No start unless no AFM *FIXED*- Rev 2 Turbo

PaulWoods · Post by **PaulWoods** » 25/12/13 10:17

In fact, you may well find the starter motor has tried to use AFM circuitry as a ground, which has now damaged it, wouldn't surprise me at all.

Shaleskin · Post by **Shaleskin** » 25/12/13 16:22

PaulWoods wrote:Another thing that might help, when the AFM goes bad the CEL won't illuminate.

This is an interesting point. If I disconnect the AFM would I expect it to show the CEL again if the AFM is the cause?

EDIT!:

Well, disconnected the AFM clip and BAM! The engine light illuminated on key turn... The problem that started this (as well as the grounding issue) could also be the problem to end it.

Although, Surely if it was fried/damaged in some way I wouldn't get a reading from the terminals?

Merry Christmas all!

PaulWoods · Post by **PaulWoods** » 25/12/13 17:29

As I thought, your AFM is causing a problem , probably damaged by lack of starter ground

Sent from my GT-I9505 using Tapatalk

Shaleskin · Post by **Shaleskin** » 28/12/13 13:12

PaulWoods wrote:As I thought, your AFM is causing a problem , probably damaged by lack of starter ground

Sent from my GT-I9505 using Tapatalk

Just want to confirm before I purchase another AFM that it is definitely the AFM. With it disconnected, it starts and then stalls within a few seconds but with it connected it'll just keep turning over endlessly.

If I leave the key in the ON position and disconnect the the clip to the AFM housing I can hear a click somewhere behind the inlet manifold and then a whirring noise from a pump up front stops after a few seconds and the EML illuminates again. As soon as I connect it again the EML goes out and the pump up front starts whirring away again endlessly. if I leave it slightly connected and let it connect and disconnect with a fingers touch the clicking sounds like a relay but from behind the inlet manifold?

If all of this is just me looking for an easier excuse to make my AFM work then just say and I'll purchase another, only reason I'm hesitant to is because it still give back healthy results so I look at it as if it's going through the AFM fine and going elsewhere that's possibly causing an open circuit once I connect the AFM...

Thanks for your help so far everyone!

jimi · Post by **jimi** » 28/12/13 13:37

One open circuit is the same as another, when the plug is out you have an open circuit and you are able to start the car, with the plug in it won't start ....... so it can't be causing an open circuit can it ? or it would just do the same, therefore it must be causing a low resistance or short on some part of the circuit that it shouldn't be.
I don't think you have any other choice other than trying a different AFM

Shaleskin · Post by **Shaleskin** » 28/12/13 19:35

jimi wrote:One open circuit is the same as another, when the plug is out you have an open circuit and you are able to start the car, with the plug in it won't start ....... so it can't be causing an open circuit can it ? or it would just do the same, therefore it must be causing a low resistance or short on some part of the circuit that it shouldn't be.
I don't think you have any other choice other than trying a different AFM

Yeah that makes sense. All right, just purchased another now so when it arrives I'm sure it'll run fine and can start fixing some other minor problems!

Cheers

Chris_D · Post by **Chris_D** » 28/12/13 22:02

Sounds to me like it's shorting out the 5V rail. I would say it's something broken in the AFM but also possible you have a cooked wiring loom shorting the 5V to one of the signal wires so that when the AFM grounds the signal wire it takes down the power.

try the AFM first.

PaulWoods · Post by **PaulWoods** » 30/12/13 12:46

I know for a fact that a lack of starter motor ground melts the loom on the car, so i'll be surprised if there isn't more than just the AFM faulty.

Shaleskin · Post by **Shaleskin** » 06/01/14 18:59

Right! Thought I'd post an update as It's always nice to read through a post with problems to then get to the bottom of what was causing the issue beforehand!

My replacement (2nd hand unit) AFM arrived today. Plugged it in, BANG! EML lit up like a Christmas tree! Turned the key over, struggled for about 5mins and then ran smoother than I've ever had it since ownership last September(ish)!

So yeah, my ground from transmission/engine to chassy wasn't doing it's job properly and so (I assume) my AFM was used as a ground as was the little ground cable used by the ECU (hence it melted).

happy it's now working so thanks for your help people and now to tackle the rocker cover gasket

PaulWoods · Post by **PaulWoods** » 06/01/14 19:05

You're welcome.

jimi · Post by **jimi** » 06/01/14 19:11

Result !

MRturboTom · Post by **MRturboTom** » 06/01/14 20:02

Great stuff

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