16v knock sensor diagnosis w/led test light

[ranahan@charter.net (John Erickson)]

I've never done the proper test on a knock box, but Brian 
W. had me test mine once using the following method:

Pull the connector off the knock box and take the 
backshell off the connector.  Expose the back of the pins.

Plug the connector back into the knock box and turn on the 
ignition.

Connect the back of pin 12 to ground (find pin 12 before 
you plug the connector back into the knock box).  If your 
fuel pump relay turns on the fuel pumps, your knock box is 
shot.

I jumpered my fuel pump relay to ground and drove the car 
that way for almost a year (sometimes its hard to find a 
cheap knock box).  It works, but the ignition is retarded 
(as I mentioned in the other thread) and the fuel pumps 
will be on anytime the ignition is on (no automatic 
shutoff after 2-3 seconds).

HTH
John
Long Beach




On Tue, 13 Aug 2002 12:45:38 -0700 (PDT)
  "T. Reed" <treed2@u.washington.edu> wrote:
>I've been going through the Bentley performing various 
>tests on ignition
>and fuel stuff, but there's one in particular that I 
>haven't been able to
>do yet..
>
>the "Knock Sensor System Diagnosis" in the ignition 
>section, page 7-16.
>
>It says "there is a test connector near the ignition 
>coil. It has a single
>wire, usually blue/brown in color, leading to terminal 4 
>at the knock
>sensor control unit harness connector."
>
>Now, I'm supposed to hook up an LED test light to this 
>connector, but I
>can't seem to find it. There are several other connectors 
>in the
>vicinity, but none of them are blue/brown. If memory 
>serves there is a red
>connector with a green wire on it.. I can't remember the 
>others.
>
>Anyone want to point me in the right direction? (or is 
>this one of those
>typos in the Bentley?)
>
>Thanks,
>
>-Toby
>
>
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