bczee

iTrader: (12)

Getting a DTC P0481 Cooling fan 2 control circuit on my Nova, it has a 2002 LS1 w/4L60e. I did the wiring on the harness and don't seen any issue. I just recently got the Nova running. I had this code and another one for the O2 on bank #1 being slow response. I switch that one out for spare and so far that code has not come back.

So.. just need some assistance with the P0481... I had Mark Romans do a Bench tune to get me up and running. Planning on getting together with him soon for a Dyno Tune.

I checked my wiring from the PCM connector to activate both Fans (#1 and #2) by grounding the signal wires to activate the relays. .so.. the wiring of the relays and fan are ok.

I did some of the normal research on the code, but didn't really find anything to help me resolve it.

Does this code need to be adjusted in the PCM programing and setup within the PCM tune ? If so. .I will have to live with it until I get fixed in the Tune ?

But if anyone has any suggestion for now.. or any question on my setup.

thanks

BC

ls1nova71

iTrader: (4)

I just did a quick run down of the flow chart in the GM service manual, and since grounding the PCM connector side of the wiring turns the fans on, the wiring seems like it should be good. From the diagnostic aids sounds like it might be a bad connection at either the PCM connector or at the relays themselves. I would check the connections, clear the codes and see if it comes back.

6speediroc

iTrader: (5)

Ever figure this out..I have a similar issue.