P1481 Cooling Fan Speed Sensor

Here an interesting website on trailblazer fan system.

P1481 cooling fan speed sensor.

Dtc p1481 will set if the engine is started without the drive belt on. 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. P1481 gmc 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.

The cooling fan speed signal circuit. The low reference circuit. Tests that the pcm receives a cooling fan speed signal through the cooling fan speed signal circuit. The numbers below refer to the step numbers on the diagnostic table.

P1481 gmc description the engine cooling fan is a variable speed fan. 8 people found this helpful. Its the cooling fan speed sensor that needs to be replaced. Check that wiring has continuity the wire to sensor must have 5v.

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. 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.