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OBD-II Wiring

OBD-II Wiring

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Rabster
Posting Freak
10,234
15-02-2018, 09:16 AM
#1
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
Rabster
15-02-2018, 09:16 AM #1

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

toxo
Posting Freak
4,843
15-02-2018, 09:36 AM
#2
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.
toxo
15-02-2018, 09:36 AM #2

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.

Rabster
Posting Freak
10,234
15-02-2018, 09:48 AM
#3
grrr
Rabster
15-02-2018, 09:48 AM #3

grrr

toxo
Posting Freak
4,843
15-02-2018, 09:50 AM
#4
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?
toxo
15-02-2018, 09:50 AM #4

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?

Rabster
Posting Freak
10,234
15-02-2018, 09:55 AM
#5
not easily as there are extra sensors
Rabster
15-02-2018, 09:55 AM #5

not easily as there are extra sensors

toxo
Posting Freak
4,843
15-02-2018, 09:55 AM
#6
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.
toxo
15-02-2018, 09:55 AM #6

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.

toxo
Posting Freak
4,843
15-02-2018, 09:56 AM
#7
Replace everything your HKS CAMP currently reads via OBD with external sensors?
toxo
15-02-2018, 09:56 AM #7

Replace everything your HKS CAMP currently reads via OBD with external sensors?

Moley
Posting Freak
6,230
15-02-2018, 10:30 AM
#8
slightly :offtopic: what kind of cable do you need to connect the OBD2 reader from the car to a lap top ??

Lexus IS200 Mods--TTE Supercharger, Tein Superstreet Coilovers & EDFC, 6000K HID Lights, HKS Silent High Power Exhaust, DBA Front Discs, Kenwood DNX9240 Head Unit, 19" Rims, TRD Kit, FIGS Bonnet Struts, Greddy Pillar Pod & Defi Gauges, TTE Red ARBS . And Been To WIM twice
Moley
15-02-2018, 10:30 AM #8

slightly :offtopic: what kind of cable do you need to connect the OBD2 reader from the car to a lap top ??


Lexus IS200 Mods--TTE Supercharger, Tein Superstreet Coilovers & EDFC, 6000K HID Lights, HKS Silent High Power Exhaust, DBA Front Discs, Kenwood DNX9240 Head Unit, 19" Rims, TRD Kit, FIGS Bonnet Struts, Greddy Pillar Pod & Defi Gauges, TTE Red ARBS . And Been To WIM twice

Rabster
Posting Freak
10,234
15-02-2018, 10:42 AM
#9
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....
Rabster
15-02-2018, 10:42 AM #9

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....

toxo
Posting Freak
4,843
15-02-2018, 11:42 AM
#10
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/in...rfaces.htm

There are cheaper ones about that do exactly the same job, that page is just an example.
toxo
15-02-2018, 11:42 AM #10

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/in...rfaces.htm

There are cheaper ones about that do exactly the same job, that page is just an example.

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