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post #1 of 16 (permalink) Old 02-02-2017, 12:37 Thread Starter
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Radiator fan issues

Hi guys

I have a strange propblem with my radiator fan that I have never experienced before.

It never used to come on or not that I noticed but over the last couple of weeks it's been coming on all the time. To the point where as soon as I turn on the ignition it's comes on.

Checked coolant level and it was slightly down so topped it up but its not moved since. The temperature gauge is reading half way as normal and not got any higher.

Plugged my sp acr4 in last night and it brought up the code 0601 twice and I can't clear either of them. It's getting annoying as I work away during the week so I do on average 400 mile a week and need the car to be reliable.

Any help would be much appreciated.
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post #2 of 16 (permalink) Old 02-02-2017, 15:43
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I would suggest to check CTS, coolant tempertaure sensor as it may be faulty giving false information to engine ECU which will assume engine temperature is high, switch on the fan, and might even interfere with your mpg.
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post #3 of 16 (permalink) Old 05-02-2017, 15:53 Thread Starter
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I have just changed the CTS and the fan is still kicking when I turn on the ignition. Anyone got any ideas?
I'm just waiting for the rover head gasket comments while I'm out and about.
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post #4 of 16 (permalink) Old 05-02-2017, 16:06
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I just have same situation with another car, but earlier year. Fans get on as soon as you give contact. Difference is he cannot start the engine. He manage to start it by pushing it. Problem is he cannot read OBD 2 codes as it is earlier version of ECU.
We tried and checked all voltage, cleaned all contacts, checked fuses and relays, but situation is the same.
Our last resort is to change ECU. He will see if he can find suitable ECU.

In your case you have OBD 2 code 0601 which means checksum error in the ECU, either as low voltage to the Engine ECU or ECU error. You may want to check voltage which feeds ECU. How good is your car battery?
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post #5 of 16 (permalink) Old 05-02-2017, 16:27 Thread Starter
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New battery about 2 months ago when it was really cold
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post #6 of 16 (permalink) Old 05-02-2017, 16:43
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Also worth to check fans relay if it is fine and not sticking.
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post #7 of 16 (permalink) Old 05-02-2017, 17:25
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Do you have aircon and the heater blower turned on - this makes the radiator fans run all the time (even if the aircon & heater blower do not actually work)
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post #8 of 16 (permalink) Old 05-02-2017, 18:18 Thread Starter
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Swapped the relays over to see if it was the relay but it's still happening.

Tried it with both the aircon and heater blower off. Still happening.

Really getting to me now
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post #9 of 16 (permalink) Old 05-02-2017, 19:08
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As long shot, you could disconnect the battery for a while, reconnect and try again (to reset the ECU).

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post #10 of 16 (permalink) Old 06-02-2017, 05:30 Thread Starter
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Tried leaving the battery off over night, no joy unfortunately
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post #11 of 16 (permalink) Old 06-02-2017, 12:35
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What does, the Live data output show ?
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post #12 of 16 (permalink) Old 06-02-2017, 13:19 Thread Starter
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Originally Posted by pervavore View Post
What does, the Live data output show ?
As in what did the temp show on my diagnostic?
I never thought to check it
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post #13 of 16 (permalink) Old 06-02-2017, 14:37
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Quote:
Originally Posted by rob_803 View Post
I have just changed the CTS and the fan is still kicking when I turn on the ignition. Anyone got any ideas?
I'm just waiting for the rover head gasket comments while I'm out and about.


Which CTS did you change. The two pin one for the ECU or the single pin one for the dash gauge.

Do you have aircon? If the aircon is on then the fan is also on - that is normal
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post #14 of 16 (permalink) Old 06-02-2017, 14:41
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Before changing anything the best way is to check the live data what sensor values the ecu dos really see :-) You may also look if the ecu does see any A/C request or high A/C pressure values, could also explain the fans.
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post #15 of 16 (permalink) Old 06-02-2017, 19:15 Thread Starter
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Quote:
Originally Posted by E_T_V View Post
Which CTS did you change. The two pin one for the ECU or the single pin one for the dash gauge.

Do you have aircon? If the aircon is on then the fan is also on - that is normal
The 2 pin blue one on top.

It's is air con, I have tried turning the air con on and off and nothing changes
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post #16 of 16 (permalink) Old 23-02-2017, 05:04
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Quote:
Originally Posted by Roverlike View Post
I just have same situation with another car, but earlier year. Fans get on as soon as you give contact. Difference is he cannot start the engine. He manage to start it by pushing it. Problem is he cannot read OBD 2 codes as it is earlier version of ECU.
We tried and checked all voltage, cleaned all contacts, checked fuses and relays, but situation is the same.
Our last resort is to change ECU. He will see if he can find suitable ECU.

In your case you have OBD 2 code 0601 which means checksum error in the ECU, either as low voltage to the Engine ECU or ECU error. You may want to check voltage which feeds ECU. How good is your car battery?
This other similar situation came to a conclusion. Problem was in one wire from main relay to engine ECU which rotten inside and only plastic isolation was holding the wire. Problem was it cannot be easily detected in order to replace it as isolation is in place.
When replaced, everything went to normal.
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