F 150 2WD Pickup V8-4.6L SOHC VIN W (1998)
Unlike the SCP network, the ISO 9141 network will not function if the wire is shorted to chassis ground or battery positive voltage (B+) Also, if one of
the modules on the ISO 9141 network loses power or shorts internally, communications to that module will fail. There are two modules on the SCP
network and four modules on the ISO 9141 network.
The Powertrain Control Module (PCM) is on the multiplex communication network. The PCM controls the engine for better fuel economy, emissions
control, and failure mode detection and storage.
The Natural Gas Vehicle Module (NGVM) calculates fuel level based on inputs from the fuel tank pressure sensor and the fuel tank temperature sensor.
The NGVM then provides a voltage signal to the instrument cluster to drive the fuel gage. The NGVM also has separate injector drivers to run the
injectors at the higher operating pressure of natural gas. The NGVM does not perform any calculations for this function; calibration for the injectors is
maintained in the PCM.
The Integrated Air Bag Diagnostic Monitor (IABM) is on the ISO 9141 network. The IABM controls the deployment of the air bags based on sensor
input.
The Generic Electronic Module (GEM)/Central Timer Module (CTM) is on the ISO 9141 network. The GEM is equipped on vehicles with 4-wheel
drive or power windows. The CTM is equipped on vehicles with 2-wheel drive or vehicles without power windows. The GEM controls a variety of
systems:
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Windshield wipers.
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Courtesy lamps.
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4-wheel shift on the fly.
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One touch down power windows.
The Remote Anti-theft Personality (RAP) module is on the ISO 9141 network. The RAP module controls the anti-theft and keyless remote entry of the
vehicle. For more information, REFER to the Remote Anti-theft Personality system.
The 4-Wheel Anti-lock Brake (4WABS) control module is on the ISO 9141 network. The 4WABS control module controls the brake pressure to the
four wheels to keep the vehicle under control while braking. For more information, REFER to 4-Wheel Anti-lock Brake system.
