Common faults of water temperature meter:
When the ignition switch is turned on, the pointer of the water temperature gauge always indicates that it does not move above 100 ℃, and the pointer does not move when the water temperature changes. .
cause of issue:
The power cord is broken; the electric heating coil of the meter is broken; the electric heating coil of the water temperature sensor is broken, the wiring screw is loose, the wire of the meter is broken, the internal short circuit, the water temperature sensor is invalid;
Method of exclusion:
1. Check the ammeter (the breaker contact must be closed), if the ammeter indicates 0. It indicates that a section of the common circuit of the battery to the ignition switch power supply terminal is open; if the ammeter shows that the discharge is about 5 A, it means that the common circuit is energized, and the section of the line from the ignition switch II terminal to the water temperature meter and sensor is open. You can use a water thermometer to enter the fire terminal to test the fire.
2. Use the middle of the screwdriver to close the water temperature meter into the fire terminal, make the tip of the screwdriver touch the metal part of the machine. If there is no spark, it means the connection between the ignition switch and the water temperature meter is broken If a spark appears during the ground test, use a screwdriver to ground the terminal of the water temperature sensor. If the pointer of the water temperature gauge quickly turns to the position of 40 ℃, it proves that the water temperature sensor is damaged.
3. The pointer of the water temperature gauge always refers to the fault at 40 ℃. Turning off the ignition switch, the pointer of the water temperature gauge will quickly turn from the position above 100 ℃ to 40 ℃. After the engine temperature rises, the pointer of the water temperature gauge is still at 40 ℃, indicating that the circuit from the water temperature gauge to the water temperature sensor is faulty. The wiring of the water temperature sensor can be dismantled for an open circuit test. If the pointer of the water temperature meter turns back to the position above 100 ℃, it proves that the water temperature sensor is grounded.
