F 150 2WD V8-4.6L VIN W (2007)
ISO 9141 Network Operation
The ISO 9141 communication network is a single wire network, used for diagnostic purposes only.
The ISO 9141 communication network is used for the following modules:
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RCM
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Parking aid module
UART-Based Protocol (UBP) Communication Network
The UBP communication network is a single wire network. In addition to scan tool communication, this network allows sharing of information
between all modules on the network.
The UBP communication network is used for the following modules:
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DSM
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EATC
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Instrument cluster
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VSM
HS-CAN Network Operation
The HS-CAN network uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this
network allows sharing of information between all modules on the network.
The HS-CAN is a high speed communication network used for the following modules:
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PCM
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ABS module
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Instrument cluster
Network Termination
The CAN network uses a network termination circuit to improve communication reliability. The network termination of the CAN bus takes place
inside the termination modules by termination resistors. Termination modules are located at either end of the bus network. As network messages are
broadcast, in the form of voltage signals, the network voltage signals are stabilized by the termination resistors. Each termination module has a 120
ohm resistor across the positive and negative bus connection in the termination module. With two termination modules on each network, and the 120
ohm resistors located in a parallel circuit configuration, the total network impedance, or total resistance is 60 ohms.
Network termination improves bus message reliability by:
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stabilizing bus voltage.
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eliminating electrical interference.
Gateway Module
The instrument cluster is the gateway module, translating HS-CAN to UBP and vice versa. This information allows a message to be distributed
throughout both networks. The instrument cluster is the only module on this vehicle that has this ability.
