The diagnostic port or diagnostic connector provides a standardized connection point for device diagnostic connections. Also referred to as a On-Board Diagnostics (OBD) connector. A diagnostic tool attached to the connector will check for engine or other system malfunction.
The procedure to connect your vehicle to a diagnostic tool is simple. Your vehicle's diagnostics harness is often connected to the vehicle's diagnostic connector. The connector is a standard size and has a 16-pin male plug (male on the ground side) with a standard 16-pin female receptacle (female on the ground side).
Listed below are various diagnostic cables and connectors. When replacing a defective cable, ensure that the new cable you purchase matches the connector type of the original cable. To determine the connector type of your original cable, refer to the following diagram:. OBD II diagnostic connector Pin function 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Diagnostic connector Pin function 1 Female connector Pin function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Diagnostic connector Pin function 1.5 Male connector Pin function. The most common diagnostic port is the 16-pin male socket of the OBD-II connector. The OBD-II connector is a standard-sized connector that you can find on most vehicles today.
The diagnostic connector is standard on all makes and models and generally includes the following:. Vehicle diagnostic port/connector. It has a 16-pin male plug (female on the ground side). When you connect a wire harness to the vehicle, you must make sure that you are connecting it to the correct connector. For example, an alarm warning light will be wired to the OBD-II connector.
For detailed information on how to make OBD connections, refer to the following diagnostic connector diagram:. 8 pin and 6 pin diagnostic connectors. The 6 pin diagnostic connector is often found on an older vehicle and is connected to the OBD-I connector. For more information on the OBD-I connector, refer to the following diagram:. OBD-I connector. The 6 pin diagnostic connector is often found on an older vehicle and is connected to the OBD-I connector. For more information on the OBD-I connector, refer to the following diagram:.
8-pin diagnostic connector. The 8-pin diagnostic connector is often found on a vehicle with a newer transmission and includes the following functions:. Transmission failure codes. The 8-pin diagnostic connector has three red plug-in points: the forward plug, the reverse plug and the neutral plug. The forward plug usually provides the only functions that are available on a vehicle with a conventional transmission and on vehicles with a manual transmission. The forward plug can be used to detect the failure of the transmission control valve. This function provides the Transmission fluid pressure and whether the clutch is disengaged or not.