Car Circuit Detection Pen Function:
1. Check if the fuse is blown
2. Positive and negative power supply detection
3. Detect the LAN circuit
4. Automotive circuit voltage detection
5. Detect short circuit faults
6. Distinguish between real power, virtual power, series power and poor grounding
7. Awl function
8. Lighting function of back light of probe pen
9. Detect vehicle speed sensor
10. ABS circuit detection
11. Detect the idle speed circuit, ignition circuit
12. Injection circuit and exhaust gas recirculation circuit
