Which protocol is based on an OBD-II compliant vehicle?

    Yesterday, I'm requested "I want to be aware of protocol from the OBD2 plugFiat Ducato 2.3 JTD 10/2006 year. Appreciate the solution." And That I send him an in depth explanation the following.

 

All 1996 and more recent automobiles (cars and lightweight trucks) offered within the U . s . States should be OBD-II compliant. And Also The Eu OBD legislation is sort of more difficult.

 

An OBD-II compliant vehicle may use the five communication methods: J1850 PWM, J1850 VPW, ISO9141-2, ISO14230-4 (also called Keyword Protocol 2000), and much more lately, ISO15765-4/SAE J2480 (a "flavor" of CAN). US vehicle producers weren't permitted to make use of CAN until model year 2003, but by model year 2008 on and on forward, all automobiles uses the CAN protocol.

 

You will find two kinds of diagnostic link fittings (DLCs) based on SAE J1962 - Type A and kind B, proven in Figures 2 and three, correspondingly. The primary difference forwards and backwards fittings is the same shape as the alignment tab.

 

Location - Based on J1962, Type A DLC "shall be situated within the passenger or driver's compartment in the region bounded through the driver's finish from the instrument panel to 300 mm (~1 foot) past the vehicle centerline, connected to the instrument panel and easily accessible in the driver's chair. The most well-liked location is between your steering column and also the vehicle centerline"

 

Fig. 1 - J1962 Vehicle Connector, Type A

Type B DLC "shall be situated within the passenger or driver's compartment in the region bounded through the driver's finish from the instrument panel, such as the outside as well as an imagined line 750 mm (~2.5 foot) past the vehicle centerline. It will be connected to the instrument panel and easily accessible in the driver's chair or in the Co-motorists chair or in the outdoors. The automobile connector will be mounted to facilitate mating and unmating."

Fig. 2 - J1962 Vehicle Connector, Type B

Typically, you are able to pick which protocol your automobile is applying by searching in the pinout from the DLC:

 

* More recent automobiles which use the ISO9141-2 or ISO14230-4 methods is optional with Pin 15 (also known as the "L-line")

 

Besides hooks 2, 7, 10, and 15, the connector must have hooks 4 (Chassis Ground), 5 (Signal Ground), and 16

(Battery Positive). Which means that:

PWM The connector should have hooks 2, 4, 5, 10, and 16

VPW The connector should have hooks 2, 4, 5, and 16, although not 10.

ISO The connector should have hooks 4, 5, 7, and 16. Pin 15 might show up.

CAN The connector should have hooks 4, 5, 6, 14, and 16