what obd2 protocol do we have?

I dont have my ultragauge anymore, and it used to say something about versions, bits, relating to the CAN protocol...

Can anyone get a pic of this screen for me on startup?

Or tell me what the protocol is?

Prease?


I've searched some, but my phone doesnt play well with the search button and keeps closing the browser

 

The Protocol is Can Bus.

Appears to have gone CAN Bus in 2005 and later.

 

I think I got it... We are 11 bit

 

No. All vehicles do not use CAN Bus. It was only required in the USA since 2008.

OBD-II signal protocols

There are five signaling protocols that are permitted with the OBD-II interface. Most vehicles implement only one of the protocols. It is often possible to deduce the protocol used based on which pins are present on the J1962 connector:

• SAE J1850 PWM (pulse-width modulation — 41.6 kB/sec, standard of the Ford Motor Company)
  • pin 2: Bus+
  • pin 10: Bus–
  • High voltage is +5 V
  • Message length is restricted to 12 bytes, including CRC
  • Employs a multi-master arbitration scheme called 'Carrier Sense Multiple Access with Non-Destructive Arbitration' (CSMA/NDA)
• SAE J1850 VPW (variable pulse width — 10.4/41.6 kB/sec, standard of General Motors)
  • pin 2: Bus+
  • Bus idles low
  • High voltage is +7 V
  • Decision point is +3.5 V
  • Message length is restricted to 12 bytes, including CRC
  • Employs CSMA/NDA
• ISO 9141-2. This protocol has an asynchronous serial data rate of 10.4 kBaud. It is somewhat similar to RS-232; however, the signal levels are different, and communications happens on a single, bidirectional line without additional handshake signals. ISO 9141-2 is primarily used in Chrysler, European, and Asian vehicles.
  • pin 7: K-line
  • pin 15: L-line (optional)
  • UART signaling
  • K-line idles high, with a 510 ohm resistor to Vbatt
  • The active/dominant state is driven low with an open-collector driver.
  • Message length is Max 260Bytes. Data field MAX 255.
• ISO 14230 KWP2000 (Keyword Protocol 2000)
  • pin 7: K-line
  • pin 15: L-line (optional)
  • Physical layer identical to ISO 9141-2
  • Data rate 1.2 to 10.4 kBaud
  • Message may contain up to 255 bytes in the data field
• ISO 15765 CAN (250 kBit/s or 500 kBit/s). The CAN protocol was developed by Bosch for automotive and industrial control. Unlike other OBD protocols, variants are widely used outside of the automotive industry. While it did not meet the OBD-II requirements for U.S. vehicles prior to 2003, as of 2008 all vehicles sold in the US are required to implement CAN as one of their signaling protocols.
  • pin 6: CAN High
  • pin 14: CAN Low

All OBD-II pinouts use the same connector, but different pins are used with the exception of pin 4 (battery ground) and pin 16 (battery positive).

 

So which protocol do they use? I'm trying to find what the 2006 Tacoma has so I can gift a diagnostic tool, but I don't have access to the truck.

 

CAN Bus Protocol.

 

Cool information above. I've never come across those weird baud rates, only 250 & 500k I thought that all the connector pin outs where the standardized under J1939? Guess I should like, idk, actually read it lol.

Does anyone have a log of the all the messages on a second gen? I can't imagine there are very many, especially on chassis CAN since the truck is so god damn simple. I'm not sure how much is canbus vs dedicated circuitry, I'm sure looking at the wiring diagrams would give some indication. I'm gonna look at getting the service books pretty soon.

 

Nope.
There is also ISO9141-2 ("K" and "L"-line protocol), as well as J1850. These would be available on different pins of the ODB2 connector.
CAN "controller area network" is on pins 6 and 14. K-line is on pin 7, L-line is on pin 15, J1850 is on pins 2 and 10.

 

Nope. See chart above that somebody else posted. Its actually more of an age thing.
J1850 was favored by Ford and GM.
ISO9141-2 (K-line, L-line) was favored by Chrysler, European, and Japanese companies.
CAN was developed by BOSCH (German), and was only made mandatory in the US in 2008. Interesting thing is that CAN didn't even exist back in 1996 when ODB-II was made mandatory (US) -- that was added later!