YES NOPE9 wrote:
>I have been asked to look into the feasibility of building some
> modules to support "Car Sharing".
> Car Sharing allows a customer to use the internet to reserve the use
> of a car for a selected number of hours.  The customer goes to the
> car , presents some electronic "ID" , the car lets the customer into
> the car and starts the engine.  The car has a log of locations it has
> travelled to , how it has been driven , and what the mileage is.
>
> Is OBD II a standard on cars built after 1992 ?

No, it is only standard on cars and light trucks (defined as GVW < 8500 lb) 
MY1996 and newer.


> Will OBD II provide odometer readings ?

This is not part of OBD-II, but as Neil said if you only need "relative" 
odometer readings, you can continuously integrate speed over time. The 
results can be very accurate.


> Will OBD II provide engine RPM info ?
> Will OBD II provide speedometer info ?

Yes, in fact I'm yet to see a single OBD-II compliant vehicle that did not 
support either of those parameters.


> Will OBD II interact with door locks ?

No, but the same bus is often used for inter-module communications 
(especially on older Ford and GM vehicles that use the J1850 protocols). On 
newer cars it is often more difficult because they use a separate bus.


> Will OBD II shut down an engine ?

There are two ways to accomplish this.

We found that on some J1850 vehicles (ex: early 2000s Chevy trucks) that use 
the OBD bus for communication between the engine & transmission modules, it 
is possible to stall the engine by putting the bus in a dominant state 
(thereby inhibiting communication). Sometimes the engine stalls just because 
a long message (like the VIN) was requested by the tester.

One engineer told me how he managed to record the message sequence for 
unlocking doors by hooking up a sniffer, then calling OnStar and telling 
them that he's been locked out of his vehicle. OnStar was recently used to 
remotely disable a vehicle involved in a high speed chase for the first 
time. Use your imagination. ;)

Best regards,

Vitaliy Maksimov
ScanTool.net, LLC
+1 623 582-2366
http://www.scantool.net 

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