Focus mk1 2003 1.6 zetec se Low speed cooling fan issues
#1
05-16-2023, 01:39 PM
Focus mk1 2003 1.6 zetec se Low speed cooling fan issues
Hello
I am new here, and am looking for some help in finding the solution.
I just replaced the cylinder head and all the distribution stuff in my friend's broken focus mk1. The engine is working fine, but what I noticed the low speed fan doesn't start. It starts high speed when 120C is reached what I think is already too hot for some of the components, so I try to make it right.
there is a fault code p1474(low speed fan circuit)
When I remove the relay #15 (the green one) and connect it short the low speed is working
Also when I give ground to the pin on relay it starts the low speed fan what I guess means that the relay is ok
IF the low speed works on short the the resistor seems to be fine as well.
Maybe someone had such problem and found the reason?
I don't know how to check the connection between ECU and relay what is a candidate for the reason.
IF someone could help...
Thanks in advance
Regards
Kris
I am new here, and am looking for some help in finding the solution.
I just replaced the cylinder head and all the distribution stuff in my friend's broken focus mk1. The engine is working fine, but what I noticed the low speed fan doesn't start. It starts high speed when 120C is reached what I think is already too hot for some of the components, so I try to make it right.
there is a fault code p1474(low speed fan circuit)
When I remove the relay #15 (the green one) and connect it short the low speed is working
Also when I give ground to the pin on relay it starts the low speed fan what I guess means that the relay is ok
IF the low speed works on short the the resistor seems to be fine as well.
Maybe someone had such problem and found the reason?
I don't know how to check the connection between ECU and relay what is a candidate for the reason.
IF someone could help...
Thanks in advance
Regards
Kris
#3
05-17-2023, 02:26 PM
Thanks for Your reply
I found information below in another thread here. Sorry if I should post my question there but that thread is 12 years old and no post about if the problem was solved, so I decided to make a new thread.
If info below is true , I'd like to know how the CHT sensor commands the PCM to run the cooling fan (what is the procedure and how the signal looks like) and if the same sensor commands the PCM to start the fan when turning ac on? Because when I try to start ac the fan doesn't start as well.
I don't have any fault code about CHT sensor and it is showing the temperature when I scan the car
I found information below in another thread here. Sorry if I should post my question there but that thread is 12 years old and no post about if the problem was solved, so I decided to make a new thread.
If info below is true , I'd like to know how the CHT sensor commands the PCM to run the cooling fan (what is the procedure and how the signal looks like) and if the same sensor commands the PCM to start the fan when turning ac on? Because when I try to start ac the fan doesn't start as well.
I don't have any fault code about CHT sensor and it is showing the temperature when I scan the car
Cyclinder head temp.sensor is the sensor that command the pcm to run the engine cooling fan motor here are some few tips i hope this will help you bro.
Cyclinder head temp.sensor wire color bn/wh going to pcm.wh/vt going to pcm.
Dual pressure switch,wire color bn/rd going to pcm connected to the wire of chts bn/rd.wh/rd goinh to pcm.
Bk/wh coming from pcm is negative going to high speed engine cooling fan motor relay,this negative output coming from pcm is responseble to trigger the high
speed engine cooling fan relay.gn/wh is connected to power hold relay output it si 12v.red wire is connected to 50 amp.fuse.
Gn/bu is connected to secondary cooling fan motor.
Bk/bu is conneted to pcm,this wire is negative signal that trigger the engine cooling fan relay,this relay is different to high speed engine cooling fan relay.
Gn/bu connected to power hold relay splice together with gn/wh wire of high speed engine cooling fan relay.red wire of engine cooling fan relay is
connected to 50amp.fuse.gn/bu output of relay,engine cooling fan relay.is going to fuse 30amp.splice together of cooling fan motor diode.the remaining wire
of cooling fan motor diode is negatve.fuse 30amp gn/bu and gn/wh,gn/wh is going to engine cooling fan resistor,gn/bu wire of engine cooling fan resistor is
going to both wire of engine cooling fan motor gn/ye,and secondary engine fan motor gn/og.the remaining wire of both fan motor are ground.
Cyclinder head temp.sensor wire color bn/wh going to pcm.wh/vt going to pcm.
Dual pressure switch,wire color bn/rd going to pcm connected to the wire of chts bn/rd.wh/rd goinh to pcm.
Bk/wh coming from pcm is negative going to high speed engine cooling fan motor relay,this negative output coming from pcm is responseble to trigger the high
speed engine cooling fan relay.gn/wh is connected to power hold relay output it si 12v.red wire is connected to 50 amp.fuse.
Gn/bu is connected to secondary cooling fan motor.
Bk/bu is conneted to pcm,this wire is negative signal that trigger the engine cooling fan relay,this relay is different to high speed engine cooling fan relay.
Gn/bu connected to power hold relay splice together with gn/wh wire of high speed engine cooling fan relay.red wire of engine cooling fan relay is
connected to 50amp.fuse.gn/bu output of relay,engine cooling fan relay.is going to fuse 30amp.splice together of cooling fan motor diode.the remaining wire
of cooling fan motor diode is negatve.fuse 30amp gn/bu and gn/wh,gn/wh is going to engine cooling fan resistor,gn/bu wire of engine cooling fan resistor is
going to both wire of engine cooling fan motor gn/ye,and secondary engine fan motor gn/og.the remaining wire of both fan motor are ground.
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