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Discussion Starter · #1 ·
My R has cut out recently and then wont start. Turns over fine etc, just wont start

Its in intermittent fault although its getting more and more regular now.. (its now in the garage).

The fuel pump wasn't priming when the door was opened and looking at the codes the car states " Not communication with the fuel pump and ECU).
We have replaced the 409 relay hoping that this was all it was, it worked so we put the car back together but its just cut out again....

Now the garage is saying due to the "no communication" code, it must be the ECU so they want to either have it refurbished or replaced.
This is getting expensive so want to make sure that the ECU is at fault.

Can anyone shed any light on this??

Any help would be great.
Cheers
 

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When your Fuel pump does not prime when door opens, that normally leads to the micro switch in door being mullered... (Actuator).
 

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As above, try the door control module, that being said ive never known a faulty one to actually stop a car starting!
 

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Discussion Starter · #4 ·
But shouldn't the pump prime once you turn it over anyway because you turn it over and it still doesn't start..?

Also - Would this cause the car to cut out once its running?
 

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Fuel pump not priming wouldn't cause the car to cut out, just make it take longer to start. You can get round it by leaving a 10 sec delay between switching on the ignition and starting the car. Fuel pump primes as soon as you switch on the ignition.

How does it cut out? does it cough and splutter, which would point to fuel starvation or immediate which would point to electrical.

You've ruled out the fuel pump relay so I would consider crankshaft speed sensor.

Has the car been mapped as some tuner's like Revo "lock" the ECU causing communication issues.
 
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Matt, I did have trouble with mine before changing the Actuator, Same symptom, would not start, then finally it started.
 

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Discussion Starter · #7 ·
Fuel pump not priming wouldn't cause the car to cut out, just make it take longer to start.

How does it cut out? does it cough and splutter, which would point to fuel starvation or immediate which would point to electrical.

You've ruled out the fuel pump relay so I would consider crankshaft speed sensor.

Has the car been mapped as some tuner's like Revo "lock" the ECU causing communication issues.
Cuts out immediately (no coughing)..

What do you think abut the fault "No communication with ECU"..?

Its history says it was mapped about 5 years ago but no official details included, just a receipt from a specialist... No REVO standard is what Im getting at.

Cheers
 

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In my opinion that points to an electrical issue such as a bad earth, faulty sensor etc.

It's hard to tell if the "no communication" is connected or not to the cutting out and pointing to a faulty ECU. It obviously hinders the diagnosis as you can't read fault codes.

I would replace the engine speed sensor (crankshaft) before replacing The ECU.
 

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I agree with Bob. Immediate cutting out can be the Crank Sensor. If it happens on depressing the clutch is can be the Coolant temperature sensor. That apart from bad earths etc, or faulty ignition switch, or even immobiliser issue. ECU issue is unlikely.
 

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Discussion Starter · #10 ·
In my opinion that points to an electrical issue such as a bad earth, faulty sensor etc.

It's hard to tell if the "no communication" is connected or not to the cutting out and pointing to a faulty ECU. It obviously hinders the diagnosis as you can't read fault codes.

I would replace the engine speed sensor (crankshaft) before replacing The ECU.
Thanks dude, suggested it to the garage and hoping for a better outcome.

They are trying to test the signaling between the fuel and the ECU when the problem actually occurs but since the relay was replaced its only cut out once and its running fine now.
However if it did it after it was replaced then its only a matter of time.
 

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If it was the relay then it would cough and splutter before it cut out due to fuel starvation.

Good luck and hope they get to the bottom of it. There is nothing worse than an intermittent fault like that especially "cutting out" as it can be dangerous.
 

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Doesn't sound like an ECU issue. Are there no other error codes when scanning? Need to isolate the path to follow (electrical or fuel).
 

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Mine did this about 4 months ago.

My ecu was toast.

New ecu and a flash of my map from the Phirm and all sorted.

Exact same symptoms as you.
Was there a physical issue (component failure) within the ECU or did your firmware get corrupted? Just curious..
 

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Was there a physical issue (component failure) within the ECU or did your firmware get corrupted? Just curious..
My car had been mapped by lots of different companies as nobody could get part throttle correct.

One of them had removed the ECU to map it. I think it just had a shit from all the messing about with it.
 

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Do you have a spare key for the vehicle you can use. It could be the immobiliser (key sync with dash). I had a similar issue many years ago with a MK4 V6 4motion. Very intermittent, but eventually nailed it down to the Key been the issue. Could unlock and lock all doors no problem so didn't really help identify the problem. Just noticed "immobiliser intermittent error" when scanning, used the "spare" key and fault went away. Ended up getting two new keys cut and programmed in. All issues solved.
 

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My car had been mapped by lots of different companies as nobody could get part throttle correct.

One of them had removed the ECU to map it. I think it just had a shit from all the messing about with it.
Cheers buddy, always interested to hear from others experiences. Think you are right, too much fiddling by different folk. Glad you got it sorted.
 

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Discussion Starter · #20 ·
Thanks everyone - Really appreciate you all jumping on this.

My man recons that its the ECU at fault due to the "no communication issue" but hes keen to wait until the issue happens again to test etc...
I mentioned the crank sensor but due to the code he doesn't think both issues are unrelated.

I have a spare key that I could drop him tomorrow so Il try that.

New ECU and coding will cost around £800 so if I do go down the ECU route Il get mine refurbed for about £150 + VAT. Anyone had experience with ECU refurbs?

Keep chasing and will revert
 
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