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Discussion Starter · #1 ·
What's a dual Can/bus? Never heard of that before....



I moved this post over here I thought it was your area of expertise.


I saw you had a technical question posted in the wrong forum, as a courtesy to you I moved it here.

Thanks for your participation.

NYEdited by: GMC-2002-Dmax

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dmaxalliTech said:

Hope that clears things up


ps. the connectors that the juice plug into is likely what a two can/ bus is referrring to. There are in the Can data line and they are bussed connectors

That cleared it up for me, none of that GM training needed now! Thanks!

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All that Mr. Goodwrench training and this is what it comes down too??

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CAN BUS is the data communications system/wiring used by the Duramax ECM. It's the method used for internal computer/sensor communication.

It is also the reason the 2003 GM truck electronics are different from previous model years. It is basically a communications protocol that allows the vehicle computers to communicate with controllers throughout the vehicle over the same wires. This eliminates a lot of wiring in that all you need is the one control wire and power at each device. Kinda of like USB on your computer. You can daisy chain devices along one wire. The devices themselves have microchips that recieve signals thru the "CAN BUS" that tell it to turn on off, or whatever.

A BUS in electrical terms is an "electron highway" used by multiple devices/computers. So you have a Controller Area Network (CAN) running on a BUS.

Techno Jargon.....

Controller Area Network (CAN)

The CAN bus is a Balanced (differential) 2-wire interface running over either a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable. Each node uses a Male 9-pin D connector. The Bit Encoding used is: Non Return to Zero (NRZ) encoding (with bit-stuffing) for data communication on a differential two wire bus. The use of NRZ encoding ensures compact messages with a minimum number of transitions and high resilience to external disturbance.

Here are a few places to read up on it if interested...
Bosch (original developer)

More Bosch

"A typical vehicle can contain two or three separate
CANs operating at different transmission rates.
A low-speed CAN running at less than 125 Kbps
usually manages a car’s “comfort electronics,” like
seat and window movement controls and other user
interfaces. Generally, control applications that are
not real-time critical use this low-speed network
segment. Low-speed CANs have an energy-saving
sleep mode in which nodes stop their oscillators
until a CAN message awakens them. Sleep mode
prevents the battery from running down when the
ignition is turned off.
A higher-speed CAN runs more real-time-critical
functions such as engine management, antilock
brakes, and cruise control. Although capable of a
maximum baud rate of 1 Mbps, the electromagnetic
radiation on twisted-pair cables that results
from a CAN’s high-speed operation makes providing
electromagnetic shielding in excess of 500
Kbps too expensive.
CAN is a robust, cost-effective general control
network, but certain niche applications demand
more specialized control networks. For example,
X-by-wire systems use electronics, rather than
mechanical or hydraulic means, to control a system.
These systems require highly reliable networks."Edited by: hoot

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ISurvivedNMU said:

Dam Hoot,

where do you get all this, .... well ...Stuff.....
Some I actually write myself from past reading and other stuff I find with the ultimate search engine..... google

Everything above "Techno Jargon" is from memory, the rest is just research, cut, paste. Edited by: hoot

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Hey eric, try to describe a juice box, 4" pipe, and lets see a picture of a stealth tuner.
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