F 350 2WD Super Duty V8-7.3L DSL Turbo VIN F (1999)
by one connector called the Data Link Connector (DLC). This makes troubleshooting these systems easier by allowing one smart tester to be able to
diagnose and control any module on the two networks from one connector. The DLC can be found under the instrument panel between the steering
column and the radio.
The ISO 9141 communication network does not permit inter-module communication. When NGS Tester communicates to modules on the ISO 9141
communication network, NGS Tester must ask for all information; the modules cannot initiate communications.
The Standard Corporate Protocol (SCP) communication network will remain operational even with the severing of one of the bus wires.
Communications will also continue if one of the bus wires is shorted to ground or battery positive voltage (B+), or if a termination resistor is lost. This
faulted condition is detected and reported to the host by the module's network bus interface circuits.
Unlike the SCP communication network, the ISO 9141 communication network will not function if the wire is shorted to ground or battery positive
voltage (B +). Also, if one of the modules on the ISO 9141 communication network loses power or shorts internally, communications to that module or
all modules will fail.
The 4-wheel and the rear anti-lock brake control modules are connected to the ISO 9141 communication network. The module controls the brake
pressure to the wheels to keep the vehicle under control while braking.
The Electronic Crash Sensor (ECS) module is connected to the ISO 9141 communication network. The ECS module controls the deployment of the air
bags based on sensor input.
The Overhead Trip Computer (OTC) is connected to the ISO 9141 communication network. The OTC computes and displays in metric or English:
average fuel economy, distance to empty, and compass heading.
The GEM is on the ISO 9141 network, and it 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 (OTD) power windows, etc.
The Powertrain Control Module (PCM) is connected on the SCP communication network. The PCM controls the engine performance, electronic
ignition, emission controls and on board diagnostics.
The Auxiliary Powertrain Control Module (APCM) is connected on the SCP communication network. The APCM provides an operator interface to the
drive-by-wire powertrain control system to effect charge protection, rpm control, and manual throttle control between 1300 and 2500 rpm.
