In general, this means all 1996 model year cars and light trucks are compliant, even if built in late 1995. Two factors will show if your vehicle is definitely OBD II equipped:ġ) There will be an OBD II connector located under or around the dashboard, andĢ) There will be a note on a sticker or nameplate under the hood: "OBD II compliant". The connector must be located within three feet of the driver and must not require any tools to be revealed. While the parameters, or readings, required by OBD II regulations are uniform, the auto manufacturers had some latitude in the communications protocol they used to transmit those readings to scanners. ![]() Naturally, each felt they had the one true way, so we have three different OBD II communications protocols in use. What Communications Protocol does my vehicle use?Īs a rule of thumb, GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation). Chrysler products and all European and most Asian imports use ISO 9141 circuitry. ![]() ![]() Fords use SAE J1850 PWM (Pulse Width Modulation) communication patterns. On 1996 and later vehicles, you can tell which protocol is used by examining the OBD II connector: There are some variations among captive imports such as the Cadillac Catera, a German Opel derivative, which uses the European ISO 9141 protocol. J1850 VPW-The connector should have metallic contacts in pins 2, 4, 5, and 16, but not 10.
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