Excursion 2WD V10-6.8L VIN Z CNG (2003)
Information Bus: Description and Operation
Communications Network
Description and Operation.
COMMUNICATIONS NETWORK
The module communication network components - Excursion
-
overhead trip computer (OTC) (optional)
-
restraint control (RCM) module
-
parking aid module (optional)
-
vehicle security module
-
4-wheel anti-lock brake (4WABS) control module
-
powertrain control module (PCM)
-
passive anti-theft system (PATS) module
-
4-wheel drive (4WD) control module
-
electronic automatic temperature control (EATC) module
-
driver seat (DSM) module
-
instrument cluster
The module communication network components - Super Duty Series F-250, F-350, F-450, F-550
-
overhead trip computer (OTC) (optional)
-
restraint control (RCM) module
-
parking aid module (optional)
-
vehicle security module
-
4-wheel anti-lock brake (4WABS) control module (optional)
-
4-wheel drive (4WD) control module
-
powertrain control module (PCM)
-
auxiliary powertrain control module (APCM) (optional)
-
air suspension control module (optional)
-
instrument cluster
Principles of Operation (How Does It Work?)
PRINCIPLES OF OPERATION
The vehicle has three module communication networks:
-
standard corporate protocol (SCP) communications network
-
international standards organization (ISO) 9141 communications network
-
UART based protocol (UBP) communications network
The diagnostic tool connects to all three networks through the data link connector (DLC). This makes diagnosis and testing of these systems easier by
allowing one smart tester to be able to diagnose and control any module on the three networks from one connector. The DLC can be found under the
instrument panel between the steering column and the radio.
The ISO 9141 communications network does not permit intermodule communication. When the diagnostic tool communicates to modules on the 150
9141 communication network, the diagnostic tool must request all information or initiate module commands.
The ISO 9141 communications network will not function if the wire is shorted to ground or battery voltage. Also, if one of the modules on the ISO 9141
communications network loses power or shorts internally, communications to that module will fail.
The SCP communications 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 voltage, or if some but not all termination resistors are lost.
The UBP communications network will not function if the wire is shorted to ground or voltage. The UBP is different from the ISO communication
network in that it allows intermodule communication.
The four-wheel anti-lock brake system (4WABS) module is on the ISO 9141 communication network. The module controls brake pressure to the wheels
to keep the vehicle under control while braking.
The 4-wheel drive (4WD) control module (if equipped) is on the ISO 9141 communication network. The 4WD control module controls the four wheel
drive functions for the vehicle.
The restraint control module (RCM) control the deployment of the air bags based on sensor input. The RCM is on the ISO 9141 network. Refer to Air
Bag Systems.
