Re: Cruise Control Diagnostics

[Huw Powell <human@nh.ultranet.com>]

>  However, the electrical
> schematic CC section shows a factory test connector.  So my questions:
> 
> Is lack of diagnostic information an oversight by Bentley, or is the CC
> untestable other than demonstrating performance on the road?
> 
> Where is the control module exactly? (1988 90q)

The module should be (wher it always was on older cars) basically behind
the radio.  A silver box about 1 x 3 x 5 inches.  The "test connector"
just taps into 3 of the 8 wires going to it.

My Bentley goes into a detailed troubleshooting guide, most of which
ascertains the integrity of your wiring, and contains only one error... 
I am on the verge of condensing it onto my cruise file but haven't yet.

What was the anomolous behaviour you mention?

the wiring tests will indicate step by step the functioning of every
component (you just check resistance of the inductuve pickup at the
speedo) except the actual operation of the ecu.  the tests are done by
unplugging the ecu (which if you're lucky can be done without major
dismantling) and attaching various ground/12v leads to the 8 pin
connector.

-- 
Huw Powell

http://www.thebook.com/human-speakers

82 Audi Coupe; 85 Coupe GT
http://www.nh.ultranet.com/~human