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Summary of change:
TVR Cerbera fitted with AMG M113.980 v8 engine 5500cc. ECU: VEMS 3.6. Firmware 1.1.96 '''Are you still using 1.1.96 ?''' * any specific reason ? * note that is not supported (1.2.31 or newer is supported; older, that was supported years ago continues to work if set up correctly, but tech crew will, in general not waste time to investigate setup with old fw after much newer+better fw has been available for years). '''Sensors:''' * MAP: vems internal sensor. * IAT: as sold on vems website. * Coolant: bosch * TPS: nissan * Lambda: 1x bosch wideband * Trigger: Bosch VR part number 0241210171 ** no shield on wire. using original engine loom. ---- '''Sectrig:''' * ECU was configured factory sectrig=VR ** home-conversion to sectrig=HALL was attempted, but '''NOT GOOD YET''' * measured 0.37 volts on EC36/17 HALL input when nothing connected ** that is too low ! Should be 3.7V or higher (min 3.0V, realy !) at EC36/13 (or the CPU side of SJ7) * '''REMOVE THE WIRE EC36/13 to the board''', that goes to the 10k before LM1815/pin3 * see the v3.6 sectrig=HALL on GenBoard/Manual/InputTriggerHardWare (v3.6 == v3.7) Bosch Hall HA-P2 part number 0232103111, no shield on wire. '''Sectrig working well after following above page.''' ---- Ignition: -8 x coils direct drive from ECU Bosch twin single fire coil 2x1 part number 0221503035 2k ohm in plug leads. all on seperate channels from ecu ---- '''Injectors: ''' * 8 x Standard Bosch for this engine ** '''high impedence 13ohms.''' ** '''all on seperate channels from ecu.''' ---- '''HELP! 2 injector channels are shorted to GND''' * care to tell us '''which 2 ?''' ** any relation between them ? Neighbors somehow ? (ahh, same FETdriver, see below) Have the injectors failed ? (write measured injector resistance of injectors 1-5-4-2-6-3-7-8 here: ) * injector on all the time, as soon as you power up ecu ** is EC36/23 flyback connected properly (to injector+ of all injectors ?) ** with ECU disconnected; DVM in diode mode, measure between problematic injout (red) and EC36/5 GND (black). Shorted ? What is the mV reading ? Less than 900mV ? ** what if you do NOT power up the ECU, but power up the injector +12V (EC36/23) ? Are the 2 ECU outputs activated (pulled down to GND ?) Tested board, '''both injector transistors go back to the same FETdriver chip'''. How can I repair this? * before repairing (measuring FET gate and finding out if FETdriver is damaged or FET or both) ** most likely FET gate is continuosly high because of damaged [https://shop.vems.hu/catalog/injector-only-p-59.html inverting FETdriver] MC33151D (or VD) or TC4426EOA (or AEOE) are good replacements ** IMPORTANT: please try to find out what caused the damage. The FETdrivers + FETs together easily drive 8..10A (you drive 1A) for decades if the ECU is installed properly. ** '''ANY SIGN THAT ALTERNATOR regulation failed, resulting in voltage spike(s)? ''' *** Battery "kill switch" ever used while ECU powered up ? *** Or welding (or other electric shock) ? *** Or ECU disconnected while powered up ? *** These come to mind first if any FETdriver is damaged (FETdrivers bare 200kHz for decades, 200 Hz is ridiculous low freq for them. BTW PWM-ing not accidentally enabled in config ? 25.5 msec and injpwm=100% ?). ** See GenBoard/Manual/GroundConnections ** or EC36/23 flyback was NOT connected ? ** Can you '''carefully''' read [http://www.vems.hu/download/v3/doc/ Rescuekit.pdf] and check (visually + measurements) all you can (so at least he very basics install rules are followed). * it is easy to replace FET, or FETdriver, but only makes sense if the setup is fixed to avoid repeating damage ** Is a 18V (big 1,5KE18 ) unidir transient diode connected onboard ECU ( anode = GND and cathode = +12V ) ? ** Is a 1A (or max 3A) fuse installed for ECU ? ---- Outputs: -Fuel pump relay -cooling fan relay -IAC Bosch double solenoid. running on stepper outputs. Timing: Crank trigger 60-2. Missing tooth at 65 deg btdc. Firing order 1-5-4-2-6-3-7-8 Binary code for knock based on firing order: 10110100 (that is 0xb4 , or decimal: 180 ), but if your ignout array does not start with the ignout for cyl1, that needs to be bitwise rotated before using as knock_chan value. * note: if you publish vemscfg or vemslog, we can help, but even the vemscfg (h[2]=... line) or vemslog is not enough to surely tell that, unless the real cylinder numbering - available in new VT for 1.2.x fw - is filled out properly. Just in case, specify ignout - cyl mapping here: * cyl1 EC36/.. * cyl5 EC36/.. * ...should be on cfg file. **I have now done '''over 10000km with this cfg on the road!''' the only things I have noticed is that on average every 1000km it will stumble for a second losing power, similar to plugging in the laptop on the move. not sure why this happens? **overrun fuel cut software can cause odd issues so have disabled. Not to worried about that though. **Cranking seems to take a while before it actually starts. looking at trigger log file (also on the link) you can see both triggers but fuel/ignition takes a while to cut in? https://drive.google.com/folderview?id=0B1bD3kJOFhgZcUJoV3d5bXpETm8&usp=sharing TODO: Knock settings. Runing 2 bosch twin wire sensors. no shield on cable to GND. one wire from each goes to EC18/1 and EC18/2 and both are grounded to EC18/17. is this ok? main problem is software settings, what do i put for (knock chan)? no help menu on vems tune for this. all other input values make sence. many thanks. Need to run 16 ignition coils. 8 pairs, twin spark configuration. I have been just using one of the spark plugs which works OK but no good for emissions @mot! * coils draw 7.5 amps (peak ?) ** Can I run 2 per IGBT ? ** IGBT-s are able to drive 15A peak (this also depends on dwell time: RMS average should be 10A max) if cooled properly (but the cooling is well tested and proven for 7A RMS, 10A peak) ** 2 IGBT driven from the same gate signal is also possible (source is also same: = power GND) * Will the rest of the ecu be OK? ** yes Contact: chris atbutnossppam kendallengineering.com
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