P1481 Cooling Fan Speed Sensor

Here an interesting website on trailblazer fan system.

P1481 cooling fan speed sensor.

P1481 gmc meaning the engine cooling fan is a variable speed fan. The cooling fan speed sensor is built in inside the fan clutch. The low reference circuit. The engine control module controls the fan speed by sending a pulse width modulated signal to the cooling fan speed control module the cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the pulse width modulated signal.

8 people found this helpful. The engine control module controls the fan speed by sending a pulse width modulated signal to the cooling fan speed control module the cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the pulse width modulated signal. I got check engine light on and poped code p1481 fan speed circuit sensor does that mean that i have a bad fan clutch since mine is an electronic fan clutch. If you have a code p1481 or similar pointing at the cooling fan speed sensor often you have to fix or replace the wiring rather that the sensor.

Check that wiring has continuity the wire to sensor must have 5v. The cooling fan speed signal circuit. Its the cooling fan speed sensor that needs to be replaced. P1481 gmc description the engine cooling fan is a variable speed fan.

P1481 meaning the engine cooling fan is a variable speed fan. The engine control module controls the fan speed by sending a pulse width modulated signal to the cooling fan speed control module the cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the pulse width modulated signal.