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commsystem.jpg '98-00 CV/MGM Communications

The vehicle has two module communication networks. The standard corporate protocol (SCP) communication network, which is an unshielded twisted pair cable (data bus plus, Circuit 914 [TN/OG] and data bus minus, Circuit 915 [PK/LB]) and the international standards organization (ISO) 9141 communications network which is a single-wire network(Circuit 70 [LB/W]). Both networks can be connected to the scan tool by one connector called the data link connector (DLC). This makes diagnosis and testing 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 intermodule communication. When the scan tool communicates to modules on the ISO 9141 communication network, the scan tool must ask for all information; the modules cannot initiate communications.

The 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 some but not all termination resistors are lost.

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 will fail.

For more info:
[url=http://www.supermotors.net/vehicles/registry/media/239902][img]http://www.supermotors.net/getfile/239902/thumbnail/network-speed-bar-graph.jpg[/img][/url]
commsystem.jpg | Hits: 5135 | Posted on: 1/30/05 | View original size (129.63 KB)

'98-00 CV/MGM Communications

The vehicle has two module communication networks. The standard corporate protocol (SCP) communication network, which is an unshielded twisted pair cable (data bus plus, Circuit 914 [TN/OG] and data bus minus, Circuit 915 [PK/LB]) and the international standards organization (ISO) 9141 communications network which is a single-wire network(Circuit 70 [LB/W]). Both networks can be connected to the scan tool by one connector called the data link connector (DLC). This makes diagnosis and testing 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 intermodule communication. When the scan tool communicates to modules on the ISO 9141 communication network, the scan tool must ask for all information; the modules cannot initiate communications.

The 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 some but not all termination resistors are lost.

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 will fail.

For more info:
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