How to detect the short circuit fault of the Terminal

The failure of wires and Terminal Block Connector may also be caused by a short circuit between the wiring harness and the vehicle body (ground wire) or inside the relevant switch. Before the inspection, you should first check whether the terminals on the body are firmly fixed, and then you can perform the test according to the following steps.

1. Check whether the wires are on or off

First remove the connecting terminals on both sides of the control computer ECU and the sensor, and then measure the resistance between the corresponding terminals of the terminals. If the resistance value is not greater than 1 ohm, the wire is normal for the next inspection. When measuring wire resistance, it is best to gently shake the wire in the vertical and horizontal directions to improve the accuracy of the measurement. At the same time, note that for most wire terminals and multimeter rods, they should be inserted from the back of the connector. The waterproof terminal bar of the waterproof jacket cannot be inserted from the rear end, because the terminal will be deformed if it is inserted carelessly.

Wire Terminals

2. Check the resistance value of short circuit

First, remove the Wire Terminals on both sides of the control computer ECU and the sensor, and then measure the resistance between each terminal block of the connectors on both sides and the body. When measuring, one end of the meter rod is grounded to the body, and the other end should be measured on the wire connectors on both sides. If the resistance value is greater than 1 ohm, it means that there is no short circuit between the wire and the body.

3. Inspection of terminal appearance and contact pressure

First, remove each terminal one by one, check whether there is rusty touch and dirt on the Connector Terminal, and clean up the rust and dirt. Then check whether the terminal strip is loose or damaged, whether the terminal is fixed firmly, and the terminal should not be loose when pulled slightly. Conversely, if the plug terminal in which socket hole is easier to pull out than other socket holes, the socket hole may cause poor contact failure during use.