Definition of automobile sensor wiring

1.ABS sensor is a wheel speed sensor, which is used to detect the wheel speed. It is actually an electromagnetic coil with 2-wire system.

2. The throttle position sensor has 3 wires and 4 wires; Inside the third wire is a sliding rheostat, and inside the fourth wire there is a pair of idle contacts besides a sliding rheostat.

3. Generally, the intake pressure sensor is made of three wires, two of which form a power supply circuit, and the other one is a signal wire.

4. Generally, air temperature sensor has a two-wire system, one for power supply and the other for signal line.

5. Coolant temperature sensors are 2-wire, 3-wire and 4-wire. 2-wire system, one power supply, and the other signal wire is connected to ECU；; 3-wire system, one power supply, one signal wire connected to ECU, and one water thermometer connected to instrument panel with signal wire; 4-wire system, two of which are connected to ECU, and the other two are connected to the water thermometer on the dashboard.

6. Crankshaft speed position sensor, including magnetoelectric sensor and Hall sensor. Magnetoelectric has two-wire system and three-wire system, and both wires of the two-wire system are signal wires connected to ECU；; Two of the 3-wire system are signal wires, and the other one is signal shielding wire. Hall type is a 3-wire system, two of which form a power supply circuit, and there is also a new signal wire.

7. Camshaft phase sensor and crankshaft speed position sensor are the same, including magnetoelectric and Hall sensor.

8. Knock sensors are made of single wire, 2 wire and 3 wire. The single-wire system is that a signal wire is connected to ECU and the ground wire is grounded; One of the 2-wire system is a signal wire connected to ECU, and the other is a ground wire also connected to ECU; One of the 3-wire system is a signal wire connected to ECU, one is a ground wire also connected to ECU, and the other is a signal shielding wire.

9. There are single-wire, 2-wire, 3-wire and 4-wire oxygen sensors. In the single-wire system, only one wire is a signal wire, which is connected to ECU；; One of the 2-wire system is a signal wire connected to ECU, and the other is a ground wire also connected to ECU; One of the 3-wire system is a signal wire connected to the ECU, and the other two are power supply lines for the heating coil of the oxygen sensor, one is connected to the EFI relay and the other is connected to the ECU; The 4-wire system has a signal wire connected to ECU, a ground wire connected to ECU, a heating coil power supply wire connected to EFI relay, and a heating coil control wire connected to ECU.