2008 Ford Pickup F-150 System Wiring Diagrams

5.4L Engine Performance Circuit

Figure 26: 5.4L, Engine Performance Circuit (1 of 6)

This diagram illustrates the engine performance circuit for the 5.4L engine. It details various electrical connections, including:

• Powertrain Control Module (PCM): Connections to fuses, relays, and various sensors.
• Sensors: Engine speed sensor, throttle position sensor, manifold absolute pressure sensor, mass air flow sensor, and others.
• Actuators: Fuel injectors, ignition coils, cooling fans, and throttle control motor.
• Circuits: Power distribution, ground connections, communication lines (e.g., CAN bus), and various control circuits.
• Breakouts: Points where circuits can be accessed for testing or diagnostics, often labeled with specific connector numbers (e.g., C106, C218).

Key components and their connections are represented by lines indicating wire paths, with labels for wire color, gauge, and destination or source.

Figure 27: 5.4L, Engine Performance Circuit (2 of 6)

This section continues the engine performance circuit diagram, focusing on:

• Powertrain Control Module (PCM) Connections: Further details on PCM inputs and outputs.
• Four-Wheel Drive (4WD) Switch: Integration of the 4WD system into the engine control.
• Sensors: Crankshaft position sensor, camshaft position sensor, and others related to engine timing and operation.
• Ignition System: Connections to ignition coils (COP - Coil on Plug) and related control signals.
• Fuel System: Fuel pump module, fuel injectors, and associated wiring.
• Emissions Control: Evaporative emission (EVAP) system components and ventilation.

The diagram shows the routing of wires between the PCM, sensors, actuators, and other modules, using color-coded lines and numerical identifiers.

Figure 28: 5.4L, Engine Performance Circuit (3 of 6)

This part of the wiring diagram covers:

• Powertrain Control Module (PCM): Additional PCM interface points.
• Sensors: Heated oxygen sensors (HO2S), exhaust gas temperature sensor, and others.
• Actuators: Charge motion control valve (CMCV), electric fan clutch, and fuel injectors.
• Control Systems: Cruise control system, starting/charging system, and anti-theft system.
• Breakouts: Specific breakout points for diagnostic access.

The diagram highlights the complex interconnections within the engine management system.

Figure 29: 5.4L, Engine Performance Circuit (4 of 6)

This diagram focuses on:

• Sensors: Heated oxygen sensors (HO2S), ambient temperature sensor, and throttle position sensor.
• Actuators: Electronic throttle control (ETC) system components.
• Switches: Brake pedal position switch, floor shifter, and overdrive cancel switch.
• Fuel Pump Module: Wiring related to the fuel pump operation.
• Acceleration Pedal Position (APP) Sensor: Input from the accelerator pedal to the ETC system.

The diagram shows how driver inputs and environmental conditions are translated into signals for engine control.

Figure 30: 5.4L, Engine Performance Circuit (5 of 6)

This section details:

• Power Distribution: Fuses and relays supplying power to various components.
• Fuel Pump Relay: Control of the fuel pump.
• Transfer Case: Wiring for both mechanical and electronic shift-on-the-fly transfer cases.
• Sensors: Heated oxygen sensors (HO2S) and transmission temperature sensors.
• Heated Positive Crankcase Ventilation (PCV) Valve: Control of the PCV system.

The diagram illustrates the power flow and control signals for the powertrain and drivetrain components.

Figure 31: 5.4L, Engine Performance Circuit (6 of 6)

The final part of the series covers:

• Transmission Control: Solenoids for transmission shifting (Shift Solenoid A, Shift Solenoid B), torque converter clutch solenoid, and transmission pressure sensors.
• Digital Transmission Range (DTR) Sensor: Provides transmission gear selection information.
• Powertrain Control Module (PCM): Connections to transmission control modules and sensors.
• Sensors: Various transmission speed sensors and temperature sensors.
• Wiring Harnesses: Detailed routing and color coding for complex harnesses.

This diagram provides a comprehensive view of the electronic control systems for the transmission and its integration with the engine management.