My daughter has a CEL on her 2000 Impala, here is the pertinent info from my AutoEnginuity software, Any ideas where to start trouble shooting?
I checked the plugs on the electric fans, they are hooked up. Where is the control circuit?

<title>AutoEnginuity OBD-II DTC Report</title><table align="center" border="0" bordercolor="#bebbbb" cellpadding="2" cellspacing="0" width="750"> <tbody> <tr> <td align="left" width="750">P0481 Cooling Fan 2 Control Circuit </td></tr></tbody></table>
<table align="center" bgcolor="#d0d0d0" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="middle">Freeze Frame (Frame 0) </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Fuel System Status Bank One </td> <td align="middle" width="50">Open Loop </td> <td align="middle" bgcolor="#e8e8e8" width="50"></td> <td align="left" bgcolor="#e8e8e8" width="275">Fuel System Status Bank One </td> <td align="middle" width="50">Open Loop </td> <td align="middle" bgcolor="#e8e8e8" width="50"></td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Fuel System Status Bank Two </td> <td align="middle" width="50">Not Reported </td> <td align="middle" bgcolor="#e8e8e8" width="50"></td> <td align="left" bgcolor="#e8e8e8" width="275">Fuel System Status Bank Two </td> <td align="middle" width="50">Not Reported </td> <td align="middle" bgcolor="#e8e8e8" width="50"></td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Calculated Load </td> <td align="middle" width="50">4 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td> <td align="left" bgcolor="#e8e8e8" width="275">Calculated Load </td> <td align="middle" width="50">4 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Coolant Temperature </td> <td align="middle" width="50">81 </td> <td align="middle" bgcolor="#e8e8e8" width="50">F </td> <td align="left" bgcolor="#e8e8e8" width="275">Coolant Temperature </td> <td align="middle" width="50">81 </td> <td align="middle" bgcolor="#e8e8e8" width="50">F </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Short Term Fuel Trim Bank One </td> <td align="middle" width="50">-0.78 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td> <td align="left" bgcolor="#e8e8e8" width="275">Short Term Fuel Trim Bank One </td> <td align="middle" width="50">-0.78 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Long Term Fuel Trim Bank One </td> <td align="middle" width="50">0.78 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td> <td align="left" bgcolor="#e8e8e8" width="275">Long Term Fuel Trim Bank One </td> <td align="middle" width="50">0.78 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Intake Manifold Absolute Pressure </td> <td align="middle" width="50">10.0 </td> <td align="middle" bgcolor="#e8e8e8" width="50">in.hg </td> <td align="left" bgcolor="#e8e8e8" width="275">Intake Manifold Absolute Pressure </td> <td align="middle" width="50">10.0 </td> <td align="middle" bgcolor="#e8e8e8" width="50">in.hg </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Engine RPM </td> <td align="middle" width="50">1082 </td> <td align="middle" bgcolor="#e8e8e8" width="50">r/min </td> <td align="left" bgcolor="#e8e8e8" width="275">Engine RPM </td> <td align="middle" width="50">1082 </td> <td align="middle" bgcolor="#e8e8e8" width="50">r/min </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Vehicle Speed </td> <td align="middle" width="50">0 </td> <td align="middle" bgcolor="#e8e8e8" width="50">MPH </td> <td align="left" bgcolor="#e8e8e8" width="275">Vehicle Speed </td> <td align="middle" width="50">0 </td> <td align="middle" bgcolor="#e8e8e8" width="50">MPH </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Air Flow Rate From Mass Air Flow Sensor </td> <td align="middle" width="50">1.08 </td> <td align="middle" bgcolor="#e8e8e8" width="50">lb/min </td> <td align="left" bgcolor="#e8e8e8" width="275">Air Flow Rate From Mass Air Flow Sensor </td> <td align="middle" width="50">1.08 </td> <td align="middle" bgcolor="#e8e8e8" width="50">lb/min </td></tr></tbody></table> <table align="center" border="1" bordercolor="#bebbbb" cellpadding="0" cellspacing="0" width="750"> <tbody> <tr> <td align="left" bgcolor="#e8e8e8" width="275">Absolute Throttle Position </td> <td align="middle" width="50">0 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td> <td align="left" bgcolor="#e8e8e8" width="275">Absolute Throttle Position </td> <td align="middle" width="50">0 </td> <td align="middle" bgcolor="#e8e8e8" width="50">% </td></tr></tbody></table>

 

i would think its a bad motor on the secondary fan or a bad relay on the secondary fan. the secondary fan is the fan on the passenger side of the car.

 

Ok, well I have checked further, there was a blown fuse on the #2 control. I replaced it reset the CEL, and it took a day, but it's back. I have hot wired both fans individually and ran to battery. PASSENGER side is smooth and quiet. DRIVERS side is noisy and the wire gets HOT fast when it spins. Maybe your wrong on which is which? (Not a big deal...) OR maybe the plugs got switched sometime.. who knows. But I imagine that fan is the culprit. How hard to change the fan and motor? Also, where do you get them? (ORileys carry them maybe? I'll call)

 

Ok, I have the bracket/pair of fan/motors out, and need to know how do you replace one? Do you have to drill out the three points where they anchor into the large bracket or what? Also there is a nut on the fan, I assume that it has to come off too?
I called O'Rileys, it looks like the motor is a dealer only item?