Dodge Dakota (R1). Manual — part 565
(8) Verify Crankcase Ventilation (CCV) system
operation. Verify CCV system hoses and fixed orifice
fitting are firmly connected (Fig. 16). Refer to 25,
Emission Control System for additional information.
(9) Inspect fuel tube quick-connect fitting-to-fuel
rail connections.
(10) Verify hose connections to all ports of vacuum
fittings on intake manifold are tight and not leaking.
(11) Inspect accelerator cable and throttle cable.
Check their connections to throttle arm of throttle
body for any binding or restrictions.
(12) If equipped with vacuum brake booster, verify
vacuum booster hose is firmly connected to fitting on
intake manifold. Also check connection to brake vac-
uum booster.
(13) Inspect air cleaner inlet and air cleaner ele-
ment for dirt or restrictions.
(14) Inspect radiator grille area, radiator fins and
air conditioning condenser for restrictions.
(15) Verify intake manifold air temperature sensor
wire connector is firmly connected to harness connec-
tor (Fig. 17).
(16) Verify MAP sensor electrical connector is
firmly connected to MAP sensor (Fig. 18). Also verify
rubber L-shaped fitting from MAP sensor to throttle
body is firmly connected.
(17) Verify fuel injector wire harness connectors
are firmly connected to injectors in the correct order.
Each harness connector is numerically tagged with
injector number (INJ 1, INJ 2 etc.) of its correspond-
ing fuel injector and cylinder number.
(18) Verify harness connectors are firmly con-
nected to idle air control (IAC) motor, throttle posi-
Fig. 16 CCV System—2.5L Engine
1 - FIXED ORIFICE FITTING
2 - AIR INLET FITTING
3 - CCV TUBE
4 - CCV TUBE
Fig. 17 Intake Manifold Air Temperature Sensor—
2.5L Engine
1 - FUEL PRESSURE TEST PORT
2 - ELECTRICAL CONNECTOR
3 - INTAKE MANIFOLD AIR TEMPERATURE SENSOR
4 - FUEL INJECTOR
Fig. 18 Sensor Location—2.5L Engine
1 - IDLE AIR CONTROL MOTOR
2 - IAT SENSOR
3 - THROTTLE BODY
4 - THROTTLE POSITION SENSOR
5 - MAP SENSOR
6 - IDLE AIR CONTROL PASSAGE INLET
7 - THROTTLE BODY MOUNTING BOLTS (4)
14 - 32
FUEL INJECTION
AN
FUEL INJECTION (Continued)
tion sensor (TPS) and manifold absolute pressure
(MAP) sensor (Fig. 18).
(19) Verify wire harness connector is firmly con-
nected to engine coolant temperature sensor (Fig.
19).
(20) Raise and support the vehicle.
(21) Verify both upstream and downstream oxygen
sensor wire connectors are firmly connected to sen-
sors. Inspect sensors and connectors for damage (Fig.
20) or (Fig. 21).
(22) Inspect for pinched or leaking fuel tubes.
Inspect for pinched, cracked or leaking fuel hoses.
(23) Inspect for exhaust system restrictions such
as pinched exhaust pipes, collapsed muffler or
plugged catalytic convertor.
(24) Verify electrical harness is firmly connected to
rear wheel speed sensor. Verify rear wheel speed sen-
sor is firmly attached to rear axle with proper air
gap. Refer to 5, Brakes for information.
(25) If equipped with 4–wheel antilock brake sys-
tem, verify electrical harness is firmly connected to
each front wheel speed sensor. Verify both front
wheel speed sensors are firmly attached. Refer to 5,
Brakes for information.
(26) Verify fuel pump/gauge sender unit wire con-
nector is firmly connected to harness connector.
(27) Inspect fuel hoses at fuel pump/gauge sender
unit for cracks or leaks.
(28) Inspect clutch housing for damage to timing
ring on drive plate/flywheel.
(29) Verify battery cable and solenoid feed wire
connections to the starter solenoid are tight and
clean. Inspect for chaffed wires or wires rubbing
against other components.
Fig. 19 Engine Coolant Temperature Sensor—2.5L
Engine
1 - THERMOSTAT HOUSING
2 - ENGINE COOLANT TEMPERATURE SENSOR
3 - ELECTRICAL CONNECTOR
Fig. 20 Upstream Oxygen Sensor—2.5L Engine
1 - UPSTREAM OXYGEN SENSOR
2 - EXHAUST PIPE
Fig. 21 Downstream Oxygen
1 - DOWNSTREAM OXYGEN SENSOR
2 - FRAME RAIL
3 - CATALYTIC CONVERTER
AN
FUEL INJECTION
14 - 33
FUEL INJECTION (Continued)
SPECIFICATIONS
SPECIFICATIONS - TORQUE
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
Engine Coolant Temperature Sensor—All Engines
11
96
IAC Motor-To-Throttle Body Bolts
7
60
Intake Manifold Air Temp. Sensor—All Engines
28
20
MAP Sensor Mounting Screws—All Engines
3
25
Oxygen Sensor—All Engines
30
22
Power Steering Pressure Switch
14-22
124-195
Powertrain Control Module Mounting Screws
3-5
30-40
Throttle Body Mounting Bolts—2.5L Engine
11
100
Throttle Body Mounting Bolts—3.9L/5.2L Engines
23
200
Throttle Position Sensor Mounting Screws—All
Engines
7
60
ACCELERATOR PEDAL
REMOVAL
All engines are equipped with torsion return
springs located on the throttle body shaft. 3.9L V-6
and 5.2/5.9L V-8 engines equipped with a manual
transmission have an additional pedal return spring
on the throttle body linkage.
CAUTION: Be careful not to damage or kink the
cable core wire (within the cable sheathing) while
servicing accelerator pedal or cables.
(1) From inside the vehicle, hold up accelerator
pedal. Remove plastic cable retainer and throttle
cable core wire from upper end of pedal arm (Fig.
22). Plastic cable retainer snaps into pedal arm.
(2) Remove two accelerator pedal/bracket nuts
(Fig. 22)and remove pedal/bracket assembly from
vehicle.
INSTALLATION
All engines are equipped with torsion return
springs located on the throttle body shaft. 3.9L V-6
and 5.2/5.9L V-8 engines equipped with a manual
transmission have an additional pedal return spring
on the throttle body linkage.
(1) Position pedal/bracket assembly over the two
dash panel mounting studs and install retaining
nuts.
(2) Tighten nuts to 7 N·m (65 in. lbs.) torque.
(3) From inside the vehicle, hold up the accelerator
pedal. Install the throttle cable core wire and plastic
cable retainer into the upper end of the pedal arm.
The plastic retainer is snapped into the pedal arm.
Fig. 22 Accelerator Pedal—Removal or Installation
1 - PINCH SIDES
2 - CABLE
3 - CABLE RETAINER
4 - NUTS (2)
5 - ACCELERATOR PEDAL
14 - 34
FUEL INJECTION
AN
FUEL INJECTION (Continued)
When installing the plastic retainer to the accelera-
tor pedal arm, note the index tab on the pedal arm
(Fig. 23). Align the index slot (Fig. 23) on the plastic
cable retainer to this index tab.
CRANKSHAFT POSITION
SENSOR
DESCRIPTION - 2.5L
The Crankshaft Position (CKP) sensor is located
near the outer edge of the flywheel (or starter
ringear).
DESCRIPTION - 3.9L
The Crankshaft Position (CKP) sensor is located
near the outer edge of the flywheel (starter ringear).
DESCRIPTION - 5.2L/5.9L
The Crankshaft Position (CKP) sensor is located
near the outer edge of the flywheel (starter ringear).
DESCRIPTION - 4.7L
The Crankshaft Position Sensor (CKP) is mounted
into the right-rear side of the engine block (Fig. 24).
OPERATION - 2.5L
Engine speed and crankshaft position are provided
through the CKP sensor. The sensor generates pulses
that are the input sent to the Powertrain Control
Module (PCM). The PCM interprets the sensor input
to determine the crankshaft position. The PCM then
uses this position, along with other inputs, to deter-
mine injector sequence and ignition timing.
The sensor is a hall effect device combined with an
internal magnet. It is also sensitive to steel within a
certain distance from it.
The flywheel/drive plate has groups of four notches
at its outer edge. On 2.5L 4-cylinder engines there
are two sets of notches (Fig. 25).
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM. For each engine revolution there are two
groups of four pulses generated on 2.5L 4-cylinder
engines.
The trailing edge of the fourth notch, which causes
the pulse, is four degrees before top dead center
(TDC) of the corresponding piston.
The engine will not operate if the PCM does not
receive a CKP sensor input.
OPERATION - 3.9L
Engine speed and crankshaft position are provided
through the CKP sensor. The sensor generates pulses
that are the input sent to the Powertrain Control
Module (PCM). The PCM interprets the sensor input
to determine the crankshaft position. The PCM then
uses this position, along with other inputs, to deter-
mine injector sequence and ignition timing.
The sensor is a hall effect device combined with an
internal magnet. It is also sensitive to steel within a
certain distance from it.
The flywheel/drive plate has groups of notches at
its outer edge. On 3.9L V-6 engines, there are three
Fig. 23 Index Tab and Slot
1 - INDEX TAB
2 - INDEX SLOT
3 - CABLE RETAINER
4 - PEDAL ARM
Fig. 24 CKP Sensor Location—4.7L V–8 Engine
1 - CRANKSHAFT POSITION SENSOR
2 - MOUNTING BOLT
AN
FUEL INJECTION
14 - 35
ACCELERATOR PEDAL (Continued)
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