News

The Elysee car, which runs about 76 thousand km. User response: the oil pressure warning lamp on the dashboard is not lighted when the ignition switch is turned on. Troubleshooting: (1) the cause analysis of the fault causes the oil pressure warning light on the dashboard when the ignition switch is connected. The possible reasons for the warning light are: 1) the contact contact in the oil pressure sensor is bad. 2) the light bulb of the oil pressure warning lamp is burnt out. 3) the circuit of the oil pressure warning lamp has a circuit breaker. (2) the troubleshooting method opens the hood of the engine, checks the connection of the related wiring harness, and does not find the abnormal. After pulling the plug of the oil pressure sensor and connecting the ignition switch, the voltage between the plug terminal and the bypass is measured by the DC voltmeter, as the battery voltage, indicating that the line of the oil pressure warning lamp is connected well. The fault is in the oil pressure sensor. When the oil pressure sensor is changed, when the ignition switch is switched on, the oil pressure warning lamp can light up and the engine start lamp can be extinguished. However, not long after the failure of the oil pressure warning lamp appeared again, it is still normal to measure the voltage of the sensor terminal with a voltmeter. Is the oil pressure sensor broken again? Then check the plug carefully and find some damage, when it is inserted back to the sensor, it feels not too close, the oil pressure sensor plug is plugged by hand, the oil pressure warning lamp on the dashboard is not bright when the oil pressure warning lamp is on. The reason is that the plug can not be plugged into the circuit, causing circuit breakage. (3) the fault treatment measures repair the plug of the oil pressure sensor to make it connect well with the sensor socket. When the ignition switch is connected, the oil pressure warning lamp can be lit, and the lamp can be extinguished after the engine starts, and the fault is eliminated. Fault analysis: the oil pressure sensor plug may not be noticed by the mechanical damage in the previous maintenance of the engine, resulting in the poor connection of the oil pressure sensor connector. When the first overhaul, it was mistaken for the fault of the oil pressure sensor. After the sensor was replaced, the circuit was connected when the plug was reinserted, so the oil pressure warning lamp was bright, but the circuit breaker was broken after the car was bumped and vibrated because of the mechanical damage of the oil pressure sensor connector. The fault will be reproduced.