ODBII Interface

[retepsnikrep]

Having been looking at the ODBII protocols i'm toying with the idea of adding an ODBII interface to my phev BMS system. Now the standard ODBII codes are available, but the IMA specific ones are not. Now I have a scangauge so can capture the data it sends and recieves with my logic analyser to work out what codes are needed but it looks reasonably straightforward from reading wikapedia for the run of the mill data.

On-board diagnostics - Wikipedia, the free encyclopedia

# ISO 9141-2. This protocol has an asynchronous serial data rate of 10.4 kBaud. It is somewhat similar to RS-232, but that the signal levels are different, and that communications happens on a single, bidirectional line without extra 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 (though not RS-232 voltage levels)
* K-line idles high
* High voltage is Vbatt
* Message length is restricted to 12 bytes, including CRC

I suppose the only hope of learning the PID codes for the IMA functions is to 'Borrow' an official Honda diagnostic device and capture the data for the specific diagnostics available.

Any ideas or leads? Anyone have access to a genuine Honda device? I could send them an interceptor/analyser to capture the data if they are technically adept.

[Purplegate]

Not sure this will help, not even sure if the PID codes and CAN Bus codes are somewhat related, but with Mike D., for the MIMA Gen2, we were looking for a similar device in order to pick up the signals/codes for the assist & regen from the CAN Bus. A little different than Insight Gen1 as I think there was no CAN Bus yet, but I believe you are looking for pretty much a similar output.

We looked at the device from Microchip, but found out that the software had some issues and were unable to complete the "sniff analysis". We filed tickets to have it fixed but still waiting (since March...).

I recently contacted Kvaser, a company making also a possible device to read these codes, but no answer so far.

It seems difficult to find a low cost device that can do the job... Please update us if you find anything interesting !

[Mike Dabrowski 2000]

I believe that The official honda scan tool in 2000 was the mastertec, and they changed to a PC based system shortly after. At one of our hybrid classes I captured the mastertek data and made this file to show what was available.
http://99mpg.com/Data/resources/down..._scan_data.jpg
so with the correct request this is probably the comple list of available PID's
I have seen the mastertek scanners on e-bay, but one must have the correct adapters for honda, as well as up to date (as of 2000) software.

[retepsnikrep]

That's very interesting Mike and alludes to data passing between BCM & MCM and or available on request. The SOC % figure is interesting. If I win the lottery a proper Honda diag tools is top of my purchase list.

[Insightful Trekker]

The latest Honda scan tool is indeed PC based. Most any recent laptop will do. Software is available from Honda, for a price.

https://techinfo.honda.com/Rjanisis/logon.asp?Region=US

Whether or not it will yield the information to let you "crack" IMA codes is another kettle of fish. And non North American vehicles add another twist to the puzzle.

HTH!

[retepsnikrep]

I have just negotiated access to a bosch £8000 diagnostic tool so fingers crossed it has some of the info we require. As has been mentioned the bosch mastertech was the original tool during the relevant period I believe. Won't get to play with this for a month or so as too busy with other stuff.

[mahout]

Originally Posted by retepsnikrep

Having been looking at the ODBII protocols i'm toying with the idea of adding an ODBII interface to my phev BMS system. Now the standard ODBII codes are available, but the IMA specific ones are not. Now I have a scangauge so can capture the data it sends and recieves with my logic analyser to work out what codes are needed but it looks reasonably straightforward from reading wikapedia for the run of the mill data.

On-board diagnostics - Wikipedia, the free encyclopedia

# ISO 9141-2. This protocol has an asynchronous serial data rate of 10.4 kBaud. It is somewhat similar to RS-232, but that the signal levels are different, and that communications happens on a single, bidirectional line without extra 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 (though not RS-232 voltage levels)
* K-line idles high
* High voltage is Vbatt
* Message length is restricted to 12 bytes, including CRC

I suppose the only hope of learning the PID codes for the IMA functions is to 'Borrow' an official Honda diagnostic device and capture the data for the specific diagnostics available.

Any ideas or leads? Anyone have access to a genuine Honda device? I could send them an interceptor/analyser to capture the data if they are technically adept.

Both my OBDII testers display the codes not in their books but you can look up the codes in a Honda service manual.

[Mike Dabrowski 2000]

We do a scan tool shootout in our hybrid class, Master tek, Auto inginuity, OTC genesis,and several other tools are used to read PID's (not trouble codes), and we compare accuracy and how many of the PID's we can read. The results are pretty disappointing for our Insights. The mastertek data I pointed to was one of the more comprehensive of the non factory tools.
Many tools cant read any of the data, or they read it incorrectly.
It will be interesting to see how the Bosch tool works.

[Mr. Mik]

Originally Posted by Purplegate

...
...

It seems difficult to find a low cost device that can do the job... Please update us if you find anything interesting !

I have built a scanner according to instructions in a magazine called "Silicon Chip".

Unfortunately, it is not (yet?) working for my NHW10 Prius. Toyota used non-standard protocols for the NHW10 Prius (they did not exist at the time).

But the scanner did seem to work well with a later model Toyota Camry.

It can run a variety of freely available software (including open-source!) and runs multiple protocols. I built the version with USB interface.

It might well be worth a look into it by the Insight owners!

Here is a link: Silicon Chip Online - An OBDII Interface For A Laptop Computer

Quoted from the above link:


OBDII Interpreter: Main Features

• Enables checking for diagnostic trouble codes

• Clears trouble codes and Malfuntioning Indicator Lamp (MIL)

• Shows real-time data

• Extra features are software dependent

• Interpreter interfaces between the vehicle's OBDII port and a computer

• Serial or USB connection (via an adaptor) to computer

• Power for the OBDII Interpreter obtained via the vehicle's OBDII port

• Works with CAN, ISO, KPW, PWM and VPW protocols

[Mike Dabrowski 2000]

Communicating with the OBDII port is not the problem, it is knowing how to ask for and read the factory specific parameters.