Technical Help!! cooling fan

[Deckchair5]

Ok well that's good news as you can get the relays and resistor system up and running and that's the more reliable and robust system than the rad fan ecu method

With wire colours then they're often totally different to the wiring diagram but never mind, trace back to the source
You want to leave the rad fan ecu right out of the system


Connector E pin A on the engine compartment panel B1 is the fast fan speed so this needs to go directly to the fan and also to one side of the resistor. It's shown as wire colour green here but it sounds like yours is totally different colours

Then the same connector E pin C connects to the other side of the resistor. Wiring colour is shown as light blue/black here

Then with the rad fan connected to earth you should have a working system
I expect there is nothing wrong with the original resistor as you would still have fan high speed working without it and the resistors rarely go wrong

Make sure the fan blows the correct way
If not then just switch the fan connectors around

 

[Muppet1]

Right think i know what the problem is,

I assume connector E is the plug thats on the end of the wires going to fan and resistor, If so which pins should have power going to them when just the inj is turned on but car not started. Pin A Doesnt show any power, pin B (Middle) shows 12.42 volts??? and pin C nothing with car not started.

Same with the car started power and only pin B.

Now pin A and C are wired in plug but B is only showing power at fuse board end and there is no wire in present wired configuration ie Resistor set up.

 

[Muppet1]

Well have connected the red wire to the middle pin of the connector and i have fan on constant fast as well. So that not right.

 

[Muppet1]

Right pin A does indeed go to the ran fan and one side of the resistor, pin C straight to the other side of the resistor.

So i need to find out i guess how to get the relevent wire and power to pin A and quite possilby pin C. Ooooooo my head hurts!!!

Updated to add, the plug marked to rad fan ecu when i join them two wires together i drop fault code 0480????? Still have 0481 which is i assume the slow speed fan which is also why my air con isnt working as its not getting a signal.

Also getting 13.5 volts on both wires going to the resistor as well.

 

[Deckchair5]

I assume connector E is the plug thats on the end of the wires going to fan and resistor,
Have a look at the diagram up above and it shows the connector E location on the engine bay fuse/relay box B1

If so which pins should have power going to them when just the inj is turned on but car not started.
Niether A nor C should have any power on them until the rad fan is required so that will be either when the eng temp gets up high enough, (usually just past the centre mark in the dash gauge) or if a high temp/pressure signal comes from the air con linear pressure switch. If the low speed fan can't take care of it then the high speed should turn on at higher temps

Pin A Doesnt show any power, pin B (Middle) shows 12.42 volts??? and pin C nothing with car not started.
That's correct

Same with the car started power and only pin B.
Also correct. If there was power on pins A or C all the time then the rad fan would be going all the time

As you're getting good at using a multi meter now then have a read through my Stilo Guide of how to test your rad fan switch operation by simulating higher eng temps with a simple variable resistor without having to take your engine up to those higher temps. You might want to do that or you can wait until your engine temp comes up and see if the rad fan comes on but be ready to put your interior heater on full blast if it doesn't

Also getting 13.5 volts on both wires going to the resistor as well.
Whilst the rad fan is on at high speed you will have battery voltage on either side of the resistor, so, if that's what you mean then that's correct

On low speed fan operation you will see 13.5v on one side of resistor and much lower on the other side

 

[Muppet1]

So where to go from here then decks, As it appears that everything is as it should be ie power in Center pin, voltage where it should be.
Im going to see tomorrow if i can get the car hot to see if the fan cuts in as she gets warm if thats the case i only need to try to find out why the low speed fan and air con wont work. As i had a good look at your guide but thats well out of my range of skills im afraid.
If that doesnt work could the problem be the temp sender but surely i wouldnt get the two fan errors then.

 

[Deckchair5]

If you have everything connected up as in Post 21 then it's just a question of trying it. You know the fan works and low speed fan relay should switch on through Pin C and then high speed if it's required on pin A (although you may not be able to get engine temp up that high with these lovely august weather temps we're getting without a simulator)

i only need to try to find out why the low speed fan and air con wont work
One thing at a time, find out whether your low speed fan now works

If you have low pressure in your air con system then A/C compressor won't be allowed to start up

 

[Muppet1]

Well using the ecu software i was showing 85c and no cooling fan and also i cant test fan 1&2 using the ecu software that yani has developed.

So there has to be something somewhere that i have over looked. This air con thing has me perplexed as it was working a few days ago and now its not and im not showing any fault codes either. The only fault code is 0481 but having said that 0480 would be there if it wasnt for the fact that i have the two wires of that plug thats ment to go to the fan ecu joined together.

Has anyone got the time maybe to look at there jtd and see if they have a plug in the under bonnet fuse area that isnt joined to anything, just 2 wired plug with red/yellow and peach or light brown.

I had the air con drained, vacuum tested which it held 1mb for 15 mins and then refilled with dye and oil and 500g's of gas. This was monday this week.

 

[Deckchair5]

At 85C the engine thermostat hasn't opened yet so at 88C it opens and sends coolant to the radiator for cooling and then it will need to be much higher before it needs engine radiator cooling fan.

Make your own test gear simulator as described in the Guides then you won;t need to run your engine up to temp to find out if the rad fan circuits work. It's really not difficult, have another read through

[FONT=&quot]P0481 Cooling Fan 2 Control Circuit Malfunction[/FONT]
That is more like high speed fan setting but is your wiring up now correct as in post 21?

With your air con, first test i would do would be check the static low pressure and see if it's enough for the system to start up. When a system works when first charged up and then stops a few days later then it's very likely to be small leak

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[Muppet1]

You said earlier on in posts, Relays and resistor. Could it be a relay not working and which one would it be. Its about the only thing we havent thought about so wondering if it indeed cound be that.

 

[Davren]

From the wiring diagram Decks posted at #21 above for the resistor based system. Relay T6 is for slow speed fan. (the output from pin 87 of relay T6 goes through the resistor).

Relay T7 is for fast speed fan. (the output from pin 87 of relay T7 bypasses the resistor).

Both relays are in the under bonnet fusebox.

 

[Muppet1]

nope doesnt appear to be the relays as have swapped the 2 with others and no difference!!

Blast!

 

[Deckchair5]

You're still getting the same fault codes?