How many wires are there in the automobile sensor?

1.ABS sensor is a wheel speed sensor, which is used to detect wheel speed. It is actually a two-wire electromagnetic coil.

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

3. The intake pressure sensor is generally composed of three wires, two of which constitute the power supply circuit and the other is the signal wire.

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

5. The coolant temperature sensor has 2 wires, 3 wires and 4 wires. 2-wire system, with one power supply and the other signal wire connected to ECU；; Three-wire system, one power supply, one signal line connected to ECU, and one water thermometer connected to instrument panel by signal line; 4-wire system, two of which are connected to ECU, and the other two are connected to the water thermometer on the instrument panel.

6. Crankshaft speed position sensor, including magnetoelectric sensor and Hall sensor. Magnetoelectricity has two-wire system and three-wire system, and both wires of the two-wire system are signal wires connected to ECU; ; In the 3-wire system, two are signal wires and the other is signal shielding wire. Hall type is a 3-wire system, with two power supply loops and a new signal wire.

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

8. The knock sensor is made of single wire, double wire and three wire. The single-wire system is that the signal wire is connected to ECU and the grounding wire is grounded; One of the two-wire systems is a signal wire connected to the ECU, and the other is a ground wire also connected to the ECU; One of the 3-wire systems is a signal wire connected to the ECU, one is a grounding wire also connected to the ECU, and the other is a signal shielding wire.

9. There are single-wire, double-wire, three-wire and four-wire oxygen sensors. In the single-wire system, only one wire is a signal wire, which is connected to the ECU；; One of the two-wire systems is a signal wire connected to the ECU, and the other is a ground wire also connected to the ECU; One of the 3-wire system is a signal wire connected to the ECU, the other two are power supply wires 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 line connected to the ECU, a ground line connected to the ECU, a heating coil power line connected to the EFI relay, and a heating coil control line connected to the ECU.

The number of sensor wires of different models is different,