English abbreviation for Land Cruiser fuel pump relay?
1 Answers
The English abbreviation for the Land Cruiser fuel pump relay is PMR, which stands for Pump-Motor-Relay. The fuel pump relay controls the power supply to the fuel pump. In modern vehicles, which are generally direct-injection or electronic fuel injection, the relay disconnects the fuel pump once the fuel supply meets certain requirements, thereby controlling the fuel pump's operation. More details are as follows: 1. Relay location: The fuel pump relay is usually located in the fuse box in the engine compartment. If not found there, check the fuse box in the driver's compartment. The cover of the box is labeled, making it easy to identify the fuel pump relay. Once located, remove the relay. The terminals below are connected to four wires, with two thinner wires serving as control wires (controlling the fuel pump operation). Of these two thin wires, one connects to the engine ECU, while the other is either a power or ground wire (different vehicles may have different configurations—some ECUs use high potential, others low potential). 2. Relay switching principle: A relay functions both as a control switch and as the controlled object (actuator). Taking the fuel pump relay as an example, it acts as the control switch for the fuel pump. However, the relay coil only forms a circuit when the driving transistor in the ECU is turned on, completing the path through the ECU's ground connection.
