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I have limited resources, just a wiring diagram and test procedures.
I welcome the brainstorming and will try anything.
Terminal #16. We are talking about the same point. It comes from the ECM #33, correct? I agree with your interpretation except that I would say the duty cycle changes (frequency stays the same). I presume this signal has to do with the TCM dropping pressure in the tranny for smoother shift by control of line pressure solonoid on TCM terminals 4 and 5.
According to my info ECU and TCM "handshake" on 6 lines. I do not understand much about this exchange of signals with the exception of the B1 TPS. I did see level changes on B5 B6 B7 as it shifts gears but nothing on B16. Did not check B15.
TCM terminal:
B1 Throttle position signal passed through ECU from the TPS sensor.
B5 TCM reponse
B6 TC 1
B7 TC 2
B15 Gear position
B16 Engine Load
I will be checking engine load on B16 again with an analog meter to see if there is any change under driving conditions. I believe the analog meter will move slightly with a change in duty cycle. (Wish I had a scope).
Will measure manifold vacume at the "tree". Does the Motronic 1.8 monitor manifold vacume?
I have checked the throttle position sensor output voltage at the source and at term B1 above. It swings smoothly from about .5V at idle up to around 4V at full throttle, I presume that is normal. Have also measured it's resistance on the bench. Can't remember values but it changed smoothly. These measurements were done with digital and analog meters.
I will add one additional point but do not think it is relevent to the tranny issue. Engine idle is a bit lumpy due to a miss on #2. Smooths out as soon as throttle is opened. Compression, injectors, spark coils and plugs OK. Maybe front ignition module?
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David Hunter
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960 AW 30 transmission shifting- desperate and frustrated. [900][1993]