This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
en:can [2023/02/04 22:02] obd_diagnose |
en:can [2023/12/13 23:37] (current) obd_diagnose |
||
---|---|---|---|
Line 16: | Line 16: | ||
Example of a 500kBit/s high-speed CAN with 11-bit ID (CAN 2.0A) on an engine control unit: | Example of a 500kBit/s high-speed CAN with 11-bit ID (CAN 2.0A) on an engine control unit: | ||
- | {{ : | + | {{: |
As you can see, CAN-H and CAN-L are in phase opposition. The advantage is that this eliminates common-mode interference: | As you can see, CAN-H and CAN-L are in phase opposition. The advantage is that this eliminates common-mode interference: | ||
- | {{ : | + | {{: |
- | Usually there are several CAN buses in the vehicle, e.g. CAN drive, CAN comfort and CAN infotainment, | + | Usually there are several CAN buses in the vehicle, e.g. CAN drive, CAN comfort and CAN infotainment, |
In some vehicles (Ford models), e.g. CAN drive is also directly connected to the [[obd-2]] socket. | In some vehicles (Ford models), e.g. CAN drive is also directly connected to the [[obd-2]] socket. | ||
- | A popular physical connection for CAN is also [[cia-ds102-1]] . | + | A popular physical connection for CAN is also [[cia-ds102-1]]. |
Example of recorded CAN messages (CAN bus sniffing) with Kaufmann Automotive GmbH KCANMonitor: | Example of recorded CAN messages (CAN bus sniffing) with Kaufmann Automotive GmbH KCANMonitor: | ||
- | {{ : | + | {{: |
Depending on the speed and bus load of the respective CAN bus, a very large number of messages can accumulate that have to be processed on the bus during " | Depending on the speed and bus load of the respective CAN bus, a very large number of messages can accumulate that have to be processed on the bus during " | ||
- | CAN is used for on-board diagnostics in most vehicles from 2008 onwards with [[obd-2]] . | + | CAN is used for on-board diagnostics in most vehicles from 2008 onwards with [[obd-2]] |
+ | |||
+ | At least two nodes must be used for communication on a CAN bus. Since a sent message must be acknowledged by a receiver in the ACK bit, the sending controller sends out an error flag if the message was not properly ACK-checked. | ||
Links to the topic: | Links to the topic: | ||
Line 41: | Line 43: | ||
[[https:// | [[https:// | ||
+ | |||
+ | [[https:// | ||