[gtpumps]

It won't cause a problem. It is working the same as before, except that the a/c fan pins are being used to trigger the radiator fans as well as the a/c fans. The ECU only pulls the fan relays to ground, so it is not as if the total fan current is passing through the ECU.

How is this going to help? The A/C fan only operate when the A/C is operating??? So if the A/C is off you will have NO RADIATOR FAN at all
Also the A/C fan runs at low speed all the time when the A/C is on it's not eng temp controlled.

 

[94AWDcoupe]

How is this going to help? The A/C fan only operate when the A/C is operating??? So if the A/C is off you will have NO RADIATOR FAN at all
Also the A/C fan runs at low speed all the time when the A/C is on it's not eng temp controlled.

low signal triggers fans by temperature.
high signal triggers fans with a/c switch.

it will work fine

 

[Wreckleford]

How is this going to help? The A/C fan only operate when the A/C is operating??? So if the A/C is off you will have NO RADIATOR FAN at all
Also the A/C fan runs at low speed all the time when the A/C is on it's not eng temp controlled.

Did you ever try it? Don't assume then. If you look at the 7 service manual you will see that it triggers the a/c fan based on temperature whether or not the a/c is on, and it has two speeds depending on the coolant temp.

 

[gtpumps]

Did you ever try it? Don't assume then. If you look at the 7 service manual you will see that it triggers the a/c fan based on temperature whether or not the a/c is on, and it has two speeds depending on the coolant temp.

I have been driving on an EVO7 ECU in my EVO6TME for 5 months
I have never seen the A/C fan come on without the A/C button ON and heater fan ON ie. air con operating.

At what engine temp is the A/C fan supposed to turn on?

 

[Wreckleford]

The question I asked is if you ever tried to use the a/c fan outputs to control the radiator fan? I have done a IV and a VI using the a/c outputs like this and both bring on the fans whether or not the A/C is on. The manual even explains that it turns on the a/c fan based on temperature whether or not the a/c is on. That's how I got the idea to try it in the first place. I don't remember the exact temps that the fans come in, but it is stated in the manual.

As I explained before, with the VI you have to tie the radiator fan wire to the a/c fan wire as it has two seperate circuits to control the radiator fan and a/c fan. With the IV it is not necessary because the circuits are already tied from the factory (i.e. the four ECU does not have seperate outputs for a/c and radiator fans).

Thinking some more about it, based on what you described, your car is probably wired so that the radiator fan is running off of the low speed a/c output and the a/c condenser fan is running off of the high speed a/c output.

 

[cossie1]

The question I asked is if you ever tried to use the a/c fan outputs to control the radiator fan? I have done a IV and a VI using the a/c outputs like this and both bring on the fans whether or not the A/C is on. The manual even explains that it turns on the a/c fan based on temperature whether or not the a/c is on. That's how I got the idea to try it in the first place. I don't remember the exact temps that the fans come in, but it is stated in the manual.

As I explained before, with the VI you have to tie the radiator fan wire to the a/c fan wire as it has two seperate circuits to control the radiator fan and a/c fan. With the IV it is not necessary because the circuits are already tied from the factory (i.e. the four ECU does not have seperate outputs for a/c and radiator fans).

Thinking some more about it, based on what you described, your car is probably wired so that the radiator fan is running off of the low speed a/c output and the a/c condenser fan is running off of the high speed a/c output.

So doing it this way, the way you suggest to me before further up this thread.

The radiator fans work 100% as they should, without having to turn the a/c on, and the car does not overheat ?

Also I have been told the evo 7 onwards has some kind of control box for the rad fans, I am guessing this isn't needed either ?

 

[gtpumps]

Thinking some more about it, based on what you described, your car is probably wired so that the radiator fan is running off of the low speed a/c output and the a/c condenser fan is running off of the high speed a/c output.

You assume a lot
Actually both the hi and low speed radiator fan relays are unplugged so I don't damage the EVO7 ECU while I figure all this out. It's winter here so I just run with A/C fan on, aircon compressor unplugged.

I have not reversed the A/C hi and lo wires to suit the EVO7 ECU so in my case the A/C fan should come on at hi speed as you say at a certain engine temperature. I need to check this.

The reason I have not already sorted this out is I am considering running the EVO7 variable speed fan setup, just waiting for something used to turn up at the right price
However summer is comming must sort it out.

 

[Mystic]

good work guys on simplifying these ecus. Patiently awaiting the evo 9 ecu diagram . I want to put an evo 9 engine in an evo 4 (retaining the mivec and i think this would assist me greatly......sorry if its a bit off topic but has anyone put a 9 engine in a 4-6 yet with fully functioning mivec?

 

[Wreckleford]

So doing it this way, the way you suggest to me before further up this thread.

The radiator fans work 100% as they should, without having to turn the a/c on, and the car does not overheat ?

Also I have been told the evo 7 onwards has some kind of control box for the rad fans, I am guessing this isn't needed either ?

Yes it is the same description. YOu won't need to turn on the a/c, the fans both work, the car won't overheat.

Using the a/c fan outputs is done to avoid using the Evo 7 up fan controller.

 

[Wreckleford]

I want to suggest that there is a mistake in this diagram (and in the Mitsu service manual) with regards to pins 8 and 22. I' ve checked a stock 7 and found that pin 8 is the fuel pump and 22 the a/c compressor as per the 4-6. Can anyone confirm this?

I have now checked another 7 and confirmed the above. The wire locations are correct for the 8s I have checked though.

 

[Wreckleford]

You assume a lot
Actually both the hi and low speed radiator fan relays are unplugged so I don't damage the EVO7 ECU while I figure all this out. It's winter here so I just run with A/C fan on, aircon compressor unplugged.

I have not reversed the A/C hi and lo wires to suit the EVO7 ECU so in my case the A/C fan should come on at hi speed as you say at a certain engine temperature. I need to check this.

The reason I have not already sorted this out is I am considering running the EVO7 variable speed fan setup, just waiting for something used to turn up at the right price
However summer is comming must sort it out.

I'll try to send you the page from the manual. Alternatively you oculd just try it. If you run your car until it gets hot and then turn of the a/c, the fan should still run.

The one assumption I make in all of this is that the TME is wired exactly the same as the regular 6, but I would be surprised if there was any major difference.

 

[cossie1]

Can you just tell me what pin 87 actually does on the evo 6's please.

 

[Wreckleford]

Can you just tell me what pin 87 actually does on the evo 6's please.

Pin 87 is the idle switch - I assume it tells the ECU that the throttle is closed, but I haven't checked it. The 7 ECU doesn't have an input for that, so it won't be required if using the 7 ECU.

 

[cossie1]

Nice 1, thanks mate

Can you just confirm that this is what does need doing please.

Swap wires 32 and 34 (A/C Lo and Hi fan). Disconnect 20 and 21 (rad Lo and Hi fan)and connect 20 to the wire that is now at 32 and connect 21 to the wire that is now at 34.

As you edited your original post to say you were not sure if 32 and 34 needed swapping.

 

[grants]

I have now checked another 7 and confirmed the above. The wire locations are correct for the 8s I have checked though.

Thanks for checking, I've just looked a a GEMS manual which also confirms. Can you recall the if the wire colours are also wrong ?

Grant

 

[Ian_Evo]

I'm hopefully going to fit my E6 ECU in my E4 this week, how do i check to make sure the Pin 33 wire needs cut or its ok? Also, will i need to change injectors at the same time? Is the car drivable as normal once the ECU is fitted? thanks

 

[Wreckleford]

Thanks for checking, I've just looked a a GEMS manual which also confirms. Can you recall the if the wire colours are also wrong ?

Grant

I didn't check the wire colours.

 

[cossie1]

I'm hopefully going to fit my E6 ECU in my E4 this week, how do i check to make sure the Pin 33 wire needs cut or its ok? Also, will i need to change injectors at the same time? Is the car drivable as normal once the ECU is fitted? thanks

IIRC pin 33 does definately need cutting (but cut it as far up the loom as you can, to make sure there is plenty to rejoin it should you ever need to.

And you will need the e5 /6 injectors at the same time, otherwise your car will not run very well.

 

[Ian_Evo]

cool, yeah i got some here, prob need to fit the walbro at the same time im guessin! cheers 4 the info mate!

 

[cossie1]

Thanks Wreckleford and grants for all the info in this thread.

I have now fitted an Evo 7 Ralliart Ecu to my 6 RSII.

As my car is an RSII there was no need to swap pins 8 and 22, not sure if this would need changing over on a GSR or not.

I did as Wreckleford said, and swapped 32 and 34 round, then wired 20 to 32 and 21 to 34, and left 87 disconnected.

All seems to be working as it should, including the fans and aircon systems

P.S don't know if it it is because my car is an RSII but 32 on my car was Blue with Red trace and not Blue with Yellow as in the diagram.

Once again, Thanks Guys for your help