Product characteristics: 1. Detects and diagnoses errors through the OBD connector link. 2. Monitors OBD interface voltage and ground, displays low voltage conditions, and shows diagnostic communication errors. 3. Allows access to OBD interface signals, including signal lines for vehicle decoders from various models. 4. Rapidly checks the OBD2 diagnostic connector for proper communication across all pins. 5. Preserves vehicle data when replacing the battery. By connecting the OBD2 device to the car and supplying auxiliary power to the control unit, ECU data is maintained during battery replacement. This OBDII Protocol Detector & Break Out Box is widely used in vehicle diagnostics, key programming, and ECU tuning. It enables real-time data monitoring while performing tests on a vehicle, allowing simultaneous test execution and process observation. Features: - Displays testing voltage on cars or trucks - Identifies active communication pin numbers - Acts as an extension for the OBD Diagnostic Link Connector - Facilitates pin short-circuit testing - Helps detect open or isolated circuit issues - Functions as a power extension for small DC testers requiring external power (up to 1.2 amps) - Enables circuit testing using a multimeter or oscilloscope - Verifies Power (Pin 16), Chassis Ground (Pin 4), and Signal Ground (Pin 5) - Prevents loss of ECU data during battery replacement Material: Plastic Color: As shown Package Contents: 1 x Test Box (B) Note: Other items not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.