Dodge Nitro. Manual — part 687

Fig. 130: Accelerator Pedal - Without Accelerator Pedal Position Sensor
Courtesy of CHRYSLER LLC

The accelerator pedal and APPS (Accelerator Pedal Position Sensor) are serviced as a complete assembly
including the bracket.

1. Disconnect electrical connector (3) at APPS.

2. Remove two accelerator pedal mounting bracket nuts (2).

3. Remove accelerator pedal/APPS assembly (1) from vehicle.

INSTALLATION

ACCELERATOR PEDAL - WITHOUT ACCELERATOR PEDAL POSITION SENSOR

2007 Dodge Nitro R/T

2007 ENGINE Fuel System - Nitro

Fig. 131: Accelerator Pedal - Without Accelerator Pedal Position Sensor
Courtesy of CHRYSLER LLC

The accelerator pedal and APPS (Accelerator Pedal Position Sensor) are serviced as a complete assembly
including the bracket.

1. Position accelerator pedal/APPS assembly over two mounting studs.

2. Install two accelerator pedal mounting bracket nuts (2).

3. Connect electrical connector (3) at APPS.

4. Before starting engine, operate accelerator pedal to check for any binding.

INJECTOR-FUEL

DESCRIPTION

FUEL INJECTOR

To control the injection valves, the new Common-Rail injectors use a rapid-action actuator made of piezo
crystals, which opens and closes the injection valve. The piezo crystals expand when electrical current is
applied to them, and contract when electrical current is turned off. The piezo actuator can switch up to five
times faster than a standard solenoid, because the movement of the piezo crystals does not rely on mechanical
components to transmit motion to the injection valve. This doubles the piezo injector's switching speed, and
enables fuel to be delivered with greater precision, which leads to lower emissions and better engine
performance.

STANDARD PROCEDURE

INJECTOR CLASSIFICATION

2007 Dodge Nitro R/T

2007 ENGINE Fuel System - Nitro

Fig. 132: Identifying Fuel Injector & ID Number
Courtesy of CHRYSLER LLC

Each fuel injector has a alphanumeric correction code number. This correction code is printed on the upper part
of the fuel injector (3) and is used to identify injector calibration. When replacing any fuel injectors, this code
must be entered into the vehicles Engine Control Module (ECM) using a diagnostic scan tool. In addition, if a
new ECM is installed, use a diagnostic scan tool to program all of the injector codes from the original fuel
injectors into the new ECM.

The classification of injectors describes the fuel flow quantity characteristic of the injector. This will make it
possible in the future to match the engine software to the tolerances of the injector within a more narrowly
graduated range. Classification can be clearly recognized, and assigned only by means of a scan tool.

These general conditions equally apply if, as a result of replacing an engine, carrying out repairs to the cylinder
head etc., the cylinder selective assignment of the injectors or the engine control module assignment may have
changed. If proper attention is not paid to the classification on these vehicles, driveability and smoking concerns
could result.

If an injector is replaced, it is then necessary to assign the classification code to the corresponding cylinder in
the ECM (Engine Control Module) with the appropriate scan tool.

INJECTOR CLASSIFICATION PROCEDURE

1. Turn ignition switch "ON".

2. Using the diagnostic scan tool, select ENGINE then MISCELLANEOUS.

3. Select LEARN INJECTORS.

4. Using the up and down arrows, scroll to the appropriate injector.

5. Using the right and left arrows, set injector to proper classification code.

6. Once injectors are classified, cycle ignition key to complete.

2007 Dodge Nitro R/T

2007 ENGINE Fuel System - Nitro

REMOVAL

REMOVAL

1. Disconnect negative battery cable at battery. Isolate end of cable.

2. Remove dress-up cover from top of engine.

3. Remove the high-pressure fuel lines from fuel rail to fuel injectors. Refer to REMOVAL .

CAUTION: Due to the complexity of the fuel injection system used on this engine,

refer to the Diesel Engine Diagnostics, and service any fuel system DTCs
prior to replacing any fuel injectors. If no DTCs are present, refer to the
Diesel Engine Diagnostic Test for Lack of Engine Power, and perform all
steps as directed prior to replacing any fuel injectors.

CAUTION: Cleanliness cannot be overemphasized when handling or replacing diesel

fuel system components. This especially includes the fuel injectors, high-
pressure fuel lines and fuel injection pump. Very tight tolerances are used
with these parts. Dirt contamination could cause rapid part wear and
possible plugging of fuel injector nozzle tip holes. This in turn could lead
to possible engine misfire. Always wash/clean any fuel system component
thoroughly before disassembly and then air dry. Cap or cover any open
part after disassembly. Before assembly, examine each part for dirt,
grease or other contaminants and clean if necessary. When installing new
parts, lubricate them with clean engine oil or clean diesel fuel only.

2007 Dodge Nitro R/T

2007 ENGINE Fuel System - Nitro