The fault of wires and terminals may also be caused by the short circuit between the harness and the vehicle body (ground wire) or inside the relevant switch. Before inspection, first check whether the terminals on the vehicle body are firmly fixed, and then test according to the following steps.

1. Check the wire for continuity

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

2. Resistance value check of short circuit

First remove the wiring terminals on both sides of the control computer ECU and the sensor, and then measure the resistance between the terminal blocks of the connectors on both sides and the body. During measurement, one end of the meter bar is grounded to the vehicle body, and the other end shall be measured on the wire connectors on both sides respectively. If the resistance value is greater than 1 ohm, it indicates that there is no short circuit between the wire and the vehicle body.

3. Terminal appearance and contact pressure inspection

First, remove each terminal one by one, check whether there is rust and dirt on the connector terminal, and clean the rust and dirt. Then check whether the terminal strip is loose or damaged, whether the terminal is firmly fixed, and whether the terminal is loose when gently pulled. Conversely, if the plug terminal in which seat hole is easier to pull out than other seat holes, the seat hole may cause the fault of poor contact in use.

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