Dodge Ram Truck 1500-2500-3500. Manual — part 1466

5.7L V-8

1. Clean out machined hole in engine block.

2. Apply a small amount of engine oil to sensor

o-ring.

3. Install sensor (4) into engine block with a slight

rocking and twisting action.

CAUTION: Before tightening sensor mounting bolt,
be sure sensor is completely flush to cylinder
block. If sensor is not flush, damage to sensor
mounting tang may result.

4. Install mounting bolt (3) and tighten to 28 N·m (21

ft. lbs.) torque.

5. Connect electrical connector to sensor.

6. Lower vehicle.

8.3L - SRT-10

1. Slide the sensor into the hole.

2. Install and tighten the mounting bolt to 11 N·m (95 in. lbs.) torque.

3. Connect the electrical connector to the sensor and lock.

INJECTOR - FUEL

DESCRIPTION

An individual fuel injector (1) is used for each individ-
ual cylinder.

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FUEL INJECTION - GAS

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OPERATION

FUEL INJECTOR

The top (fuel entry) end of the injector (1) is attached
into an opening on the fuel rail.

The fuel injectors are electrical solenoids. The injector
contains a pintle that closes off an orifice at the nozzle
end. When electric current is supplied to the injector,
the armature and needle move a short distance
against a spring, allowing fuel to flow out the orifice.
Because the fuel is under high pressure, a fine spray
is developed in the shape of a pencil stream. The
spraying action atomizes the fuel, adding it to the air
entering the combustion chamber.

The nozzle (outlet) ends of the injectors are positioned
into openings in the intake manifold just above the
intake valve ports of the cylinder head. The engine
wiring harness connector for each fuel injector is
equipped with an attached numerical tag (INJ 1, INJ 2 etc.). This is used to identify each fuel injector.

The injectors are energized individually in a sequential order by the Powertrain Control Module (PCM). The PCM will
adjust injector pulse width by switching the ground path to each individual injector on and off. Injector pulse width is
the period of time that the injector is energized. The PCM will adjust injector pulse width based on various inputs it
receives.

Battery voltage is supplied to the injectors through the ASD relay.

The PCM determines injector pulse width based on various inputs.

PCM OUTPUT

The nozzle ends of the injectors are positioned into openings in the intake manifold just above the intake valve ports
of the cylinder head. The engine wiring harness connector for each fuel injector is equipped with an attached
numerical tag (INJ 1, INJ 2 etc.). This is used to identify each fuel injector with its respective cylinder number.

The injectors are energized individually in a sequential order by the Powertrain Control Module (PCM). The PCM will
adjust injector pulse width by switching the ground path to each individual injector on and off. Injector pulse width is
the period of time that the injector is energized. The PCM will adjust injector pulse width based on various inputs it
receives.

Battery voltage (12 volts +) is supplied to the injectors through the ASD relay. The ASD relay will shut-down the 12
volt power source to the fuel injectors if the PCM senses the ignition is on, but the engine is not running. This
occurs after the engine has not been running for approximately 1.8 seconds.

The PCM determines injector on-time (pulse width) based on various inputs.

DR/DH

FUEL INJECTION - GAS

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REMOVAL

3.7L— 4.7L— 5.7L

1. Remove fuel rail. (Refer to 14 - FUEL SYSTEM/

FUEL DELIVERY/FUEL RAIL - REMOVAL)

2. Disconnect clip(s) that retain fuel injector(s) to fuel

rail (2).

8.3L - SRT-10

1. Release fuel system pressure. Refer to Fuel Pres-

sure Release Procedure in this section.

2. Remove the battery cover and disconnect negative

battery cable.

3. Remove the air cleaner assembly, refer to the

Engine/Air Intake System/Air Cleaner Housing for
more information.

4. Disconnect the electrical connector to the MAP

sensor and Coolant Temperature sensor.

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FUEL INJECTION - GAS

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5. Disconnect the electrical connector to the TPS and

Idle Air Control.

6. Remove the wiring harness from the wiring clips

under thew throttle body.

7. Disconnect the electrical connector from the fuel

injectors.

DR/DH

FUEL INJECTION - GAS

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