Taurus X AWD V6-3.5L (2009)
Information Bus: Initial Inspection and Diagnostic Overview
Special Tools Used With Diagnostics
Communications Network
Principles of Operation
Communications Network
Principles of Operation
NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
Vehicle communication utilizes both ISO 9141 and Controller Area Network (CAN) communications. ISO 9141 is used for diagnostic use only, and
CAN is a method for transferring data among distributed electronic modules via a serial data bus.
The vehicle is equipped with 3 module communication networks:
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ISO 9141
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Medium Speed Controller Area Network (MS-CAN)
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High Speed Controller Area Network (HS-CAN)
ISO 9141 Communications Network
The ISO 9141 communications network is a single wire network. The ISO 9141 communications network does not permit intermodule communication
and is used for diagnostic use only. The only module on the ISO 9141 network is the PAM. When the scan tool communicates to the PAM, the scan tool
must request all information, the module cannot initiate communications.
The following fault chart describes the specific ISO 9141 network failures and their resulting symptom: