The wire in the middle disconnection fault is very rare, mostly on the connector is disconnected, therefore, inspection should focus on careful examination of sensor and is connected with the wire at, whether there is loose and poor contact. By caused by poor contact connector circuit fault, often due to external connector end rust, dirt into the terminal or connection socket, thereby causing the contact pressure drop. This time, as long as the connector is removed, then is inserted, to change the connection condition, restore normal contact. Wire and wire and connectors connector fault fault may also be due to harness and body or between the relevant switch internal short circuit caused by. Before the examination should first look at the body of the wire connector fixing is reliable, and can be conducted according to the following procedure test.