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WRX ECU fault returned after new ECU fitted


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I have an issue and I'm hoping someone can help with this.

 

My 2007 Imprezza WRX had no signal on the alarm key, it was concluded that it was an old alarm system and that a new one should be fitted.

I collected the Subaru and went to drive away after the new alarm system was sorted. The car immediately threw up a fault code.

It was related to the cooling fan. Apparently the code would appear, then go straight into history. This happened every time the codes were cleared.

It was concluded that the ECU was at fault - So the ECU was sent away.

Some time later it was determined that the chip on the ECU was fried.

The company ordered a new ECU.

This ECU was coded for my Subaru and sent back.

I went to collect my Subaru today, paid the bill, and as I was leaving the fault code returned. After putting it through the scanner it was determined that it was the same fault code.

I'm not sure what to do next so any advice would be greatly appreciated.

 

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Is this the factory alarm or some random aftermarket one?

 

Is this the progress?

1) car wouldn’t start I guess

2) suspected fault with the immobiliser.
3) replaced the controller for immobiliser 

4) new fan fault code appears now car goes

5) replaced ECU

6) still have fan fault code 

 

 

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Hi,

 

It was a mongoose alarm, basically the key wouldn't lock/unlock the doors.

They replaced it with an AVS alarm with a turbo timer.

The car starts fine, but the fault code came up as soon as I got in and started the car.

I took it back and they did some more troubleshooting -only to conclude that it was the ECU.

The ECU was replaced, but as soon as I got in the car and started it, the fault code came back.

I'm wondering if the diagnosis on the ECU was wrong.

Not sure on this one.

 

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I’d say the ECU is and was fine. 


if it’s reporting a consistent error then that’s generally a good thing.
isnt there a diagnostic menu option for test running the fan. Subaru dealers should have run that test. 
 

simple one turn the AC on and see if both fans go.
You can also drive around and see if the fans come on when the car gets hot. 

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