Docked Wage

Here's what I've got:

Single 2850 CFM fan
One Speed Fan (only 2 wires come out of the motor)

PCM Programed as follows:

Fan 1 and Fan 2 are set the same.
Both on at 195 F and both off at 185 F.
If temp is over 225 F both will run for 2 min after shutdown.

Fan relay is triggered by the PCM on the pin for Fan 1 and functions perfectly. The fan comes on at 195 F on my gauge and on a 90 degree day the Jeep runs all day at 210 F or less with no problem.

My issue is that I'm getting a Check Engine Light (CEL) and the fault code P0481 for Fan Circuit 2 Fault.

I assume the fault is being tripped because my Fan 2 wire goes nowhere.

I think I need to put a relay (that controls nothing) between the Fan 2 wire and a 12 + source so the PCM "sees" the relay coil load.

Has anyone run into this issue and solved it this way before?

Docked Wage

I might add that changing the PCM settings is the easiest way to fix this issue but the guy that did the programing on my ECM has not returned my calls.

G-Body

iTrader: (4)

Yeah you could put a relay in there or even just a resistor and it should stop the check engine light.

The bosch relays generally have a 75 ohm coil, but I believe I used a resistor with a 400 ohm coil and I don`t have a check engine light, so if you wire a resistor thats between 75 and 400 ohms in it would do the trick.

Pocket

iTrader: (22)

Or just turn it off

Im running a single fan from the PCM with no codes

Docked Wage

See post #2. The guy that programmed the PCM is not returning calls.

Docked Wage

I ended up putting in a relay that controls nothing. The code went away and all is well.

chrisfrost

iTrader: (8)

That second fan is normally for the a/c condensor so if You have a/c or plan to get a/c You would use fan2 or actually both fans when a/c is on .