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'''Heavily modified/rebuilt 5cyl AAN engine 2.5L, 60-2 HALL setup''' Custom made flywheel, factory (VR+Auditrigger) flywheel not present. Some [http://vems.hu/vemstune/bugreports/reports.php?cmd=view&key=aNg0Ch#comments file attachments]. 5cyl 60-2 is very common in Audi-s and Volvos. Usually install is smooth. HALL sensor seems to have failed in this case, after some successful starts. HALL sensors are very reliable nowadays. When they fail, usually some serious circumstance cause them to fail. '''It is strongly suspected that insufficient engine ground damaged primtrig HALL sensor'''. (The exhaust workshop removed engine ground, and not informed the builders ?) ---- '''Primary Trigger ''' Current stage: failed HALL sensor Expensive VAG (partnr?) ... HALL sensor was fitted on crankshaft (not the more usual cheaper aftermarket sensor). Original harness was modified for sensor pinout, to have +5V at proper place (so the HALL sensor was not connected with wrong polarity even for a second... But insufficient engine ground might have caused problem) Changed the original RPM sensor's pinout for the new sensor follows: * pin1=+5V EC36/28 * pin2=signal EC36/27 * pin3=GND EC36/26 During (not very systematic) attempts had some tendency to work * was the triggerlog good with primtrig=falling ? (when capturing HALL trigger, please add primtrig_falling or primtrig_rising in the filename for later ref) for some time (engine even started at one point), but than it deteriorated RPM=10 (config problem was suspected => random attempts without wiki page and without taking notes => hard to follow and clearly insufficient for support) now primtrig HALL pulls output to 0V all the time, '''HALL sensor seems to have failed''' '''Primtrig HALL DVM and scope measurements will follow.''' Remember to use 2k7 .. 4k7 pullup resistor to +5V if sensor is not connected to VEMS. Without any pullup resistor the sensor output will most likely will be 0V, without any information. ---- Trigger config See [http://vems.hu/vt/help/v3/v3_primary_trigger_settings.html FTT] and note that 10 or 11 is not good (nor is it needed or appropriate) for first trigger tooth in this 5 cyl 60-2 setup.
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