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Author Topic: ODB protocal  (Read 1364 times)
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pico
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« on: March 18, 2008, 09:10:47 09:10 »

who can help me for PWM and VPW timming diagram.
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alspa
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« Reply #1 on: May 14, 2008, 07:37:29 07:37 »

Pico,

The OBD2 standard allows for multiple electrical interfaces, which complicates the hardware used to interface with the vehicle. Equipment and Tool Institute has a nice interface by manufacturer page. Scantool.net also has a nice page listing vehicles and OBD2 protocols, and another describing a method of determining interface by connector pin layout.

Here is a brief summary of the most popular electrical interfaces:

ISO15765 (CAN) - Controller Area Network, a new higher speed interface, just now being implemented
ISO9141-2 used mostly by Chrysler and the European/Asian imports
ISO14230, or KWP2000 (Keyword Protocol) shares the electrical portion of ISO9141 standard, but defines it's own commands.
PWM J1850-41.6 (41.6Khz Pulse Width Modulated) used mostly by Ford
VPW J1850-10.4 (10.4Khz Variable Pulse Width) used mostly by GM vehicles

Here is a description o fthe SAE J1850 standard

http://www.interfacebus.com/Automotive_SAE_J1850_Bus.html

Cheers,
Alspa

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