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+--- Thread: OBD-II Wiring (/showthread.php?tid=7078)
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OBD-II Wiring - Rabster - 15-02-2019
ok so here is a random question i want to connect 2 OBD units to my car circuit
one is the HKS Camp2 Unit
the other is a OBD Reader on the computer
i tried just splicing the wiring in but it seems you can only have one item running at a time which doesn't help me as i NEED both
anyone had any experience with this ?
Rabs
OBD-II Wiring - toxo - 15-02-2019
Can't do it as far as I'm aware. It's not a bus it's a serial datastream so you can't have multiple devices on it.
OBD-II Wiring - Rabster - 15-02-2019
grrr
OBD-II Wiring - toxo - 15-02-2019
If you're connecting a PC to it can't you just emulate everything the HKS unit does on there and do away with it?
OBD-II Wiring - Rabster - 15-02-2019
not easily as there are extra sensors
OBD-II Wiring - toxo - 15-02-2019
The only exception I can think of was if your ECU supported 2 different OBD2 protocols. Most I've come across use KWP2000 but if you (theoretically) had an ECU that would answer to either one of the SAE protocols *and* either ISO or KWP as well then that might work. You can't use any other protocol with CAN (presuming the ECU would support it anyway) because the pins used for CAN operation on the OBD2 port are battery +ve/-ve for all other protocols!
This is unlikely because the SAE protocols are mainly used by US vehicles.
OBD-II Wiring - toxo - 15-02-2019
Replace everything your HKS CAMP currently reads via OBD with external sensors?
OBD-II Wiring - Moley - 15-02-2019
slightly :offtopic: what kind of cable do you need to connect the OBD2 reader from the car to a lap top ??
OBD-II Wiring - Rabster - 15-02-2019
looks like i could chuck a switch on it maybe a relay to cut the signal from one unit and send it to the other....
OBD-II Wiring - toxo - 15-02-2019
Moley slightly :offtopic: what kind of cable do you need to connect the OBD2 reader from the car to a lap top ??
You need a USB to OBD2 adaptor Moley, something like this:
http://www.talktomycar.co.uk/products/interfaces/interfaces.htm
There are cheaper ones about that do exactly the same job, that page is just an example.