Chrysler Crossfire. Manual - part 689

INSTALLATION

1. Install the fuel injectors (4) to the fuel rail (2) by gently pushing the fuel injector into the fuel rail (2). Install the

retaining clips.

2. Install the fuel rail (2) with the fuel injectors (4) by moving the fuel rail (2) side to side and pushing downward

towards the intake manifold.

3. Install the fuel rail retaining bolts. Tighten to 9 N·m (80 in. lbs.).

4. Install the fuel injector harness (6) to the fuel injectors (4) then install the fuel injector electrical connector retain-

ing clips (5).

5. Connect the fuel feed line (3). Tighten to 38 N·m (28 ft. lbs.).

6. Install the wiring harness cover (1), then install the wiring harness cover retaining screw.

7. Install the engine cover. (Refer to 9 - ENGINE/AIR INTAKE SYSTEM/AIR CLEANER HOUSING - INSTALLA-

TION).

8. Connect the negative battery cable.

FUEL INJECTION

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FUEL PUMP RELAY

DESCRIPTION

The Fuel Pump Relay is housed within the Relay Con-
trol Module (1) located inside the Control Module Box
(3) in the engine compartment. The Relay Control
Module also contains the Fuses (2) for the Fuel Pump
Relay circuitry. The relays in the Relay Control Module
cannot be adjusted or repaired. If faulty or damaged,
the entire module unit must be replaced as an
assembly.

OPERATION

The Fuel Pump Relay supplies battery voltage to the Fuel Pump. The Fuel Pump Relay power circuit contains a
fuse. The fuse is located in the Relay Control Module. Refer to the Wiring Diagrams for circuit information.

The PCM controls the Fuel Pump Relay by switching the ground path for the coil 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 energizes the Fuel Pump. If the Crankshaft Position Sensor does not detect engine rotation, the
PCM de-energizes the relay.

INTAKE AIR TEMPERATURE SENSOR

DESCRIPTION

The Intake Air Temperature (IAT) Sensor (1,6,2) is
integrated into the Mass Air Flow (MAF) Sensor. The
IAT cannot be serviced separately. Refer to the MAF
service procedures for removal. (Refer to 14 - FUEL
SYSTEM/FUEL INJECTION/MANIFOLD AIR FLOW
(MAF) SENSOR - REMOVAL).

The IAT senses the inlet air temperature to the engine.
The IAT then sends a signal to the Powertrain Control
Module.

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FUEL INJECTION

OPERATION

The Intake Air Temperature (IAT) Sensor has a Negative Temperature Coefficient (NTC) integrated into the IAT. The
IAT alters its electrical resistance in line with the intake air temperature. When the temperature increases, the resis-
tance reading drops. As the temperature drops the resistance increases. The IAT sends this resistance reading to
the PCM to help calculate the amount of fuel that is needed. The IAT is integrated into the Mass Air Flow (MAF)
Sensor and cannot be serviced individually. Refer to the MAF service procedures for removal and installation of the
IAT/MAF.

REMOVAL

The normally aspirated 3.2L engine has the Intake Air Temperature (IAT) Sensor located inside the Mass Air Flow
(MAF) Sensor. The IAT Sensor can not be serviced separately. The IAT Sensor and the MAF Sensor must be
replaced as an assembly. For proper removal procedure, refer to MAF sensor removal.(Refer to 14 - FUEL SYS-
TEM/FUEL INJECTION/MANIFOLD AIR FLOW (MAF) SENSOR - REMOVAL).

REMOVAL - SRT

1. Disconnect the negative battery cable.

2. Remove the engine cover (1). Grasp both corners

of the engine cover, and pull up firmly.

FUEL INJECTION

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3. Remove the upper air cleaner housing. (Refer to 9

- ENGINE/AIR INTAKE SYSTEM/AIR CLEANER
HOUSING - REMOVAL).

4. Disconnect the intake air temperature sensor (1)

harness connector.

5. Remove the intake air temperature sensor (1).

INSTALLATION

The normally aspirated 3.2L engine has the Intake Air Temperature (IAT) Sensor located inside the Mass Air Flow
(MAF) Sensor. The IAT Sensor can not be serviced separately. The IAT Sensor and the MAF Sensor must be
replaced as an assembly. For proper installation procedure, refer to MAF sensor installation.(Refer to 14 - FUEL
SYSTEM/FUEL INJECTION/MANIFOLD AIR FLOW (MAF) SENSOR - INSTALLATION).

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FUEL INJECTION

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