCI circuit is used by PCM to send data to and receive data
and sensor activation signals from scan tool. Scan tool uses signals
sent on SCI to display fault messages or Diagnostic Trouble Codes
(DTCs), sensor voltages and device states (On/Off). Scan tool uses S\
CI
to send solenoid and switch activation commands to PCM so that devices
and circuits can be tested. SCI is also used to write SRI mileage to