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Cooling Fan on High


DPS.01
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Trying to figure this one out. 
with the vehicle idling for a while, the high speed fan will turn on as it should, however it does not cycle off. 
 

ED04 show 72 degrees…also not sure why OXY is highlighted….

I have lots to learn about use of the on board diagnostic system on these cars. 
 

When the car is turned off, the high speed fan turns off.  If vehicle is restarted, the fan stays off until the coolant temp rises. 

 

CA023571-5CDF-4098-AAC5-C787338ABA22.thumb.jpeg.89c54da691b03608e53be6f372d56b21.jpeg

Edited by DPS.01
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Well that is open loop. OXY on steady just means the O2 is not cycling.  Does not look like it has been running for long. AC is not on. If HI coolant fan is on, high speed relay is probably stuck on.

ps is 72 degrees C,  162 F.

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41 minutes ago, DPS.01 said:

ED04 show 72 degrees…also not sure why OXY is highlighted

I believe that is Celsius. About 160* F. Still not warm enough to go into closed loop or turn on fans. I don't think the cooling fan should running. Go to "ECM Outputs", look at E009 and E010 and see if the ECM is commanding the fans to run. I expect Padgett is right about a stuck relay.

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Completely missed the C to F. 

I will look into the stuck relay, but I am confused regarding the fan powering off when the ignition is turned off.  If the relay was stuck I would think the fan would still be running even with the ignition off. 
 

Thanks for the response. 

going to look for some schematics. 

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I will check E009 and E010 on ECM outputs.  I will try that tomorrow, if not it will have to wait till later in the week. 
 

thanks for the direction. 

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I think 216 Fahrenheit is the trigger temp for the fan to activate. I wonder what temp is showing on the gauges screen display when the fan kicks on and how far below 216 it would normally shut off. 

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28 minutes ago, Padgett said:

Well that is open loop. OXY on steady just means the O2 is not cycling.  Does not look like it has been running for long. AC is not on. If HI coolant fan is on, high speed relay is probably stuck on.

ps is 72 degrees C,  162 F.

Correct AC is not on. 
Vehicle has “low refrigerant level”… on the list to fix. 
 

Vehicle was idling for about :20 minutes or so before the high speed fan turned on. 
 

will try to get info from the gages screen for temp indicated when fans go to high. 

Edited by DPS.01
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21 minutes ago, DPS.01 said:

I will look into the stuck relay, but I am confused regarding the fan powering off when the ignition is turned off.  If the relay was stuck I would think the fan would still be running even with the ignition off. 

What you are saying makes sense. Cooling fan power is hot all the time but cooling fan relay control is only powered when the key is in the run  position. I think the next step is to check diagnostics to see if the ECM is picking up the cooling fan relay(s) for some reason.

 

cooling_fan_diagram-89.jpg

 

 

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Note: 89 is different from 88. For 89 LO is both fans in series. HI is both fans in parallel. Ground is applied though two connections to the ECM.

 

Do you have one fan on or both ?

Edited by Padgett
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