About obd2

All cars built since January 1, 1996 obd2 havesystems. Manufacturers started incorporating obd2 in various models as early as 1994. Some early obd2 cars were not 100% compliant. to see the dates obd2  started being included on specific makes and models.

There are five basic obd2 protocols in use, each with minor variations on the communication pattern between the on-board diagnostic computer and the scanner console or tool. 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 or KWP2000. GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation), and Fords use SAE J1850 PWM (Pulse Width Modulation) communication patterns。 to see which cars use each system. CAN is the newest protocol added to the obd2 specification, and it is mandated for all 2008 and newer model years.

You may also tell which protocol is used on a specific automobile by examining the connector socket carefully. 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 or KWP2000. If no pin is present in the #7 position, the car uses an SAE protocol. If there are pins in positions #7 and #2 and/or #10, the car may use the ISO protocol. The CAN protocol uses pins #6 and #14.

While there are obd2 electrical connection protocols, the command set is fixed according to the SAE J1979 standard.

All cars built since January 1, 1996 have systems. Manufacturers started incorporating obd2 in various models as early as 1994. Some early obd2 cars were not 100% compliant. to see the dates obd2 started being included on specific makes and models.

There are five basic protocols in use, each with minor variations on the communication pattern between the on-board diagnostic computer and the scanner console or tool. 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 or KWP2000. GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation), and Fords use SAE J1850 PWM (Pulse Width Modulation) communication patterns。 to see which cars use each system. CAN is the newest protocol added to the specification, and it is mandated for all 2008 and newer model years.