LLY Ficm

kidturbo

kidturbo

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No the Isuzu ficm needs ground fixed. Any ideas on that?

On the tcm's, just found a connector.. Will at least pull data and see if they talk.
dac01efcd705d7695be35effddaee6bf.jpg


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kidturbo

kidturbo

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How valuable is a LB7 "medium duty" chassis and engine harness before I hack this one up? It's had one of the control wires between the ECM and FICM replaced somewhere along it's life.

Also did the LB7 have VATS? Hope I don't need to burn a licese to disable it in this medium duty ECM.
 
2004LB7

2004LB7

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kidturbo said:
How valuable is a LB7 "medium duty" chassis and engine harness before I hack this one up? It's had one of the control wires between the ECM and FICM replaced somewhere along it's life.

Also did the LB7 have VATS? Hope I don't need to burn a licese to disable it in this medium duty ECM.
Click to expand...
Don't know about the medium duty but my LB7 had VATs
 
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1FastBrick

1FastBrick

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I wouldn't think it's that valuable but I didn't expect some of the used prices I have been seeing on some of this stuff either...

What's the alternative?
 
1FastBrick

1FastBrick

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kidturbo said:
Still searching for someone local with a running LB7 I can test that crank signal on.

For a quick bench setup, only need the ecm and ficm connectors. And a ecm with vats disabled.

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Just curious, I know your trying to shorten things up and simplify them. Does the other stuff not being used effect what your trying to do? Does it mess thing up electrically?
 
kidturbo

kidturbo

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With a few potentiometers on primary sensors, an apps, and some injector solenoid or resistors wired in, I've found they have no idea the rotating parts are missing.

Ya basically wire everything up, power the correct pins, and then adjust the sensor values using a scan tool. Then once ya add the crank/cam emulator signals, everything fires right up. Minus all the smoke, noise, and spinning fan blade..

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1FastBrick

1FastBrick

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kidturbo said:
With a few potentiometers on primary sensors, an apps, and some injector solenoid or resistors wired in, I've found they have no idea the rotating parts are missing.

Ya basically wire everything up, power the correct pins, and then adjust the sensor values using a scan tool. Then once ya add the crank/cam emulator signals, everything fires right up. Minus all the smoke, noise, and spinning fan blade..

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Click to expand...
So basically you have to cut the plugs off to hook up the potentiometers to act as sensors.
 
2004LB7

2004LB7

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1FastBrick said:
So basically you have to cut the plugs off to hook up the potentiometers to act as sensors.
Click to expand...
Have you looked at his twin boat thread? He did a similar setup for an LMM. It's basically fooling all the inputs to the ECM to make it think all the sensors are within range. Potentiometers are the easiest to use. Interestingly the ECM's appear to be happy accepting either a frequency based signal for the MAF like it does in stock form or just a variable voltage. So a simple resistor will give whatever airflow you want. If I'm not mistaken, everything else, ECT, fuel pressure, fuel temp, oil pressure, etc all use variable voltage so a simple potentiometer will work to replace any of those sensors.

Injectors are harder to trick. I did it before with an inductor as I couldn't find any resistors that would keep it out of limp mode. Had to try a handful of inductors before I found one that it liked. I think Ken just uses the actual coils from the injectors to keep it happy. Same for the fuel regulator
 
1FastBrick

1FastBrick

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2004LB7 said:
Have you looked at his twin boat thread? He did a similar setup for an LMM. It's basically fooling all the inputs to the ECM to make it think all the sensors are within range. Potentiometers are the easiest to use. Interestingly the ECM's appear to be happy accepting either a frequency based signal for the MAF like it does in stock form or just a variable voltage. So a simple resistor will give whatever airflow you want. If I'm not mistaken, everything else, ECT, fuel pressure, fuel temp, oil pressure, etc all use variable voltage so a simple potentiometer will work to replace any of those sensors.

Injectors are harder to trick. I did it before with an inductor as I couldn't find any resistors that would keep it out of limp mode. Had to try a handful of inductors before I found one that it liked. I think Ken just uses the actual coils from the injectors to keep it happy. Same for the fuel regulator
Click to expand...
Yes I have seen it. I am not an LB7 guy so to me the harness being cut up doesn't hurt my feelings. But other's might disagree.

Unfortunately with out a physical truck to get the data, his bench set up is the next best thing.

Looking at the prices of what some of these knuckle heads want for used stuff, I can see why he asked first.
 
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PureHybrid

PureHybrid

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2004LB7 said:
The only parts he needs local is the ECM, FICM and your injector solenoids. You can package them up and Tom can make then be local to Ken 😁
Click to expand...

Probably less time consuming to just send the whole truck!

I don't personally know anyone that has a scope, but if there's a member in the Zanesville area I'll have the truck until Friday at least
 
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kidturbo

kidturbo

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Also spoke to Andrew with the OG PPE boat last weekend. Since it's already in a box, and needs some medical attention, he's gonna ship me the first LLY stand alone harness hack job I ever did.

The medium duty LB7 harness I have is complete minus injector harness sections. To me it's scraps, but moment I chop it up, someone bound to say they'd gave me $1000 for it complete... lol

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darkness

darkness

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Verified no VATS. pic from the stock file. Hell, the medium duties don’t even have a bcm so…
 

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