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1Back to top Go down   Temp/Fan issue Empty Temp/Fan issue Wed Oct 08, 2014 7:47 am

Andy S

Andy S
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The fan on my K100LT’ ’88 suddenly stopped working a while ago. Been trying the system going again but nothing seems to work to get it in stock condition. 
Heres what all Ive done:
Replaced fan motor
Replaced temp sensor
Cleaned ground point on the frame (no corrosion found)
Check for broken/loose wires (none found)
Fan spins by connecting A2 to E
Overheat light NEVER COMES ON, no matter what the temp is
Taking some hints from the forum and since none of the above worked;  connected E, (in the female connector  temp relay) to the battery +ve. Put a manual switch to make fan go.
Inserted the relay on top of the connector and put everything together.
                   
Result:
-fan works when I put it on which is when  temp gauge mid-way mark.
-bike starts fine,  idles fine, revs great up to 4-5k, but jerks a lot only when riding in gear at operating temp.
 Question:
-could this be due to bad temp signals to FI some how
-clogged fuel filter/line etc. now.
Any help appreciated –I’m quite lost!

    

2Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 10:51 am

RicK G

RicK G
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Hi Andy
It seems to me that you may have 2 separate problems. The temp sensor has 2 sensors in one unit, one for the fan and one for the ECU/temp light.
Have you got a good circuit diagram and manual? If you need them PM me and I can supply them.
Check that the sensor has a good earth to the water riser as each of the 2 sensors work to earth and we have seen a couple that have had an earth problem and were fixed by a good clean. Have you got the correct sensor the K1100 16v looks almost the same but only has one sensor in the housing.
The fan will turn on at 103°C and the light comes on at 111°C so just because the fan comes on doesn't mean the light will come on


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

3Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 11:10 am

Inge K.

Inge K.
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@RicK G wrote:Hi Andy
The temp sensor has 2 sensors in one unit, one for the fan and one for the ECU/temp light.
Have you been smoking something illegal again Rick? Shocked
It's one sensor to the ECU, the other to the relay that manages the fan and warning lamp.
Just check the wiring diagram.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

4Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 11:56 am

Inge K.

Inge K.
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@Andy S wrote:
Fan spins by connecting A2 to E
Overheat light NEVER COMES ON, no matter what the temp is
Taking some hints from the forum and since none of the above worked;  connected E, (in the female connector  temp relay) to the battery +ve. Put a manual switch to make fan go.
Inserted the relay on top of the connector and put everything together.               


The problem must be in either the sensor or the relay, to check the sensor......
measure the resistance to ground both at the relay socket (E) and in the ECU contact (10)
the values should be equal or very close to.

What doesn't quite make sense is that the fan starts when connecting the sensor (E)
and the fan 12V+ supply wire (A2) together.
And then the sensor (E) and 12V+ together.
Are you shure you haven't mixed the designations?

The fan should start when bridging A2 and 15, or A2 and 9 in the relay socket.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

5Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 12:32 pm

Andy S

Andy S
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active member
how does one insert an image here Smile
the insert an image or host an image doesnt work.

    

6Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 12:39 pm

Inge K.

Inge K.
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VIP


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

7Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 12:57 pm

Inge K.

Inge K.
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VIP
TEST


Temp/Fan issue 16110


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

8Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 1:44 pm

Andy S

Andy S
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active member
ljfljsal;flkas;jf


Rick many thanks.

Following is my response:

>>Yes, I have a circuit diagram, thanks. Will try to trace wires if you walk me thru it.

>>It’s a 8V K100LT 1988- VIN 05060516

>>Temperature sensor 61311459197

Got it by part / VIN number from BMW AG, so it should be the right one.

>>cleaned the contact surface b/w the sensor and the engine housing thoroughly at installation.

>>cleaned the grounding of the 6 earth lugs on the frame left main tube

>>I don’t know the temps actually, but while checking if the fan came on, I waited for it to be warm enough for the expansion tank to mildly start spewing coolant.

>> INGE san, thanks for your help.
This is the spade ive connect to battery. Pls comment.

Temp/Fan issue Photo14

Questions

>>Ive given power to the E (purple/yellow) pin on the female directly from battery with a switch. Is that ok, or …?
BTW, the fan will come on even if the bike is off.
Asking because, as long as she runs ok, I don’t have a problem with a switch.

>>In order for the switch to work in a case like mine, does the relay have to removed or does it stay on?  I have kept it jacked in.

    

9Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 2:17 pm

Inge K.

Inge K.
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@Andy S wrote:>>Ive given power to the E (purple/yellow) pin on the female directly from battery with a switch. Is that ok, or …?

The E terminal is the connection to the sensor, and you would possibly fry the
relay by connect this to 12V+.
But you could connect this to ground to test if the relay functions properly,
then the fan should start and the warning lamp show.

The wire you have put in the relay socket on the picture is connected to
terminal A2 which is the output from the relay to the fan motor, this
connection is OK to use via a switch.


Temp/Fan issue Kontak13


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

10Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Wed Oct 08, 2014 6:06 pm

Crazy Frog

Crazy Frog
admin
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@Andy S wrote:
>>Yes, I have a circuit diagram, thanks. Will try to trace wires if you walk me thru it.

Have you seen this diagram ?
Just click on the "fan/temperature" tab and you will see the whole circuit for the fan.

CF


__________________________________________________
Temp/Fan issue Frog15Temp/Fan issue Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

11Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Thu Oct 09, 2014 2:58 am

Andy S

Andy S
active member
active member
Thank all for your support.

i shall make the switch permanant knowing that its safe to use and not interfereing in any other function except the fan.

now posting the hesitant engine in a seperate post.

Cheers!

    

12Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Thu Oct 09, 2014 3:08 am

Inge K.

Inge K.
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Could be a better idea to find why your fan doesn't start in the first place in my opinion.

If it functions as it should you don't have to monitor the temp all the time,
the switch you still can have beside if you want the fan to start earlier.

It's described earlier in this thread how to test the sensor and relay.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

13Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Thu Oct 09, 2014 3:39 am

Andy S

Andy S
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active member
yes, will do exactly that!

many thanks!!

    

14Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Thu Oct 09, 2014 6:44 am

Andy S

Andy S
active member
active member
Since i have the attention of all you K100 gurus, another small question pls.

this jack has been dangling near the water bottle ever since i got the bike some yrs ago.

can anyone tell me what it leads too etc. on a circuit diagram?

i can not locate male of this anywhere in that neighbourhood.
thanks in advance


Temp/Fan issue Photo18

    

15Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Thu Oct 09, 2014 7:21 am

RicK G

RicK G
admin
admin
It is for interrogation and reset of the ABS system.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

16Back to top Go down   Temp/Fan issue Empty Re: Temp/Fan issue Thu Oct 30, 2014 5:08 am

Andy S

Andy S
active member
active member
Put a small manual switch to put the fan on/off as i please.
Powered the y/p female under the temp sensor relay and closed it up.

Not perfect, but works for me.

Couldnt have done it without you gents help!

Temp/Fan issue Dsffas10

    

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