Versatile Engine Management Systems - VEMS wiki

Trigger setup for Audi S4, 5cyl Direct Fire engine

Audi 2,2T AAN engine

Now with orginal trigger

ECM: 3.3 #332

Modified to accept auditrigger

Scope messurements are done at ~200rpm

• added lm1815
• added 100k resistor at R182
• added wire, ec18pin12 to R90
  • measure at lm1815 pin3 that this signal comes through (with scope)
  • [Pic] I think this signal is inverted, try change polarity. The interference between the triggerpulses, can you zoom in and tell if it is from the crank teeth or just normal noise? Noise is from primary trigger /Emil_M
  • [Pic_2]
• added blob at SJ7
  • also scope here to see the signal mix from distributor and sec lm1815 output.
  • [Pic]
  • This picture is over longer duration, peak is when i hit startbutton[Pic]

also try to take a log with distributor unplugged, you should see 0x0A for each secondary trigger

• Signal at G28 (crankteeth) [Pic]
• Signal at G4 (crank home) [Pic]
• Signal at Hall [Pic]

All sensors original except for map/iat: Bosch 0 281 002 437

Firmware 1.0.29 00:21

Config http://linkopingsmotorsport.se/1029/config.txt

Tables http://linkopingsmotorsport.se/1029/tables.txt

It turned out that the 135 tooth noise to the crankhome is inserted outside the ECM (with connector removed, it was still there), in the cable or ground.

Even if it might idle after some hacks, finally the noise from crank-VR must be eliminated, hints on InputTrigger/AudiTrigger/TestLM

It's unacceptable to use

• shared (between crankhome and 135 tooth crank)
• or nonshielded
• or badly shielded (eg both ends!) cable
• or bad ground

with this setup

There is a problem under investigation: the LM1815pin3 is clamped at 0V (not at -0.3V) for some reason. Take pics, measure voltages on LM1815 pins. (supply too).

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MembersPage/EmilMalmsten/AudiS/OldPage with 60-2 + camsync. Had runout and very little space to fix triggerwheel

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See also

• MembersPage/EmilMalmsten

Document last modified 2006-01-02 23:24:54

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