The modern automobile electronic devices due to the increasing, the connection line number also showed a trend of increase, in order to ensure the correctness and reliability of the wires, the wire connector has played a very important role. The wire connector is a connected with a wire harness socket, all sensing terminals using a special interface, control computer ECU and the external parts of all connections are via ECU connector, and the wiring harness in the signal switching also use wire connector. This can be considered, in automotive electronic control, control computer ECU is the control center, the wire harness is control system neural network, then, the wire connector is electric line beam relay station. However, the connector not only has the advantages of convenient installation, wiring accurately, in use also often fails, and the most common faults for the bad contact resulting in a" network" of signal transmission is interrupted, a direct impact on ringing control car good performance of the play. Wire and wire and connectors connector circuit breaker failure, probably due to the conductor broken in bad contact, connector, connector loosening caused by.

Because 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 ( earth) 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.

( 1) check the wire breaking first remove the control computer ECU and the sides of the transducer wire connector, and then measuring the resistance between the corresponding terminal of connector. Such as resistance less than 1 ohm, the line, for the next examination. In the measurement of the resistance of a wire, preferably in the vertical and horizontal two directions gently rocking wire to improve the measurement accuracy, at the same time, for the majority of the wire connector, multimeter table from the rear end of the connector is inserted into the rod, but for a waterproof jacket waterproof connector sheet bar cannot from the back end is inserted into the, because when the insertion a little carelessness will make terminal deformation.

( 2) short circuit resistance values are examined first to remove the control computer ECU and the sides of the transducer wire connector, and connector terminals on both sides of the measurement and the body resistance value.