Vehicle OBD Interface Definition

OBD-II interface on the car (mother ):

 

 

Elm327 pins:

2: SAE-J1850 PWM and SAE-1850 vpw bus (+) 4. Body Location 5. Signal Location

6. Can high (ISO 15765-4 and SAE-J2284) 7. ISO 9141-2 and ISO 14230-4 bus k

10. SAE-J1850 PWM protocol bus (-) (not SAE-1850 vpw) Europe, etc. Chrysler CCD bus (+)

14. Can low (ISO 15765-4 and SAE-J2284) 15. ISO 9141-2 and ISO 14230-4 Bus l line 16. Battery voltage

All pin definitions:

1. Manufacturer discretion. GM: j2411 gmlan/SWC/single-wire can. 2. SAE-J1850 PWM and SAE-1850 vpw bus (+)

3. Ford DCL (+) Argentina, Brazil (pre OBD-II) 1997-2000, USA, 4. Body Location 5. Signal Location

6. Can high (ISO 15765-4 and SAE-J2284) 7. ISO 9141-2 and ISO 14230-4 bus k 8.-9 .-

10. Bus negative line of SAE-J1850 PWM only (not SAE-1850 vpw) Europe, etc. Chrysler CCD bus (+)

11. Ford DCL (-) Argentina, Brazil (pre OBD-II) 1997-2000, USA, Europe, etc. Chrysler CCD bus (-) 12.-13.

14. Can low (ISO 15765-4 and SAE-J2284) 15. ISO 9141-2 and ISO 14230-4 Bus l line 16. Battery voltage

 

 

Standard OBD-II communication protocols are generally:
ISO 9141-2,
ISO 14230-4 (kwp2000) is one of them.
SAE j1850pwm,
SAE J1850 Vpm,
The ISO15765-4 (CAN-bus ).

 

Vehicle OBD Interface Definition