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Where is the cooling fan speed sensor on my 2002 trailblazer?

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Hi.
The cooling fan speed sensor is built in inside the 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. Here an interesting website on trailblazer fan system.
Regards.

Posted on Oct 03, 2009

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Posted on Jan 02, 2017

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SOURCE: is your 2002 trailblazer speed sensor located

Hi!!

The speed sensor is located on top or the transmission, towards the back end.

Don't forget to rate this post!!

Posted on Jul 23, 2010

  • 436 Answers

SOURCE: where is the cooling fan

if by cooling you mean heater or ac system fan then it is behind glove box near the blower motor. depending on the type of heating system you have it could have 6 wires for manual heating or 3 wires for automatic heating

Posted on Oct 03, 2009

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2006 Chevrolet Trailblazer I6 suddenly began overheating at idle. Parts replaced within the last 2 months: Fan clutch, Tstat, radiator, radiator cap


How about the water pump ? Who replaced the parts ? A qualified repair shop ? Were codes checked ?
The PCM controls the electro-viscous fan clutch engagement. The PCM regulates a 12-volt pulse width modulated signal (PWM) to the cooling fan relay. The PWM signal determines the ON time of the relay. As the commanded state of the fan clutch increases, so does the ON time of the relay. This ON time directly effects the amount of time the solenoid, which is internal to the fan clutch, is energized. When the solenoid in the fan clutch is energized, it opens the spring loaded valve and allows fluid to flow from the storage chamber to the fluid coupling of the cooling fan clutch, increasing the fan speed. When the solenoid is de-energized, the spring loaded valve closes, and blocks the path of the fluid to the fluid coupling of the fan clutch, reducing fan speed.
The fan has the ability to create a feedback signal, so the PCM has an actual fan speed input. This is done with a hall effect sensor internal to the fan clutch. The PCM supplies a 5-volt reference and a low reference to the hall effect sensor. The hall effect sensor returns a signal pulse through the cooling fan speed signal circuit in response to the relucktor track passing by the magnetic field of the hall effect sensor.
Was electrical tested before fan clutch was replaced !

Sep 29, 2016 | 2006 Chevrolet Trailblazer

1 Answer

2002 CHEVY TRAILBLAZER keeps setting a FAN Speed Sensor Code.


CJ, this is very common for the I6 engines in TB's and Envoys. You need a new fan clutch. Triple check the wire connectors first, located on the top of the radiator on the drivers side, make sure those are in tact first. Then replace the fan clutch. Might as well do your water pump and serpentine belt while you're in there.

Jul 08, 2015 | 2002 Chevrolet TrailBlazer

1 Answer

2003 chevrolet trailblazer 4.2 problem code p1481


See attached picture for location of temp. sensor, but that code has nothing to do with temp sensor. The speed of the fan does not agree with the commanded speed, you may have another bad fan clutch.




10_5_2012_11_54_58_pm.jpg

Oct 04, 2012 | 2002 Chevrolet TrailBlazer

1 Answer

I have a 02 trailblazer that service engine light came on code for high speed fan came up now truck has a lot better pick up when you push the gas


the fan control module has the fan stuck on high speed. the reason for the extra power is because the ECM is adding fuel to the injectors due to the engine running cooler than normal.may want to get the cooling fan replaced it comes with a new control module.

Aug 08, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

2002 trailblazer 4wheel - scan code p1484/p1481. Spent days researching these 2 codes on many web sites and forums> cooling fan speed signal lost only sometimes mostly in city not freeway. The car is...


Sounds like the fan clutch is going bad, these had a reputation for failing. The fan clutch is controlled by the computer and if the fan speed does not match what the computer has set, an error code is set. A fan clutch costs in the area of $120 - $200, and the labor to replace it is probably another equal amount.

Jul 07, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

What is a fan speed high code 0495 on a 2002 trail blazer


The cooling fan on the engine has sensor that might mean that the fan is going faster than normal. Try resetting the main computer by disconnecting the car battery for about 35 seconds. Reconnect the battery. If the code comes back, there may be a problem with the fan. Try replacing it. Remember that when you disconnect the battery, you will loose settings on the clock and radio. Hope this works for you.

Oct 15, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Is your 2002 trailblazer speed sensor located


Hi!!

The speed sensor is located on top or the transmission, towards the back end.

Don't forget to rate this post!!

Jul 23, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

2003 Trailblazer L6 running very sluggish. The only code the ECU is throwing is a P1481 code which upon some quick searches is the fan clutch. That shouldnt have anything to do with the poor performance...


Code P1481 - Cooling Fan Speed Sensor Circuit

Several owners repair this sensor and connections, but the problem come on again; I suggest replace the sensor; this is built into the fan clutch.

Hope helps.

Jul 09, 2010 | 2003 Chevrolet TrailBlazer

2 Answers

Code 1481 and1271


your code P1481 is for the cooling fan speed the problem is often the wires and connector that go to that unit ... removing and replugging the connector sometimes fixes it ... also check the fan clutch and fan (not as often the trouble) .. there is a techniical bulliten out for this trouble .. (tsb050605012) .. sometimes the wire harness is replaced for the fan ...

your trouble code p1271 is associated with the accelerator pedal position sensor (APP) (right above the gas pedal) .. again check the wiring and connector going to the APP .. if the APP turns out to be bad then its not hard to change and requires no computer changes ... when you get an APP alarm then your car may go into a "reduced speed mode" ...
here is a list of the service bullitins on your trailblazer....

http://www.carcomplaints.com/Chevrolet/Trailblazer/2002/tsbs.shtml

Apr 15, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Where is the cooling fan speed sensor on my 2002 trailblazer?


if by cooling you mean heater or ac system fan then it is behind glove box near the blower motor. depending on the type of heating system you have it could have 6 wires for manual heating or 3 wires for automatic heating

Oct 03, 2009 | 2005 Ford Explorer

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