1.Euro III vehicle
Normally diesel vehicle is 24 V battery voltage. So here take 24V as an example, make a brief introduction about pin definition of Euro III and Euro IV vehicle engine diagnostic socket.
This vehicles usually adopts KWP2000 communication protocol, diagnostic socket is usually 4-pin.Convertion is ground wire, fire wire, K line 1,kK line 2.Use high resistance type digital multimeter under the condition of ignition key on.
(Here will not introduce how to use multimeter),measure the voltage of 4 pins respectively, normally ground wire 0V,fire wire 24V,2 K lines are about 22V(little lower than voltage of fire wire).
Now connect one end of main testing cable to auto diagnostic scanner, another end DB15 connect to jumper box. Select the correct jumper according to pin on vehicle, connect ground wire on vehicle to GND on jumper box, fire wire to VCC. 2 K line connect to 7# and 15# jack respectively. Now Power light on jumper box will be seen on, and then select the correct vehicle model menu in auto scanner to enter. If still unable to test, you can contact Overseas Dept. of our company for assisting test.
2.Euro IV model
This model usually adotps CAN communication protocol (Not excluding some Euro IV vehicles that still adopts Euro III standard, Such as FUSO) Diagnostic socket is normally 4 pins: ground wire, fire wire, CAN_H, CAN_L, voltage measured is: 0V, 24V, 2.5+V, 2.5-V.The pin that little higher than 2.5V http://www.fcar.com/auto-diagnostic-scanner/1-f3-w-world-cars.html |