1999 DODGE RAM oil temperature

brakelines are attached to and is mounted in the engine compartment.
ECM OUTPUT SIGNALS
APPS & CKP Output To PCM
See ACCELERATOR PEDAL POSITION SENSOR (APPS) OUTPUT FROM ECM
under PCM INPUT SIGNALS.
CCD Bus
These circuits are connected between Engine Control Module
(ECM) and Powertrain Control Module (PCM) to allow communication
between modules.
DLC Output
Data Link Connector (DLC) is connected to Engine Control
Module (ECM). Using a scan tool, data can be retrieved (output) from\
ECM.
5-Volt Sensor Supply Output
Engine Control Module (ECM) supplies a 5-volt reference
signal to the following sensors:
* Crankshaft Position (CKP) Sensor
* Camshaft Position (CMP) Sensor
* Intake Air Temperature (IAT) Sensor
* Engine Oil Pressure Sensor
* Manifold Absolute Pressure (MAP) Sensor
Engine Control Module (ECM) also supplies voltage to the
following sensors:
* Accelerator Pedal Position Sensor (APPS)
* Intake Air Temperature (IAT) Sensor
* Engine Oil Pressure Sensor
* Engine Coolant Temperature (ECT) Sensor
* Manifold Absolute Pressure (MAP) Sensor
* Water-In-Fuel (WIF) Sensor
Fuel Injection Pump Relay
The Engine Control Module (ECM) energizes the fuel injection
pump and integral Fuel Pump Control Module (FPCM) through the relay.
When ignition is turned on, ECM supplies 12 volts to fuel injection
pump relay, located in Power Distribution Center.
Fuel Pump Control Module (FPCM)
Fuel Pump Control Module (FPCM) controls fuel pump using
inputs from Engine Control Module (ECM). FPCM is integral to top of
fuel pump. ECM and FPCM are interconnected together for fuel injection
control.
Fuel Transfer Pump
Engine Control Module (ECM) supplies power to fuel transfer
pump. Transfer fuel pump supplies fuel under low pressure (14 psi)
while engine is running to fuel injection pump. Fuel transfer pump
supplies an excess of fuel to cool fuel injection pump. Excess fuel is
returned to fuel tank by fuel injection pump.
Intake Manifold Air Heater Relays
Intake manifold air heater relays provide voltage to intake
manifold air heater for warming of intake. See Fig. 5. Warming of
intake air aids in engine starting and improved driveability during
cold ambient temperatures. Intake manifold air heater relays are
mounted on inner wheelwell, below driver's side battery. See Fig. 6.


E - T H EO RY/O PER ATIO N - R W D - G ASO LIN E

1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - Theory & Operation - Trucks & RWD Vans - Gasoline
Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon
INTRODUCTION
This article covers the basic description and operation of
engine performance related systems and components. Read this article
before working on unfamiliar systems.
COMPUTERIZED ENGINE CONTROLS
POWERTRAIN CONTROL MODULE (PCM)
The PCM is a digital computer that controls ignition timing,
air/fuel ratio, fuel injector pulse width, ignition coil(s), spark
advance, emission control devices, cooling fan, charging system, idle
speed, cruise control (if equipped), fuel pump and tachometer. For PCM\
location, see PCM LOCATION. PCM uses data from various input sources
to control output devices in order to achieve optimum engine
performance for all operating conditions.
PCM has voltage converters that convert battery voltage to
regulated 5-volt output. The 5-volt output powers battery temperature
sensor, Camshaft Position (CMP) sensor on models equipped with
Distributorless Ignition System (DIS) or distributor on models without\
DIS, Crankshaft Position (CKP) sensor, Engine Coolant Temperature
(ECT) sensor, Intake Air Temperature (IAT) sensor, logic circuits,
Manifold Absolute Pressure (MAP) sensor, Throttle Position (TP) sens\
or
and Vehicle Speed Sensor (VSS) on some models.
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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NOTE: Components are grouped into 2 categories. The first category,
INPUT DEVICES, includes components that control or produce
voltage signals monitored by the PCM. The second category,
OUTPUT SIGNALS, includes components controlled by the PCM
(this is accomplished by the PCM grounding individual
circuits).
INPUT DEVICES
Vehicles are equipped with different combinations of input
devices. Not all devices are used on all models. To determine
component location and input usage on a specific model, see
appropriate wiring diagram in WIRING DIAGRAMS article. Available input
signals include:
A/C Switch
Switch signals PCM that A/C has been selected. PCM then
activates A/C compressor clutch relay and maintains idle speed at a
preprogrammed RPM. This is done through control of Idle Air Control

(IAC) motor.
Battery Temperature Sensor
PCM uses sensor to determine battery temperature and to
control battery charging rate. Temperature data along with battery
voltage data, is used by PCM to vary charging rate. System voltage is
higher at colder temperatures and is gradually reduced at warmer
temperatures.
Battery Voltage
PCM monitors battery voltage to determine fuel injector pulse
width and generator field control. This is done to compensate for
reduced current flow through injector caused by lowered voltage.
Brake Switch
This switch may also be referred to as a brakelight switch.
PCM uses this switch input to maintain idle speed at a preprogrammed
RPM when brakes are applied. If PCM receives an input signal from
brake switch when speed control system is on, PCM will turn speed
control system off.
Camshaft Position (CMP) Sensor
On models equipped with a distributor, CMP sensor is made up
of a Hall Effect switch (sync signal generator) and a rotating pulse
ring (shutter) on distributor shaft. See Fig. 1. On Distributorless
Ignition System (DIS), CMP sensor reads slots in cam timing sprocket.
PCM uses this information along with information from Crankshaft
Position (CKP) sensor to determine if fuel injectors and ignition
coils are properly sequenced for correct cylinders.
Fig. 1: Cut-Away View Of Hall Effect Distributor (Typical)
Courtesy of Chrysler Corp.
Crankshaft Position (CKP) Sensor
CKP sensor detects sets of slots on flywheel/torque converter

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.

Transmission
Manufacturer recommends using Mopar ATF Plus Type 7176.
Manufacturer does not recommend using additives with transmission
fluid.
Transfer Case
Manufacturer recommends using Mopar ATF Plus Type 7176.
Power Take-Off (PTO) Adapter (Ram Pickup 2WD 2500 & 3500)
Manufacturer recommends using Mopar ATF Plus Type 7176.
FLUID CAPACITIES
TRANSMISSION REFILL CAPACITIES ( 1)








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Application Refill Dry Fill
Qts. (L) Qts. (L\
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Dakota & Durango
42RE, 44RE & 46RE ... ( 2) 1.5 (1.4) .... ( 3) 9.5-11.4 (9.0-10.8)
Ram Pickup
42RE ................ ( 2) 1.5 (1.4) .... ( 3) 8.5-11.0 (8.0-10.4)
46RE ................ ( 2) 1.5 (1.4) .... ( 3) 8.7-13.0 (8.2-12.3)
47RE ................ ( 2) 1.5 (1.4) .... ( 3) 8.7-16.9 (8.2-16.0)
Ram Van/Wagon
32RH & 36RH ......... ( 2) 1.5 (1.4) ...... ( 3) 8.5-9.0 (8.0-8.5)
46RE ................ ( 2) 1.5 (1.4) .. ( 3) 11.4-11.6 (10.8-11.0)
( 1) - Approximate quantity listed.
( 2) - Add fluid until fluid level is at MIN arrow mark on dipstick.
Start engine and allow engine to idle. With brakes applied,
shift transmission through all gears and back to Neutral. Add
additional fluid to bring fluid level to MIN mark on dipstick.
Recheck fluid level with transmission at normal operating
temperature. Adjust fluid level to MAX arrow mark on dipstick.
( 3) - Quantity may vary by type of oil cooler and oil cooler lines.









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TRANSFER CASE REFILL CAPACITIES ( 1)








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Application Pts. (L)\
Dakota & Durango
NV231 .................................................... 2.5 (1.2)\
NV242 .................................................... 2.8 (1.4)\
Ram Pickup
1500 ..................................................... 2.5 (1.2)\
2500 & 3500
2WD With Power Take-Off (PTO) Adapter ................. 9.0 (4.3\
)
5.9L Diesel & V10 ..................................... 6.5 (3.1)\
All Others ............................................ 5.0 (2.4)\
(1) - Approximate quantity listed.









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POWER TAKE-OFF (PTO) ADAPTER REFILL CAPACITIES ( 1)








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Application Pts. (L)\
Ram Pickup
2WD 2500 & 3500 ........................................ 4.6 (2.2)\

(1) - Approximate quantity listed.








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DRAINING & FILLING
Transmission
1) Raise and support vehicle. Loosen oil pan bolts, allowing
fluid to drain from oil pan. Remove oil pan bolts, oil pan and gasket.
Remove oil filter bolts and oil filter from valve body.
2) Adjust kickdown band and low-reverse bands if necessary.
See KICKDOWN BAND and LOW-REVERSE BAND under ADJUSTMENTS.
3) Clean oil pan, magnet and all sealing surfaces. Install
NEW oil filter. Install and tighten oil filter bolts to specification.
See TORQUE SPECIFICATIONS.
4) Using NEW gasket, install oil pan. Install and tighten oil
pan bolts to specification. See TORQUE SPECIFICATIONS.
5) Add Mopar ATF Plus Type 7176 fluid until fluid level is at
MIN arrow mark on dipstick. Start engine and allow engine to idle.
With brakes applied, shift transmission through all gears and back to
Neutral.
6) Add additional fluid to bring fluid level to MIN mark on
dipstick. Recheck fluid level with transmission at normal operating
temperature. Adjust fluid level to MAX arrow mark on dipstick. DO NOT
overfill transmission.
Transfer Case
1) Ensure vehicle is parked on level surface. Remove transfer
case drain plug. Transfer case drain plug is located on rear of
transfer case at driver's side corner of transfer case. Allow fluid to
drain from transfer case.
2) Reinstall transfer case drain plug. Tighten transfer case
drain plug to specification. See TORQUE SPECIFICATIONS. Remove
transfer case fill plug from rear of transfer case. Transfer case fill
plug is located on rear of transfer case, just below identification
tag.
3) Fill transfer case with appropriate type of transfer case
fluid until fluid level is even with bottom of fill plug hole on
transfer case. See RECOMMENDED FLUID. Install and tighten transfer
case fill plug to specification. See TORQUE SPECIFICATIONS.
Power Take-Off (PTO) Adapter (Ram Pickup 2WD 2500 & 3500)
1) Ensure vehicle is parked on level surface. Remove drain
plug from rear of PTO adapter. See Fig. 3. Allow fluid to drain from
PTO adapter.
2) Reinstall drain plug. Tighten drain plug to specification.
See TORQUE SPECIFICATIONS. Remove fill plug from rear of PTO adapter.
See Fig. 3 .
3) Fill PTO adapter with appropriate type of fluid until
fluid level is even with bottom of fill plug hole on PTO adapter. See
RECOMMENDED FLUID. Install and tighten fill plug to specification. See
TORQUE SPECIFICATIONS.
ADJUSTMENTS
KICKDOWN BAND
1) Kickdown band is front band on transmission. Raise and
support vehicle. Loosen kickdown band adjusting screw lock nut while
preventing kickdown adjusting screw from rotating. Kickdown band
adjusting screw is located on side of transmission, near manual lever
shaft. See Fig. 4.
2) Back off kickdown band adjusting screw lock nut 5 turns.

1) Low-reverse band is rear band on transmission. Oil pan
must be removed from transmission to adjust low-reverse band. Raise
and support vehicle. Loosen oil pan bolts. Allow fluid to drain from
oil pan. Remove oil pan bolts, oil pan and gasket.
2) Loosen low-reverse band adjusting screw lock nut while
preventing low-reverse band adjusting screw from rotating. Low-reverse
band adjusting screw lock nut and low-reverse band adjusting screw are
located inside transmission, near low-reverse band. See Fig. 5.
3) Back off low-reverse band adjusting screw lock nut 5
turns. Ensure low-reverse band adjusting screw rotates freely in
transmission case.
4) Tighten low-reverse band adjusting screw to 72 INCH lbs.
(8.1 N.m). Back off low-reverse band adjusting screw specified amount
of turns. See LOW-REVERSE BAND ADJUSTMENT table. Hold low-reverse band
adjusting screw and tighten low-reverse band adjusting screw lock nut
to specification. See TORQUE SPECIFICATIONS.
LOW-REVERSE BAND ADJUSTMENT









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Application Back Off Adjusting Screw
32RH ....................................................... 4 Turns
36H ........................................................ 2 Turns
42RE ....................................................... 4 Turns
44RE ....................................................... 4 Turns
46RE ....................................................... 2 Turns
47RE ....................................................... 3 Turns









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5) Clean oil pan, magnet and all sealing surfaces. Using NEW
gasket, install oil pan. Install and tighten oil pan bolts to
specification. See TORQUE SPECIFICATIONS.
6) Add Mopar ATF Plus Type 7176 fluid until fluid level is at
MIN arrow mark on dipstick. Start engine and allow engine to idle.
With brakes applied, shift transmission through all gears and back to
Neutral.
7) Add additional fluid to bring fluid level to MIN mark on
dipstick. Recheck fluid level with transmission at normal operating
temperature. Adjust fluid level to MAX arrow mark on dipstick. DO NOT
overfill transmission.
Fig. 5: Locating Low-Reverse Band Adjusting Screw & Low-Reverse
Band Adjusting Screw Lock Nut
Courtesy of Chrysler Corp.
SHIFT CABLE