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J1850 VPW interface exist in General Motors and Chrysler vehicles, J1850 PWM exists in Ford models to 2003 with EEC-V system, Ford Cougar (all UK models), Ford Puma, Ford Fiesta Zetec (models to 2003), Ford Mondeo Zetec (models to 2003), Ford Focus (models to 2003), newer Jaguar S-Type and Jaguar X-Type and pre 2004 Mazdas vehicles.

SAE J1850 PWM (pulse-width modulation — 41.6 kbit/s, standard of the Ford Motor Company)

  • pin 2: Bus+
  • pin 10: Bus–
  • High voltage is +5 V
  • Message length is restricted to 12 bytes, including CRC
  • Employs a multi-master arbitration scheme called 'Carrier Sense Multiple Access with Non-Destructive Arbitration' (CSMA/NDA)

SAE J1850 VPW (variable pulse width — 10.4 kbit/s, standard of General Motors)

  • pin 2: Bus+
  • Bus idles low
  • High voltage is +7 V
  • Decision point is +3.5 V
  • Message length is restricted to 12 bytes, including CRC
  • Employs CSMA/NDA

RS-232 to J1850 PWM cableOBD II J1850 PWM to RS-232 interface cable schematic by ScanTool.net

 

 

RS-232 to J1850 VPW cable

 

 

 

 

OBD II J1850 VPW to RS-232 interface cable schematic

 

See also PC RS232 interface details.

 

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