ISV circuit

[Phil Rose <pjrose@servtech.com>]

>
>As a general rule - if you break into an ISV circuit you _MUST_ switch
>the engine off and on again before making any measurements.  Most Audi
>(VDO) ISV controllers go on permanent strike if they see an open
>circuit to the ISV itself.  This situation can _ONLY_ be remedied by
>ignition cycling.
>
>- --
> Phil Payne

One exception appears to be the '91 200q (an exception to lots of things
except frequency-of-repair statistics). Pulling the plug on the ISV buggers
the idle speed but plugging it in again brings the idle right back to spec.
No ignition recycling needed.


Phil Rose				Rochester, NY
'91 200q				mailto:pjrose@servtech.com
'89 100