Idle Stabilizer RELAY?!?

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <Pine.SOL.3.96.980324153201.23256B-100000@iris.nyit.edu> Sachelle Babbar writes:

> I got a buch of spare relays with my car and decided to check out what the
> wierd looking ones do. The idle stabiliser relay is a double relay type
> thing. From the top, it looks like a black rectangle. Says VDO on it. I
> unplugged mine, plugged in the other an noticed an improvement in the
> idle. Best thing to do is go to a junkyard, tell them that you need a
> relay,but don't tell them what it is. Make it up. You pull it yourself and
> they'll probably charge you a few bucks. I'm not sure if the n/a is the
> same. You might want to check out ones from later years because they may
> be the same as a turbo. Good luck.

Jeez - you guys!
 
The ISV controller fitted to your cars is a _much_ more advanced piece of 
electronics than the ECU!
 
See how much of this works (socket view):


           ==+====+==                          ==+====+==
             |    |                              |    |
  +----------+----+------------------------------+----+----------+
  |                                                              |
  |   +--+    +--+    +--+                +--+    +--+    +--+   |
  |   |16|    |13|    |10|                | 7|    | 4|    | 1|   |
  |   +--+    +--+    +--+                +--+    +--+    +--+   |
  |                                                              |
  |   +--+    +--+    +--+                +--+    +--+    +--+   |
  |   |17|    |14|    |11|         [ ]    | 8|    | 5|    | 2|   |
  |   +--+    +--+    +--+                +--+    +--+    +--+   |
  |                                                              |
  |   +--+    +--+    +--+                +--+    +--+    +--+   |
  |   |18|    |15|    |12|                | 9|    | 6|    | 3|   |
  |   +--+    +--+    +--+                +--+    +--+    +--+   |
  |                                                              |
  +--------------------------------------------------------------+

(Contact 5 is chassis ground.)

       Tests with a DC voltmeter:

14 + 5 - ignition on - Power                        Battery Voltage

14 + 1 - ignition on - Code input B                 Battery Voltage

8 + 1  - ignition on
         throttle closed
         idle switch closed                         Battery Voltage

       Tests with a diode test lamp:

17 + 5 - engine running - RPM from ECU              Diode must flash

7 + 5  - ignition on    - road speed sensor
         left front wheel turned by hand            Diode must flash

       Tests with an ohmmeter:

13 + 5 -                - thermoswitch              800 to 1000 ohms
                                                    at 20c, 70 to 150
                                                    ohms at 80c

11 + 4 - ISV attached   - ISV resistance            3 to 8 ohms

       Tests for cars with air conditioning:

6 + 5  - ignition on    - E87
         air conditioning on                        Battery Voltage

2 + 5  - ignition on    - N25
         air conditioning on                        Battery Voltage


-- 
 Phil Payne
 UK Audi [ur-]quattro Owners Club