Pin Detection

📖 YOUCANIC Automotive Glossary

Pin Detection is a diagnostic feature that identifies which pins on the OBD2 DLC connector have active electrical signals, helping determine which communication protocols the vehicle uses. The OBD2 connector has 16 pins, but not all are used on every vehicle — the active pins indicate which protocols are available: pins 6 and 14 active means CAN Bus, pin 7 active means ISO K-Line, pin 2 active means J1850 PWM or VPW, and pin 10 active alongside pin 2 means J1850 PWM specifically. Pin 16 should always show 12V+ (power) and pins 4/5 should show ground.

Pin Detection is useful when your scanner has difficulty connecting to a vehicle — checking which pins are active helps verify the vehicle’s protocol and confirm the DLC connector has proper power, ground, and data signals. If expected protocol pins show no signal, it may indicate a CAN Bus wiring fault, a blown OBD2 fuse, or a damaged connector. The YOUCANIC UCAN-II can identify active protocols during connection, but DIYers can also manually check pin voltages with a multimeter for basic troubleshooting.