1. Check the continuity of the wire
First, remove the 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 more than 1 ohm, the wire is normal, so that the next step can be checked. When measuring wire resistance, it is best to shake the wire slightly in both vertical and horizontal directions to improve the accuracy of the measurement. The waterproof terminal bar of the waterproof cover cannot be inserted from the rear end, because the terminal will be deformed if inserted carelessly.

2. Check the resistance value of the 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 watch rod is grounded to the body, and the other end should be measured on the wire connectors on both sides respectively. If the resistance value is greater than 1 ohm, it means that the wire and the body have no short-circuit fault.

3. Terminal appearance and contact pressure inspection
First, remove each terminal one by one, check whether there is rust and dirt on the connector terminals, and clean the rust and dirt.
Then check whether the terminal piece is loose or damaged, whether the terminal is firmly fixed, and there should be no looseness when pulling gently. 
Conversely, if the plug terminal in one of the socket holes is easier to pull out than the other socket holes, the socket hole may cause a failure of poor contact in use.