Fusebox internals - map/diagram

[John Cody Forbes]

Absolutely correct. It's still worthwhile. 5 bad coils are pretty unlikely, so if you've got NOTHING this is at least as good as checking a plug wire with an inductive meter or timing light. 

POS = Power Output Stage. The early VAG coil on plug cars have them. It's a small pack of transistors so the current flow to power the coils doesn't flow through the ECU. An AAN has two of them, they have three coil circuits each.

-Cody (mobile)

On Sep 25, 2010, at 11:58 PM, Huw Powell <audi at humanspeakers.com> wrote:

> That tests the ECU and whatever POSs are.
> 
> It doesn't actually "check for spark", though.  Bad coil, bad plug, drowned spark, you wouldn't find them, right?
> 
>> Just use a logic probe to back probe the coil connector for checking
>> for spark. If the signal is getting to the coil then the ECU is doing
>> it job as well as the POS's.
> 
> 
> -- 
> Huw Powell
> 
> http://www.humanspeakers.com/audi
> 
> http://www.humanthoughts.org/