Natural Gas Cluster

INSTRUMENT CLUSTER

The natural gas fuel indication system consists of the following components:
- the natural gas vehicle (NGV) module
- the fuel gauge located in the instrument cluster
- the fuel tank pressure sensor
- the fuel tank temperature sensor

PRINCIPLES OF OPERATION

WARNING:
- Do not modify the system configuration or components, or install new components with parts not specially designed for use with natural gas. Ford Motor Company has specially designed the materials, components, and system configuration for the 5.4L natural gas vehicle, and each particular system is precisely calibrated for efficient operation. The use of different parts or materials can produce an untested configuration that could result in fire, personal injury, or cause engine damage. Failure to follow these instructions may result in personal injury or death.
- It is important that the natural gas vehicle be correctly maintained by Ford natural gas trained personnel. If a concern occurs, it is important that correctly trained personnel diagnose the cause. If the problem relates to the fuel system, correct new part installation is imperative to keep the vehicle operating at normal performance. Natural gas components and gasoline fuel components are not interchangeable. If the vehicle is not repaired in accordance with natural gas-fueled vehicle procedures, damage can occur and the warranty may be invalidated. Failure to follow these instructions may result in personal injury or death.

NOTE: All standard production components and systems receive routine repairs under base warranty procedures.

Natural Gas Vehicle (NGV) Module
The NGV module assembly:
- consists of a 90-pin module and a bracket and four retainers.
- houses the unique electronics required for natural gas fuel systems.
- is located on the LH inner fender.

The NGV module carries out the following functions:
- injector drivers: the NGV module accepts eight unmodified injector signals from the powertrain control module (PCM) and allows a peak-and-sustain current to flow through the injector solenoids.
- fuel gauge driver: the NGV module uses fuel tank temperature and fuel tank pressure inputs to calculate the density of the fuel. A look-up table is used to determine the output signal to the fuel gauge.

Fuel Tank Pressure Sensor
The fuel tank pressure sensor:
- contains integral solid state circuitry that outputs a voltage signal that is proportional to pressure.
- has an output that is linear from 0 kPa (0 psi) up to 34,473.79 kPa (5000 psi).
- is mounted in the rear fuel tank solenoid valve.

Fuel Tank Temperature Sensor
The fuel tank temperature sensor:
- changes resistance in response to the temperature of the fuel in the fuel tank; as the surrounding temperature increases, the resistance decreases (the voltage signal also decreases).
- provides a signal to the NGV module that indicates the temperature of the fuel.
- is mounted in the rear fuel tank solenoid valve.