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spent some time tonight testing the cooling system fan inoperation.
on the first pass of the test
koer test revealed the codes
53 - throtle position sensor wide open
81 - electro drive fan circuit failure **** bingo *****
65 - either overcharged or fuel system did not closed loop
38 - idle tracking switch open
so... we did some pokeing around and looked at the fuseable links - they all looked good - except when I took out onr of the 60 amp fusible links I saw it all burned up at the bottom - so I fugure hey I am onto something here.
Went to AZ and replaced the 60 A fusible link.
So here I am thinking that YAY - its fixed
So I ran the KOER codes again and this time something different happened - I got codes
65 - either overcharged or fuel system did not closed loop
38 - idle tracking switch open
Now I had two less codes so replacing the burned fuse link cured some of the codes.
NOW THIS TIME WHEN THE CODE READER WAS PLUGGED IN - as the engine heated up the fan cycled on and off normally. If I unplugged the code scanner the fan would no cycle anymore. I connected the code scanner again and the fan cycles on and off as it should.
WHAT DOES THIS MEAN - IS MY IRCM BAD - MAKE A NOTE HERE THAT without the scanned plugged in and even using the ac on max cool the fan (neither of them would come on). Put the code scanner back in and fans cycle as they should.
So - do I have a bad ircm - bad eec (etc sensor is brand new) - why would the code scanner make it work right.
Thanks in advance - I still need ideas and help....
on the first pass of the test
koer test revealed the codes
53 - throtle position sensor wide open
81 - electro drive fan circuit failure **** bingo *****
65 - either overcharged or fuel system did not closed loop
38 - idle tracking switch open
so... we did some pokeing around and looked at the fuseable links - they all looked good - except when I took out onr of the 60 amp fusible links I saw it all burned up at the bottom - so I fugure hey I am onto something here.
Went to AZ and replaced the 60 A fusible link.
So here I am thinking that YAY - its fixed
So I ran the KOER codes again and this time something different happened - I got codes
65 - either overcharged or fuel system did not closed loop
38 - idle tracking switch open
Now I had two less codes so replacing the burned fuse link cured some of the codes.
NOW THIS TIME WHEN THE CODE READER WAS PLUGGED IN - as the engine heated up the fan cycled on and off normally. If I unplugged the code scanner the fan would no cycle anymore. I connected the code scanner again and the fan cycles on and off as it should.
WHAT DOES THIS MEAN - IS MY IRCM BAD - MAKE A NOTE HERE THAT without the scanned plugged in and even using the ac on max cool the fan (neither of them would come on). Put the code scanner back in and fans cycle as they should.
So - do I have a bad ircm - bad eec (etc sensor is brand new) - why would the code scanner make it work right.
Thanks in advance - I still need ideas and help....