oxygen sensor DODGE RAM 1999 Service User Guide

Removal
Downstream oxygen sensor is mounted on exhaust pipe, behind
catalytic converter. Raise and support vehicle. Disconnect electrical
connector for downstream oxygen sensor. Using Socket (YA8875), remove
downstream oxygen sensor from exhaust pipe.
Installation
If installing original or used downstream oxygen sensor,
apply anti-seize compound on threads of downstream oxygen sensor. A
NEW downstream oxygen sensor should already be coated with anti-seize
compound. Install and tighten downstream oxygen sensor to
specification. See TORQUE SPECIFICATIONS. Install electrical
connector.
ENGINE COOLANT TEMPERATURE SENSOR
Removal & Installation (Dakota 2.5L)
1) Partially drain cooling system. Disconnect electrical
connector at engine coolant temperature sensor. Engine coolant
temperature sensor is located on side of thermostat housing and
contains a Tan/Black wire and a Black/Light Blue wire in the
electrical connector.
2) Remove engine coolant temperature sensor. To install,
reverse removal procedure. Tighten engine coolant temperature sensor
to specification. See TORQUE SPECIFICATIONS. Fill cooling system.
Removal (Dakota 3.9L, 5.2L & 5.9L, Durango & Ram Pickup 3.9L,
5.2L & 5.9L)
1) Partially drain cooling system. Engine coolant temperature
sensor is located on front of intake manifold, near inside of
generator and contains a Tan/Black wire and a Black/Light Blue wire in
the electrical connector.
2) Remove air cleaner if necessary for access to engine
coolant temperature sensor. On models equipped with A/C, go to next
step. On models not equipped with A/C, disconnect electrical connector
at engine coolant temperature sensor. Remove engine coolant
temperature sensor.
3) On A/C equipped models, electrical connector on engine
coolant temperature sensor may be difficult to reach. It may be
necessary to use a coat hanger and fabricate an "L" shaped tool about
8" (203 mm) long to disconnect electrical connector by placing hook
part of tool under electrical connector and pulling electrical
connector upward from engine coolant temperature sensor. Remove engine
coolant temperature sensor.
Installation
To install, reverse removal procedure. Tighten engine coolant
temperature sensor to specification. See TORQUE SPECIFICATIONS. Fill
cooling system.
Removal & Installation (Ram Pickup 8.0L)
1) Partially drain cooling system. Engine coolant temperature
sensor is located on front of intake manifold, near rear of generator
and contains a Tan/Black wire and a Black/Light Blue wire in the
electrical connector.
2) Disconnect electrical connector at engine coolant
temperature sensor. Remove engine coolant temperature sensor.
3) To install, reverse removal procedure. Tighten engine
coolant temperature sensor to specification. See TORQUE
SPECIFICATIONS. Fill cooling system.
Removal (Ram Van & Ram Wagon)

TRANSMISSION TEMPERATURE SENSOR
Removal & Installation (A/T Models)
Transmission temperature sensor is located on transmission
valve body, incorporated into governor pressure sensor. See
appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS
section.
UPSTREAM OXYGEN SENSOR
NOTE: Upstream oxygen sensor may also be referred to as pre
-catalyst oxygen sensor.
Removal
Upstream oxygen sensor is mounted on exhaust pipe, in front
of catalytic converter. Raise and support vehicle. Disconnect
electrical connector for upstream oxygen sensor. Using Socket
(YA8875), remove upstream oxygen sensor from exhaust pipe.
Installation
1) If installing original or used upstream oxygen sensor,
apply anti-seize compound on threads of upstream oxygen sensor. A NEW
upstream oxygen sensor should already be coated with anti-seize
compound.
2) Install and tighten upstream oxygen sensor to
specification. See TORQUE SPECIFICATIONS. Install electrical
connector.
MOTORS, RELAYS & SOLENOIDS
IDLE AIR CONTROL (IAC) MOTOR
Removal & Installation (Dakota, Durango, Ram Pickup 3.9L,
5.2L & 5.9L, Ram Van & Ram Wagon)
1) IAC motor is located on throttle body and contains a 4-pin
electrical connector. On Ram Van and Ram Wagon, remove engine cover.
2) On all models, remove air inlet duct or air cleaner
assembly for access to IAC motor. Disconnect electrical connector at
IAC motor. Remove retaining bolts and IAC motor from throttle body.
3) To install, reverse removal procedure. Tighten IAC motor
retaining bolts to specification. See TORQUE SPECIFICATIONS.
Removal & Installation (Ram Pickup 8.0L)
1) IAC motor is located at rear of throttle body and contains
a 4-pin electrical connector. Remove air inlet duct at air cleaner
assembly. Remove cover from air cleaner assembly.
2) Remove air cleaner housing-to-throttle body nuts and air
cleaner housing from throttle body. Disconnect electrical connector at
IAC motor. Remove retaining bolts and IAC motor.
3) To install, reverse removal procedure. Tighten IAC motor
retaining bolts and air cleaner housing-to-throttle body nuts to
specification. See TORQUE SPECIFICATIONS.
A/C RELAY, AUTO SHUTDOWN (ASD) RELAY & FUEL PUMP RELAY
NOTE: A/C relay may also be referred to as A/C clutch relay or A/C
compressor clutch relay.
Removal & Installation
Relays are located in Power Distribution Center (PDC). Relays\
may be identified by label on inside of PDC cover. See POWER
DISTRIBUTION CENTER (PDC) LOCATION table.

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Application Ft. Lbs. (N.m)\
Crankshaft Position Sensor Bolt
2.5L ..................................................... 14 (19)\
3.9L, 5.2L & 5.9L ............................................ (1)
8.0L ......................................................... ( 1)
Downstream Oxygen Sensor ................................... 22 (30)\
Distributor Hold-Down Bolt ................................. 17 (23)\
EVAP Canister-To-Mounting Bracket Nut
Dakota & Durango ......................................... 17 (23)\
Ram Pickup ................................................... ( 2)
Ram Van & Ram Wagon .......................................... ( 3)
Fuel Pump Module Lock Nut
Dakota ................................................... 40 (54)\
Ram Pickup ............................................... 32 (43)\
Ram Van & Ram Wagon ...................................... 40 (54)\
Fuel Rail Bolt
2.5L ......................................................... ( 4)
3.9L, 5.2L & 5.9L ........................................ 17 (23)\
8.0L ..................................................... 11 (15)\
Fuel Tank Strap Nut
Dakota & Durango ......................................... 40 (54)\
Ram Pickup ............................................... 30 (41)\
Ram Van & Ram Wagon .......................................... ( 5)
IAT Sensor ................................................. 20 (27)\
Park/Neutral Switch ........................................ 25 (34)\
Power Steering Pressure Switch (2.5L) ...................... 16 (22\
)
Spark Plug ................................................. 30 (41)\
Throttle Body Bolt
2.5L ......................................................... ( 4)
3.9L, 5.2L & 5.9L ........................................ 17 (23)\
Throttle Body Nut (8.0L) ................................... 16 (22\
)
Upper Intake Manifold Bolt (8.0L) ...................... ( 6) 16 (22)
Upstream Oxygen Sensor ..................................... 22 (30)\
Wheel Lug Nut (Dakota & Durango) ......................... 100 (136\
)
INCH Lbs. (N.m)
Air Cleaner Housing-To-Throttle
Body Nut (Dakota & Durango) ............................. 96 (10.8\
)
Camshaft Position Sensor Bolt (8.0L) ...................... 50 (5.6\
)
Engine Coolant Temperature Sensor ........................ 96 (10.8)\
EVAP Canister Mounting Bracket-To
Body Nut (Ram Van & Ram Wagon) .......................... 95 (10.7\
)
EVAP Leak Detection Pump Filter
Bolt (Ram Pickup, Ram Van & Ram Wagon) ................... 65 (7.3\
)
EVAP Leak Detection Pump Bolt ............................. 11 (1.2)\
EVAP Purge Solenoid Nut (Dakota & Durango) ................ 75 (8.5\
)
IAC Motor Bolt ............................................ 60 (6.8)\
Ignition Coil Bolt/Nut
Dakota, Durango, Ram Van & Ram Wagon ......................... ( 7)
Ram Pickup
3.9L, 5.2L & 5.9L ........................................... ( 7)
8.0L .................................................. 90 (10.2)\
MAP Sensor Bolt
Dakota & Durango ........................................ 25 (2.8)\
Ram Pickup
3.9L, 5.2L & 5.9L ...................................... 25 (2.8)\
8.0L ................................................... 20 (2.3)\
Ram Van & Ram Wagon ..................................... 25 (2.8)\
PCM Bolt .................................................. 35 (4.0)\
TP Sensor Bolt ............................................ 60 (6.8)\

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(
1) - SAE 10W-30 engine oil is preferred. Use only API approved 

oil with Starburst Symbol. 

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FLUID CAPACITIES 

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Item  Condition  Specification (1) 

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Engine Oil  5.9L: Drained, W/New Filter  5 Qts. (4.7L) 


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 8.0L: Drained, W/New Filter  5 Qts. (4.7L) 


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 5.9L: Drained  4.5 Qts. (4.2L) 

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Engine  5.9L: Drained  20 Qts. (19L) 

Coolant 
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 8.0L: Drained  24 Qts. (22.7L) 

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(
1) - Capacities are recommended or calculated levels. Always use 

dipstick (if available) to measure level. 
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82,500 MILE (132,000 KM)/82 MONTH NORMAL SERVICE
82,500 MILE (132,000 KM)/82 MONTH NORMAL SERVICE
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VERIFY 

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Last Major Service Was Performed. 

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REPLACE 

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 Oxygen Sensor (5.9L Only) (
1) 

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(
1)  Requires service reminder indicator light. If so equipped, 

these parts are to be replaced at the indicated mileage 

when the service reminder indicator light remains on 

continuosly with the key in the "ON" position, which occurs 

first. 
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84,000 MILE (134,000 KM) SEVERE DUTY SERVICE
84,000 MILE (134,000 KM) SEVERE DUTY SERVICE
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VERIFY 

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Last Major Service Was Performed. 

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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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 Engine Air Cleaner & Air Pump Filters 


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 Brake Linings 

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SERVICE 

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.


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.

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

* Check oxygen sensor switching
* Check Idle Air Control (IAC) motor operation
* Check evaporative system.
LACK OF POWER
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 oxygen sensor switching
* Check Idle Air Control (IAC) motor operation
* Check EGR system.
KNOCKING
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 oxygen sensor switching
* Check Idle Air Control (IAC) motor operation
* Check evaporative system.
ENGINE MISFIRE
Check the following:
* Check secondary ignition system
* Check PCM power and ground circuits
* Check fuel pressure
* Check minimum idle airflow
* Check oxygen sensor switching
* Check Idle Air Control (IAC) motor operation
* Check EGR system.
BACKFIRE
Check the following:
* Check secondary ignition system
* Check PCM power and ground circuits
* Check fuel pressure
* Check Manifold Absolute Pressure (MAP) calibration
* Check minimum idle airflow
* Check oxygen sensor switching
* Check EGR system.
ROUGH OR ERRATIC IDLE
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) motor operation
* Check Park/Neutral Position (PNP) switch.
POOR FUEL ECONOMY
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) motor operation
* Check Park/Neutral Position (PNP) switch.
INTERMITTENTS
INTERMITTENT PROBLEM DIAGNOSIS
Intermittent fault testing requires duplicating circuit or
component failure to identify the problem. These procedures may lead
to PCM setting a Diagnostic Trouble Code (FTC) which may help in
diagnosis.
If problem vehicle does not produce FTC, monitor voltage or
resistance values using a 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 the conditions creating an intermittent fault,
use the following methods:

drive plate. PCM uses this information to determine fuel injection
sequence, ignition signal and spark timing.
Cruise Control Switch
Cruise control switch provides PCM with 3 separate inputs.
ON/OFF switch input informs PCM that cruise control system has been
activated. SET/COAST switch input informs PCM that set vehicle speed
has been selected, or if depressed will decelerate until switch is
released. RESUME/ACCEL switch input informs PCM that a previously set
speed has been selected or, if depressed, will increase speed until
released. PCM uses these inputs to control cruise control servo.
Engine Coolant Temperature (ECT) Sensor
ECT sensor monitors engine coolant temperature. PCM uses ECT
sensor information to adjust air/fuel mixture and idle speed and to
control radiator cooling fans as necessary.
Fuel Level Sensor
PCM supplies a 5-volt reference signal to fuel module in gas
tank. Fuel level sensor sends a signal to PCM indicating fuel level.
PCM monitors this signal to prevent a false misfire signal if fuel
level is less than 15 percent. PCM also sends this signal to fuel
gauge.
Heated Oxygen Sensor (HO2S)
HO2S produces a small electrical voltage (0-1 volt) when
exposed to heated exhaust gas. HO2S is electrically heated for faster
warm-up. Heating element is powered through Auto Shutdown (ASD) relay.\
HO2S acts like a rich/lean (air/fuel ratio) switch by
monitoring oxygen content in exhaust gas. This information is used by
PCM to adjust air/fuel ratio by adjusting injector pulse width.
HO2S produces low voltage when oxygen content in exhaust gas
is high. When oxygen content in exhaust gas is low, HO2S produces a
higher voltage.
Ignition Switch
Ignition switch sends signal to PCM indicating whether switch
is on, off or cranking (ST). When PCM receives ON signal, it energizes\
ASD relay coil and supplies power to sensors and actuators. When PCM
receives ST signal, it controls fuel injection rate, idle speed,
ignition timing, etc. for optimum cranking conditions.
Intake Air Temperature (IAT) Sensor
IAT sensor measures temperature of incoming intake air. This
information is used by PCM to adjust air/fuel mixture.
Manifold Absolute Pressure (MAP) Sensor
MAP sensor monitors intake manifold vacuum. Sensor transmits
information on manifold vacuum and barometric pressure to PCM. MAP
sensor information is used with information from other sensors to
adjust air/fuel mixture.
Oil Pressure Sensor
Sensor sends a signal to PCM to indicate oil pressure.
Park/Neutral (P/N) Switch (A/T Models)
This switch may also be referred to as a Park/Neutral
Position (PNP) switch. P/N switch is available on vehicles equipped
with A/T only. Switch prevents engine starter from engaging if vehicle
is in any gear except Park or Neutral.
P/N switch input (varied with gear selection) is used to
determine idle speed, fuel injector pulse and ignition timing.