Dodge Neon / Neon SRT-4. Manual — part 288
(5) Insert fuel injector nozzles into openings in
intake manifold. Seat the injectors in place. Tighten
fuel rail mounting screws to 22.5 N·m ± 3 N·m
(200±30 in. lbs.).
(6) Attach electrical connectors to fuel injectors,
refer to the fuel injector connector section for electri-
cal connector installation.
(7) Connect fuel supply tube to fuel rail. Refer to
Quick Connect Fittings in the Fuel Delivery Section
of this Group.
FUEL PUMP RELAY
DESCRIPTION
The fuel pump relay is located in the PDC. The
inside top of the PDC cover has a label showing relay
and fuse location.
OPERATION
The fuel pump relay supplies battery voltage to the
fuel pump. A buss bar in the Power Distribution Cen-
ter (PDC) supplies voltage to the solenoid side and
contact side of the relay. The fuel pump relay power
circuit contains a fuse between the buss bar in the
PDC and the relay. The fuse is located in the PDC.
Refer to the Wiring Diagrams for circuit information.
The PCM controls the fuel pump relay by switch-
ing the ground path for the solenoid side of the relay
on and off. The PCM turns the ground path off when
the ignition switch is in the Off position. When the
ignition switch is in the On position, the PCM ener-
gizes the fuel pump. If the crankshaft position sensor
does not detect engine rotation, the PCM de-ener-
gizes the relay after approximately one second.
IDLE AIR CONTROL MOTOR
DESCRIPTION
The Idle Air Control (IAC) solenoid is mounted on
the throttle body. The PCM operates the idle air con-
trol solenoid (Fig. 27). It is an electric stepper sole-
noid.
OPERATION
The PCM adjusts engine idle speed through the
idle air control solenoid to compensate for engine
load, coolant temperature or barometric pressure
changes.
The throttle body has an air bypass passage that
provides air for the engine during closed throttle idle.
The idle air control solenoid pintle protrudes into the
air bypass passage and regulates air flow through it.
The PCM adjusts engine idle speed by moving the
IAC solenoid pintle in and out of the bypass passage.
The adjustments are based on inputs the PCM
receives. The inputs are from the throttle position
sensor, crankshaft position sensor, coolant tempera-
ture sensor, MAP sensor, vehicle speed sensor and
various switch operations (brake, park/neutral, air
conditioning and power steering).
When engine rpm is above idle speed, the IAC is
used for the following functions:
• Off-idle dashpot
• Deceleration air flow control
• A/C compressor load control and power steering
(also opens the passage slightly before the compres-
sor is engaged so that the engine rpm does not dip
down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:
• Gear position
• ECT Sensor
• Battery voltage
• Ambient/Battery Temperature Sensor
• VSS
• TPS
• MAP Sensor
REMOVAL
REMOVAL
When servicing throttle body components, always
reassemble components with new O-rings and seals
where applicable. Never use lubricants on O-rings or
seals, damage may result. If assembly of component
is difficult, use water to aid assembly. Use care when
removing hoses to prevent damage to hose or hose
nipple.
(1) Disconnect negative cable from battery.
Fig. 27 Idle Air Control Solenoid—Typical
14 - 34
FUEL INJECTION
PL/SRT-4
FUEL INJECTOR (Continued)
(2) Remove electrical connector from idle air con-
trol motor.
(3) Remove idle air control motor mounting screws
(Fig. 28).
(4) Remove motor from throttle body. Ensure the
O-ring is removed with the motor.
REMOVAL - 2.4L SRT-4
When servicing throttle body components, always
reassemble components with new O-rings and seals
where applicable. Never use lubricants on O-rings or
seals (Fig. 29), damage may result. If assembly of
component is difficult, use water to aid assembly. Use
care when removing hoses to prevent damage to hose
or hose nipple.
(1) Disconnect negative cable from battery.
(2) Relocate the air cleaner box.
(3) Remove electrical connector from idle air con-
trol motor.
(4) Remove idle air control motor mounting screws
(Fig. 30).
(5) Remove motor from throttle body. Ensure the
O-ring is removed with the motor.
INSTALLATION
INSTALLATION
When servicing throttle body components, always
reassemble components with new O-rings and seals
where applicable. Never use lubricants on O-rings or
seals, damage may result. If assembly of component
is difficult, use water to aid assembly. Use care when
removing hoses to prevent damage to hose or hose
nipple.
(1) The new idle air control motor has a new
O-ring installed on it. If pintle measures more than 1
inch (25 mm) it must be retracted. Use the DRB III
t
Idle Air Control Motor Open/Close Test to retract the
pintle (battery must be connected.)
(2) Carefully place idle air control motor into
throttle body.
(3) Install mounting screws. Tighten screws to 4.5
N·m (40 in. lbs.) torque.
(4) Connect electrical connector to idle air control
motor
(5) Connect negative cable to battery.
Fig. 28 Servicing Idle Air Control Motor
Fig. 29 IDLE AIR CONTROL MOTOR
Fig. 30 TPS AND IAC LOCATION
1 - Throttle Position Sensor
2 - Idle Air Control Motor
PL/SRT-4
FUEL INJECTION
14 - 35
IDLE AIR CONTROL MOTOR (Continued)
INSTALLATION - 2.4L SRT-4
(1) Install the IAC to the throttle body (Fig. 31).
(2) Tighten mounting screw to 5.1 N·m (45 in. lbs.)
torque.
(3) Attach electrical connector to the IAC and lock
connector.
(4) Relocate the air cleaner box and install fasten-
ers.
(5) Connect the negative battery cable.
INLET AIR TEMPERATURE
SENSOR
DESCRIPTION
The IAT sensor attaches to the clean air duct (Fig.
32).
The IAT Sensor is a Negative Temperature Coeffi-
cient (NTC) Sensor that provides information to the
PCM regarding the temperature of the air entering
the intake manifold.
REMOVAL
(1) Disconnect the negative battery cable.
(2) Disconnect the inlet air temperature sensor
(3) Remove the air cleaner lid.
(4) Disconnect the inlet air tube from the throttle
body.
(5) Remove inlet air tube from air cleaner lid.
INSTALLATION
(1) Install inlet air tube to air cleaner lid and
tighten clamp.
(2) Install inlet air tube to throttle body and
tighten clamp.
(3) Install air cleaner lid to air cleaner box.
(4) Connect the inlet air temperature sensor elec-
trical connector.
(5) Connect the negative battery cable.
MANIFOLD TUNE VALVE
DESCRIPTION
The valve connects both passages of the intake
manifold plenum (Fig. 33). It is an elecrtic motor.
OPERATION
The PCM controls the MTV solenoid. The manifold
tuning valve optimizes acoustical tuning of the
Fig. 31 IAC REMOVE/INSTALL
Fig. 32 Inlet Air Temperature Sensor
Fig. 33 Manifold Tuning Valve
14 - 36
FUEL INJECTION
PL/SRT-4
IDLE AIR CONTROL MOTOR (Continued)
intake system during wide open throttle operation
throughout the RPM range.
REMOVAL
(1) Disconnect the negative battery cable.
(2) Tie the upper radiator hose back to gain access
to the Manifold Tuning Valve (MTV).
(3) Remove the 3 bolts from the rear power steer-
ing bracket.
(4) Remove the bracket (Fig. 34).
(5) Remove the 2 bolts from the MTV (Fig. 35).
NOTE: When removing the MTV do not loose the
spring that is between the valve and intake mani-
fold.
(6) Remove the MTV.
(7) Disconnect the electrical from the MTV and
bracket (Fig. 36).
INSTALLATION
(1) Connect the electrical connector to the MTV
and bracket (Fig. 36).
NOTE: When removing the MTV do not loose the
spring that is between the valve and intake mani-
fold.
(2) Install the MTV. Align the slot in the valve
with the tab on the intake manifold. Do not forget to
install the spring.
(3) Install the 2 bolts to the MTV (Fig. 35).
(4) Install the bracket (Fig. 34).
(5) Install the 3 bolts for the rear power steering
bracket.
(6) Untie the upper radiator hose.
(7) Connect the negative battery cable.
MAP SENSOR
DESCRIPTION
The MAP sensor mounts to the intake manifold
(Fig. 37).
The MAP sensor signal is provided from a single
piezoresistive element located in the center of a dia-
phragm. The element and diaphragm are both made
of silicone. As the pressures changes the diaphragm
moves causing the element to deflect which stresses
the silicone. When silicone is exposed to stress its
resistance changes. As manifold vacuum increases,
the MAP sensor input voltage decreases proportion-
ally. The sensor also contains electronics that condi-
Fig. 34 POWER STEERING BRACKET
Fig. 35 MANIFOLD TUNING VALVE (MTV)
Fig. 36 ELECTRICAL CONNECTOR
PL/SRT-4
FUEL INJECTION
14 - 37
MANIFOLD TUNE VALVE (Continued)
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