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I got a P0481 code where is the fan 2 control unit and the fan control 2 relay?

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  • Jonathan Cornejo
    Jonathan Cornejo Mar 27, 2011

    Thank for the information, but there are two black boxes with fan relays. One is the passenger side with three fan relays and one fog fan relay. In the driver's side just next to the fuse box is another black box with another three fan relays and one fog fan relay. How can I identify which one is the FAN CONTROL 2 RELAY? Thanks so much.

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The fan relays are located under the hood in the main fuse panel.look for a black box on the drivers or passengers side fender well. under the cover of the main fuse panel you will see locations of all relays,including the fan relays. thank you,for choosing fixya.com

Posted on Mar 27, 2011

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Posted on Jan 02, 2017

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2005 montana sv6 sitting in traffic temp gauge goes up codes P0128 and P0481 present


DTC P0128 Engine Coolant Temperature (ECT) Below Thermostat Regulations Temperature
An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.
The air flow coming into the engine is accumulated and used to determine if the vehicle has been driven within the conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not increase normally or does not reach the regulating temperature of the thermostat, the diagnostics that use ECT as enabling criteria may not run when expected.
If the PCM detects the calibrated amount of air flow and engine run time have been met, and the ECT has not met the minimum thermostat regulating temperature, DTC P0128 sets.

P0481
Cooling Fan Relay 2 Control Circuit
PCM
DTC P0480 or P0481

Have you changed the thermostat ?
Do you know how to test cooling fan relay (S)
Battery positive voltage is supplied to the cooling fan 1 relay from the COOL FAN #1 fuse. The powertrain control module (PCM) controls the cooling fan 1 relay by grounding the low speed cooling fan relay control circuit via an internal solid state device called a driver.
Battery positive voltage is supplied to the cooling fan 2 relay and the cooling fan 3 relay from the COOL FAN #2 fuse. The PCM controls the relays by grounding the high speed cooling fan relay control circuit.
When the PCM is commanding a relay on, the voltage potential of the control circuit should be low, near 0 volts. When the PCM is commanding the control circuit to a relay, the voltage potential of the circuit should be high, near battery voltage. If the fault detection circuit senses a voltage other than what is expected, the DTC will set.
The PCM will monitor the control circuit for the following conditions:
• A short to ground
• A short to voltage
• An open circuit
• An open relay coil
• An internally shorted or excessively low resistance relay coil
When the PCM detects any of the above conditions, the DTC will set and the affected driver will be disabled.

Jul 01, 2017 | Cars & Trucks

1 Answer

Service engine Soon light on. Code P0481 on Scanner. Both fans will come on without A/C compressor on so fans are working.


It sounds like you have a control problem , The ECM or PCM energize the relay by supplying a ground or power depending on the manufacturer ! What make , year model vehicle ! P0481 Cooling Fan 2 Control Circuit Malfunction

Mar 16, 2015 | Cars & Trucks

1 Answer

2003 CRYSLER 300 SM DTC # P0481 AND # P0340 ALSO # P0300...HELP


code P0481 high speed number 2 fan relay control circuit. check for faulty fan 2 relay blowed fuse. code P0340 no camshaft position sensor circuit failure.possible causes camshaft sensor has failed or crankshaft sensor failed both sensor work together to control fuel timing and ignition timing.PCM has failed many things will cause that code.check sensor wiring connector for shorts or damaged.

Aug 07, 2013 | 1995 Dodge Ram

1 Answer

Iwwhat is 481 code on a mazda


Hi there:
DTC P0481 - Cooling Fan 2 Ctrl CKT Malfunction
The P0481 requires reprogramming the PCM at a Mazda dealership, see below TSB in THIS LINK:



DESCRIPTION
Some vehicles may exhibit DTC P0481 (Cooling fan relays malfunction) stored in the PCM.

The false DTC detection occurs when the A/C refrigerant pressure switch is ON but the cooling fan relay is turned OFF by the PCM because the coolant temperature is 108C degrees and under. The PCM stores DTC P0481 because the cooling fan is operating without PCM control command. This is due to improper PCM calibration.



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Jun 22, 2012 | Mazda MPV Cars & Trucks

1 Answer

Fault codes


P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit
P0481 - Cooling Fan Relay 2 Control Circuit
It is not uncommon for the canister vent solenoid to go out.More then likely this is the correction for this issue.The second problem could be addressed by verifying that the second fan is not coming on and whether or not the fan is receiving any power.Turning the a/c on normally forces the second fan to come on.If it does not a wiring diagram may be necessary to check different points for power.Would start at the relay itself to verify power is going to and through the relay. You can also swap an identical relay with the fan relay just to test if the relay itself is malfunctioning.If it works after that then you need a replacement relay for that circuit.If it still does not work you will need to find out where the power stops flowing in that circuit.

Jun 05, 2010 | 2000 Chevrolet Impala

1 Answer

Is there a part number for the fan 2 circuit


no
that code says that the cooling fan 2 circuit has a failure, when it tried to turn it on the computer did not see a voltage change thus your code. Check the cooling fan 2 relay.

Aug 15, 2009 | 2003 Chevrolet Impala

1 Answer

PO481 code Chevy IMPALA 2003


Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/

P0481 Cooling Fan 2 Control Circuit Malfunction

Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf


Best of luck.
Greg

May 23, 2009 | 2003 Chevrolet Impala

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