1999 DODGE RAM engine coolant
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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 1187 of 1691
![DODGE RAM 1999 Service Repair Manual \
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM & H](/manual-img/12/56915/w960_56915-1186.png "DODGE RAM 1999 Service Repair Manual \
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM & H")
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM & HEAVY DUTY - 5.9L
DIESEL) (1)
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Component Months Miles
Air Filter ............................... ( 2) ............... ( 2)
Coolant .................................. ( 3) ............... ( 3)
Engine Oil & Filter
Normal Service .......................... 6 ............... 7500
Severe Service ......................... ( 4) .............. 3750
Fuel Filter
Normal Service .......................... 12 ............ 15,000
Severe Service ......................... ( 4) .............. 7500
Valve Clearance Adjustment ............... ( 5) ............... ( 5)
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 4) ............ 15,000
Manual Transmission Fluid ................ ( 6) ............... ( 6)
Transfer Case Fluid (4WD)
Normal Service .......................... 36 ............ 45,000
Severe Service ......................... ( 4) ............ 36,000
Front Differential Fluid (4WD) ( 7)
Severe Service ......................... ( 4) ............ 15,000
Rear Differential Fluid ( 7)
Severe Service ......................... ( 4) ............ 15,000
Repack Front Wheel Bearings (2WD)
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 4) ............ 30,000
Normal Service .......................... 48 ............ 48,000
Severe Service ......................... ( 4) ............ 48,000
( 1) - 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.
( 2) - Service interval is not available from manufacturer. Use filter-
minder on top of air cleaner housing to determine condition of
air filter. If filter-minder is in the Red zone, replace air
filter. Reset filter-minder by depressing button on top of
filter-minder.
( 3) - Replace coolant at 30,000 miles or 24 months whichever occurs
first. Replace coolant at 24 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 4) - Monthly interval is not available from manufacturer.
( 5) - Does not require routine adjustments.
( 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 VAN & RAM WAGON) ( 1) \
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Component Months Miles
Air Filter
Normal Service ................... 24 ................... 30,000
Severe Service ................... ( 2) .............. ( 3) 15,000
Page 1188 of 1691
Coolant ............................ (4) ..................... ( 4)
Engine Oil
Normal Service .................... 6 ..................... 7500
Severe Service ................... ( 2) .................... 3000
Engine Oil Filter
Normal Service ................... 12 ................... 15,000
Severe Service ................... ( 2) .................... 6000
PCV Valve ( 5)
Normal Service ................... 48 ................... 60,000
Severe Service ................... ( 2) .................. 30,000
Spark Plugs
Normal Service ................... 24 ................... 30,000
Severe Service ................... ( 2) .................. 30,000
Spark Plug Wires
Normal Service ................... 48 ................... 60,000
Severe Service ................... ( 2) .................. 60,000
Automatic Transaxle Fluid,
Filter & Band Adjustment .......... ( 6) ..................... ( 6)
Rear Differential Fluid ( 7)
Severe Service ................... ( 2) .................. 12,000
Repack Front Wheel Bearings
Normal Service ................... 18 ................... 22,500
Severe Service ................... ( 2) .................. 21,000
( 1) - 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, or operating in dusty or excessively hot
conditions.
( 2) - Monthly interval is not available from manufacturer.
( 3) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 4) - 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.
( 5) - Inspect at scheduled interval and replace as necessary.
( 6) - Normal service interval is not available from manufacturer.
Under severe service, change fluid, filter and adjust bands
every 12,000 miles.
( 7) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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BELT ADJUSTMENT (Tension In Lbs. (kg) Using Belt Tension Gauge) \
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Application New Belt (1) Used Belt
Caravan
2.4L
A/C & Generator ...................... 190 (86) ...... 115 (52\
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Power Steering ....................... 140 (64) ....... 90 (41\
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3.0L
A/C .................................. 150 (68) ....... 80 (36\
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Generator & Power Steering ............. ( 2) .............. ( 2)
3.3L & 3.8L ............................. ( 2) .............. ( 2)
Dakota
2.5L .................................. 200 (91) ...... 160 (73\
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3.9L, 5.2L & 5.9L ....................... ( 2) .............. ( 2)
Durango
3.9L, 5.2L & 5.9L ....................... ( 2) .............. ( 2)
Page 1392 of 1691
I - S YSTE M /C O M PO NEN T T E STS - R W D - G ASO LIN E
1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - System & Component Testing - Trucks & RWD Vans - Gas
Dodge: Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon
Jeep Cherokee, Grand Cherokee, Wrangler
INTRODUCTION
Before testing individual components or systems, perform
procedures in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS -
GASOLINE article. Since many computer controlled and monitored
components set a fault message if they malfunction, also perform
procedures in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
NOTE: Testing of individual components does not isolate possible
shorts or opens in wiring harness of electronically
controlled systems. Perform all voltage tests using a Digital
Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance\
unless otherwise instructed in procedure. Use an ohmmeter to
isolate wiring harness shorts or opens.
COMPUTERIZED ENGINE CONTROLS
POWERTRAIN CONTROL MODULE (PCM)
PCM power and ground circuits may be checked by performing
TEST NS-1 in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article. For
PCM location, see PCM LOCATION table.
PCM LOCATION
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Application Location
Dakota & Durango ................. Right Front Fender, Near Firewall
Ram Pickup, Ram Van & Ram Wagon ...... On Firewall, Near Wiper Motor
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ENGINE SENSORS, SOLENOIDS & SWITCHES
SENSORS
Camshaft Position (CMP) Sensor
See appropriate DTC P0340: NO CAM SIGNAL AT PCM test in SELF-
DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
Crankshaft Position (CKP) Sensor
See appropriate DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM
test in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
Engine Coolant Temperature (ECT) Sensor
See appropriate DTC P0117: ECT SENSOR VOLTAGE TOO LOW and DTC
P0118: ECT SENSOR VOLTAGE TOO HIGH tests in SELF-DIAGNOSTICS - JEEP,
TRUCKS & RWD VANS article.
Heated Oxygen Sensor (HO2S)
See appropriate DTC for oxygen sensor in SELF-DIAGNOSTICS -
JEEP, TRUCKS & RWD VANS article.
Page 1453 of 1691
* Air in fuel system:
* Coolant leak into combustion chamber:
* Block heater malfunction in cold weather:
* Clogged or defective fuel filter:
* Poor fuel quality:
* Fuel injector malfunctioning or loose:
* Restricted or blocked fuel injection or supply lines:
* Intake/exhaust valves not adjusted properly (tight):
* Intake heaters malfunctioning:
* Internal engine damage.
BLUE EXHAUST SMOKE
* Air filter dirty or plugged:
* Air intake system restricted:
* Air leak in intake between turbocharger and intake
manifold:
* Restricted exhaust:
* Restricted turbocharger drain tube:
* Crankcase ventilation plugged:
* Valve stems, guides or seals worn or defective:
* Piston rings improperly gapped, worn or broken:
* Internal engine wear:
* Turbocharger failure.
INTERMITTENTS
INTERMITTENT PROBLEM DIAGNOSIS
Intermittent fault testing requires duplicating circuit or
component failure to identify problem. These procedures may lead to
PCM setting a Diagnostic Trouble Code (FTC) which may help in
diagnosis.
If problem vehicle does not produce DTCs, monitor voltage or
resistance values using a Digital Volt-Ohmmeter (DVOM) while
attempting to reproduce conditions causing intermittent fault. A
status change on DVOM indicates a fault has been located.
Use a DVOM to pinpoint faults. When monitoring voltage,
ensure ignition switch is in ON position or engine is running. Ensure
ignition switch is in OFF position or negative battery cable is
disconnected when monitoring circuit resistance. Status changes on
DVOM during test procedures indicate area of fault.
TEST PROCEDURES
Intermittent Simulation
To reproduce conditions creating an intermittent fault, use
following methods:
* Lightly vibrate component
* Heat component
* Wiggle or bend wiring harness
* Spray component with water
* Remove/apply vacuum source
Monitor circuit/component voltage or resistance while
simulating intermittent. If engine is running, monitor for diagnostic
trouble codes. Use test results to identify a faulty component or
circuit.
Page 1455 of 1691
Check the following:
* Check secondary ignition system
* Check engine vacuum
* Check fuel pressure
* Check Engine Coolant Temperature (ECT) sensor calibration
* Check Throttle Position (TP) sensor calibration
* Check Manifold Absolute Pressure (MAP) calibration
* Check minimum idle airflow
* Check Idle Air Control (IAC) motor operation
* Check engine mechanical condition
* Check evaporative system
* Check EGR system
* Check coolant temperature sensor and connector
* Check Intake Air Temperature (IAT) sensor calibration
STARTS BUT STALLS
Check the following:
* Check secondary ignition system
* Check PCM power and ground circuits
* Check fuel pressure
* Check Engine Coolant Temperature (ECT) sensor calibration
* Check Throttle Position (TP) sensor calibration
* Check Manifold Absolute Pressure (MAP) calibration
* Check minimum idle airflow
* Check Idle Air Control (IAC) motor operation
HESITATION OR STUMBLE
Check the following:
* Check secondary ignition system
* Check PCM power and ground circuits
* Check engine vacuum
* Check fuel pressure
* Check Engine Coolant Temperature (ECT) sensor calibration
* Check Throttle Position (TP) sensor calibration
* Check Manifold Absolute Pressure (MAP) calibration
* Check minimum idle airflow
* Check oxygen sensor switching
* Check oxygen sensor heater
* Check Idle Air Control (IAC) motor operation
* Check engine mechanical condition
* Check evaporative system
* Check EGR system
* Check Intake Air Temperature (IAT) sensor calibration
* Check Park/Neutral Position (PNP) switch.
SURGING
Check the following:
* Check secondary ignition system
* Check PCM power and ground circuits
* Check engine vacuum
* Check fuel pressure
* Check Engine Coolant Temperature (ECT) sensor calibration
* Check Throttle Position (TP) sensor calibration
* Check Manifold Absolute Pressure (MAP) calibration
* Check minimum idle airflow