Corrado g60 turbo
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VW Passat
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Audi S2
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Trigger tester tests
4-9-2007
- We tested the trig2 (sj7 open) and it seams to work well using *a 100k-resister pull-up to 5V.
- Shorted sj7 and pull-up r48 still ok
- How can the trigger 2 work when the hall is pulling the ref *pulse down (see image 3) ?
- what is the correct working sequence for Audi trigger? And what *will the signal to the processor look like if using crank home and *hall signal
- Can Vems use the original trigger trimming (inverted home trig. *Of curse) or due I have to adjust the distributor to make it *work?
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- on EC36 pin 13 0-4V +- pulse
- measured 0-4 V before R91 => good
- +- 0,1V after R91 => NOT GOOD
- this is indeed a showstopper for sectrig HALL.
- maybe R91 is cracked ? measure Ohm
- most likely the trace is "shorted" to ground with low resistance. Look for places
- It seems you replaced C33 yourself, check if shorted there.
- Also see D27 (maybe shorted or reversed ?)
- and SJ7 at the bottom, almost under the FETs can be opened to see if the sectrig LM1815 pulls the signal to ground for some reason
- Leaving the sj7 open then i have 0-4 V to the processor. Removed the lm 1815 and still ok signal
- if you purchased bare board, and assembled yourself, this part was not tested with the mintest. So it is even possible there is a short somewhere on the PCB traces
- if you have problems to find the short, while the board is powered, you can use a 0.5 .. +5V strong supply (100mA or higher) to inject current into the short, and measure with DVM mV mode to locate the short. Don't use +12V (or anything higher than 5V), that would kill components. Be careful. If you have max +0.7V supply, or limit with a resistor and diode, you can do the measurements with the board unpowered.
Image2. Measurements with exchange crank home trigger
Image 3. Measurements with exchange crank home trigger
Added a 20K resistor (12..15k is better, sometimes 20k is too high)
Soldered JP7
Mounting the stepper chip
C103 replace with 1nF (only needed on certain boards from a given old batch, 2005 or so)
added 1uF cap in parallel with C40
R182 shorted
Made wire for the crankhome-VR trigger input (EC18 pin 12)
Connected JP 2 and JP 7 so the primary trigger goes where it needs to:
