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The following resources have been obtained while installing VEMS on Toyota 4A-GE 16V & 20V engines. VehicleFitment/Toyota/Injectors VehicleFitment/Toyota/Triggers VehicleFitment/Toyota/Sensors VehicleFitment/Toyota/IdleAirController ----- After the previous work using pull-down resistors we moved onto the suggested 10k->12V pull-up resistors and the addition of a 220nF cap on top of C40. Still not good, the latest trigger log shows some strange missing tooth issues: http://vems.hu/www.vems.co.uk/VEMSTrigger/4AGETrigger3.txt Action to try next: # Try to match the OEM pull-up of 0.6V with smaller value resitors. # Try pull-down resistors as before, but with LM1815 pin5 jumpered to cause LM1815 to ignore any voltage below 200-450mV # Use a seperate ground feed direct to the LM1815 chip. ----- Toyota 24+4 Trace: http://vems.hu/www.vems.co.uk/VEMSTrigger/24+4.PNG Recorded with USB Instruments Stingray * Testing on the bench with: Recorded trigger as a wav works okay, testing distributor driven by a motor works fine. * Testing with the trigger in the car through the loom does not give an RPM reading. ** so the amplitude is too small, or the pullup too strong ** DC voltage measurement ? ** AC voltage measurement ? ** RPM ? Cranking ? or somehow running engine (with alien ECU) ? '''Config & Tables''' http://vems.hu/www.vems.co.uk/VEMSTrigger/config.txt http://vems.hu/www.vems.co.uk/VEMSTrigger/tables.txt '''Connection Details''' The Ne (24tooth) trigger is connected to Trig1, the G1 (4 tooth) trigger is connected to Trig2. The G- combined ground connects to the common grounds. Two 270Ohm resistors pull the signal down to ground. '''Trigger Logs''' Initial test: http://vems.hu/www.vems.co.uk/VEMSTrigger/24+4InCarTrig.txt Test with the Ne and G1 trigger inputs changed over Ge to primary trigger, Ne to secondary trigger - we were out of clues so we thought we'd try it... http://vems.hu/www.vems.co.uk/VEMSTrigger/24+4AfterSwapTrig.txt Changing back to the correct trigger connections but removing the pull-down resistors. http://vems.hu/www.vems.co.uk/VEMSTrigger/24+4FinalMiseryTrig.txt A log from the bench test http://vems.hu/www.vems.co.uk/VEMSTrigger/24+4BenchLog.txt The owner of the car has produced a spreadsheet to try and analyse the trigger logs: http://vems.hu/www.vems.co.uk/VEMSTrigger/24+4waveformsgraphed.xls Toyota 24+4 Distributor: http://i81.photobucket.com/albums/j209/JMR_AW11/Ign6.jpg '''#10''' is the injector signal - indicating 1 injection event every two ignition events. Divider=02 means injection event every second ignition event. Good if you have 2 injectors hardwired in parallel. (or, even than, you can (at the cost of a few wasted cycles) do something like: h[0]=00 02 00 01 .. .. .. ..
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