Topdiag BT400 is 4-in-1 multi-function circuit/battery tester：
1.Battery replacement：Protect the memory of the vehicle ECU when replacing the battery.
2.OBD2 Port Pin Voltage Test：Test OBD2 interface can work well.
3.Circuit Leakage Test:Test the vehicle circuit for leakage.
4.Battery Test:Cranking Test/Charging Test/Battery Data and health assessment.
Note：Please make sure the car is dormant，The device can save the data of leakage current for 30 minutes, and view the results through "playback waveform".
Topdiag BT400 Support Battery test：
choose“ BAT Test ” Function，Then press OK to enter, there are CCA、JIS、 GB、SAE、MCA、 CA、DIN、IEC、 EN、BCI and other difffferent test standards.
Topdiag BT400 Support Replace Battery：
Prepare an extra spare vehicle battery , Connect the device to the spare battery correctly with red clip to positive black clip to negative pole, Plug OBD2 adapter to the Data Link Connector socket in the Vehicle.Selecte the “ Replace battery ” function, Press OK key to enter, and follow the steps as displayed to continue .
Topdiag BT400 Support OBD2 port pin test：
OBD-PIN ”Function,Press the OK key to enter, and you can view the voltage value of each pin of OBD2 Connector.