test bench

[ericjon262]

does anyone have instructions on how to make a PCM test bench? I'm not meaning a benchtop flasher, but somthing that allows you to test the inputs and outputs after changing code parameters?

Thanks-

Eric

[Six_Shooter]

You can do it the same way that many of us OBD1 tuners have.

Search for Test Bench on this site's forum and you will find a thread on it. I use a JimStim in my set-up, and can be used for OBDII PCMs with some different set-up.

[RobertISaar]

i still need to post pics and specs of my rig..... but i also need to rebuild it. something inside is tripping my ATX power supply's auto-shutdown due to excessive current at random. there shouldn't be anything "bare" in there, let alone without circuit protection against something like that.

[ericjon262]

the jim stim seems like it should work, but I need to figure out how hard it would be to reprogram for another wheel. I also didn't see cam position sensor support (mind you, I only skimmed it over). Robertsaar, I'd love to see how your bench works. I'm always open to more ideas.

[Six_Shooter]

the jim stim seems like it should work, but I need to figure out how hard it would be to reprogram for another wheel. I also didn't see cam position sensor support (mind you, I only skimmed it over). Robertsaar, I'd love to see how your bench works. I'm always open to more ideas.

It's pre-programmed for a bunch of different trigger wheels, up to 80 now IIRC.

There is a secondary trigger that I believe is used to simulate the cam signal.

[RobertISaar]

Robertsaar, I'd love to see how your bench works. I'm always open to more ideas.

mine is built relatively simple compared to some of the jimstim functions, especially the trigger wheel emulation.

[ericjon262]

I'm starting to think about getting a jimstim more, they're pretty cheap and should be able to do what I need it to do.

[EagleMark]

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?9-ECM-Test-Bench

[ericjon262]

You can do it the same way that many of us OBD1 tuners have.

Search for Test Bench on this site's forum and you will find a thread on it. I use a JimStim in my set-up, and can be used for OBDII PCMs with some different set-up.

do you have any setup instructions for obd2?

[EagleMark]

Never seen instructions other then what is available from JimStim? Just kind of build it one circut at a time to work? There is also a Trans stim that I always wanted to add...

[ericjon262]

Never seen instructions other then what is available from JimStim? Just kind of build it one circut at a time to work? There is also a Trans stim that I always wanted to add...


You can do it the same way that many of us OBD1 tuners have.

Search for Test Bench on this site's forum and you will find a thread on it. I use a JimStim in my set-up, and can be used for OBDII PCMs with some different set-up.

my last comment was in reference to the bold text above.

[Six_Shooter]

You would have to match the RPM/ crank trigger wheel type.

[ericjon262]

You would have to match the RPM/ crank trigger wheel type.

oh, so you're just refering to the basic setup has to match the wheel being used? that would make sense.

[ericjon262]

well, bump from the stone age! I bought a jimstim and put it together, it was easier then I expected, now I just need to set this bugger up, and get a PCM to play with, and start seeing whats going on....

[ericjon262]

I was thinking about this over the past few days, and I realized that the jimstim won't quite meet my needs, as it only allows for 2 signals to be generated, and my application uses three signals, 2 crank, and one cam. any ideas for a fix? I thought about trying to piggyback 2 jimstims together, but then there isn't a way to synchronize them.

any ideas?

[RobertISaar]

depends on when you need a signal to happen....

you could do something as simple as a decade counter, when a signal happens 6 times, on the 6th signal, one new signal happens, like a cam sensor on a V6....

something like that? depending on how tightly the OS was written, it might not set off any DTCs due to a cam signal happening at the correct rate, but at the wrong "phase" in engine rotation.

[ericjon262]

depends on when you need a signal to happen....

you could do something as simple as a decade counter, when a signal happens 6 times, on the 6th signal, one new signal happens, like a cam sensor on a V6....

something like that? depending on how tightly the OS was written, it might not set off any DTCs due to a cam signal happening at the correct rate, but at the wrong "phase" in engine rotation.

That might work, I might just have to do a "CASE" learn on the test bench. which shouldn't be too big of a deal.