no crank signal

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Matt Cramer
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Re: no crank signal

Post by Matt Cramer »

Would trying a Ford VR sensor be an option? I think this wheel may be too narrow for your sensor. There have been a few sensors we've tried, such as LS1 sensors, that would not get a good read on this wheel.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
red
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Re: no crank signal

Post by red »

Well about finished with this project after making a thicker tooth wheel today with absolutely no difference to the tooth logger readings.Tried with straight battery 12 volt to sensor and pull up resistor. Pretty certain at this stage that it isn't anything on my side as i know this setup has worked in the past. Just how or what the ecu is doing with the signal is for somebody else to figure but for now its going back to carby. No point attaching another data log as it is exactly the same as before with a few spikes and then nothing.
Matt Cramer
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Re: no crank signal

Post by Matt Cramer »

Is the shell it's next to steel or aluminum?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
DaveEFI
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Re: no crank signal

Post by DaveEFI »

red wrote:Well about finished with this project after making a thicker tooth wheel today with absolutely no difference to the tooth logger readings.Tried with straight battery 12 volt to sensor and pull up resistor. Pretty certain at this stage that it isn't anything on my side as i know this setup has worked in the past. Just how or what the ecu is doing with the signal is for somebody else to figure but for now its going back to carby. No point attaching another data log as it is exactly the same as before with a few spikes and then nothing.
My first approach would be to look at the signal going into the VR input at Tach Select and the one coming out of the VR circuit to the processor at Tsel with a 'scope. That's where most of these sort of problems are.
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thieledj
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Re: no crank signal

Post by thieledj »

Can the VR sensor pots be adjusted on the MS3 Pro the same as you can on the MS2-Extra?
grom_e30
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Re: no crank signal

Post by grom_e30 »

the ms3 pro uses a different vr setupand it has no adjustment pots it a max992x ic same as what's in the microsquirt v3.
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
jsmcortina
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Re: no crank signal

Post by jsmcortina »

With the ECU powered up and turning the engine by hand, is the signal wire voltage going from 0-12V as teeth pass ?

James
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red
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Re: no crank signal

Post by red »

Yes
jsmcortina
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Re: no crank signal

Post by jsmcortina »

Good that it works there.
Go to Project Properties - Settings in TunerStudio and enable Port Status.
On the dash, right click and reload.

Look at the indicator called PORTT0 - this is the crank signal input. It must follow the crank sensor state. (I think it will be inverted but that's ok.)

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
red
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Re: no crank signal

Post by red »

Thanks for that reply James. I will be away fer a few days but will have a look at that when i am back.Also i will be able to do a decent log with the engine running on carby and may be able to figure something there.
grom_e30
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Re: no crank signal

Post by grom_e30 »

Matt Cramer wrote:Is the shell it's next to steel or aluminum?
I was wondering the same thing if thats a big chunk of steel behind the toothed wheel may cause the sensor issues.
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
red
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Re: no crank signal

Post by red »

Have set up a test wheel on a drill away from all metal and same result
billr
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Re: no crank signal

Post by billr »

Is that test setup with the trigger wheel attached to a dampener, same as shown in the picture? It doesn't look like the wheel teeth protrude above the dampener much. However, that may be a moot point, since you have already verified that the sensor output "toggles" when you turn the crank by hand. Just trying to think it out...
red
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Re: no crank signal

Post by red »

The test was completely off the engine
red
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Re: no crank signal

Post by red »

Managed to get some headway on this today by using a vr sensor. Is it going to do the job at 7500 rpm on a 36-1 tooth wheel?
Managed to get engine started and idle fine with it.
I have a pressure gauge reading backwards, will reversing the wires do anything?
jsmcortina
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Re: no crank signal

Post by jsmcortina »

Generally VR sensors are more stable at higher RPMs than hall effect sensors. I recently worked on an install using the factory 60-2 and VR sensor at over 8000RPM

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
red
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Re: no crank signal

Post by red »

Wow. It sounds like it will do the trick then. What about the gauge readings?
I will do a log today and post it tonight
grom_e30
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Re: no crank signal

Post by grom_e30 »

Have you got the sensor calibration for the oil pressure sensor correct because in the msq at the start of this thread its set to use the gm temp sensor calibration.
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
red
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Joined: Sun Dec 07, 2014 2:11 pm

Re: no crank signal

Post by red »

Its a gm sensor from diy and i used the gm calibration.--But i will re check
jsmcortina
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Re: no crank signal

Post by jsmcortina »

red wrote:Its a gm sensor from diy and i used the gm calibration.--But i will re check
"GM calibration" means GM temperature sensor calibration. That will be wrong for any normal linear pressure sensor.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
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