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Running Failure. What is this (pic) and what does it do? 200 1988

posted by  tbb2 on  Fri Aug 25 11:32 CST 2017
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last visit: Wed Jul 16 18:57 CST 2014
[RELATED]

I am working on a running failure.

In the pic what is the black rectangular flat box next to the in-line fuse and is the device next to it the Step Relay?

In the green books there is a "Breaker Unit" in the B230F computerized ignition system diagram that looks to do nothing except be activated by the Knock Sensor.
It looks a whole lot like the Throttle Position Switch. Is it the TSP and if not where is this Breaker Unit and how can it be tested?

Thank you
--
1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)





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