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 [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 [ 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!
- 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?
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.
Contact: chris atbutnossppam kendallengineering.com