![]() If there are pins in positions #7 and #2 and/or #10, the car may use the ISO protocol. If no pin is present in the #7 position, the car uses an SAE protocol. If the dash connector has a pin in the #7 position and no pin at #2 or #10, then the car has the ISO 9141 protocol. You may also tell which protocol is used on a specific automobile by examining the connector socket carefully. GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation), and Fords use SAE J1850 PWM (Pulse Width Modulation) communication patterns. While there have been some manufacturer changes between protocols in the past few years, as a rule of thumb, Chrysler products and all European and most Asian imports use ISO 9141 circuitry. ![]() There are three basic OBD-II protocols in use, each with minor variations on the communication pattern between the on-board diagnostic computer and the scanner console or tool. Some early OBD-II cars were not 100% compliant. Manufacturers started incorporating OBD-II in various models as early as 1994. ![]() All cars built since Januhave OBD-II systems. ![]()
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