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I am using a C5 LS1 in my conversion. I would like to use the C5 instrument cluster in the car.
I am not going to use the BCM. Before I start chopping up the dash I would like to make sure it is going to work.
For the fuel gauge. Can I just ran a wire from the cluster to the sender?
How many ohms does the sender need to be?
Is it possible to turn off the DIC errors for Traction Control, ABS, etc?
I looked up the wiring diagram in a Chilton manual available online through my local library.
It shows that the fuel gauge receives its signal from the PCM, with no details on what the signal looks like. So if you are using a C5 PCM, it might work.
Ir might be possible to turn off the other things by reprogramming, but I am not knowledgeable in this area.
Edit to add: It is unclear exactly what your conversion consists of. Keep in mind that the PCM is looking at the senders in two tanks, each apparently varying from 40 to 250 ohms, and it is looking for the right tank to empty first. Otherwise it will drive the gauge to zero and throw a code.
Last edited by wrmiles; Dec 11, 2021 at 03:23 PM.
Reason: Add info
The C5 has two fuel tanks with two fuel senders connected to the PCM as shown below .
Both signals are added in the PCM software to create the fuel gauge fuel level .The fuel level signal is sent from the PCM to the cluster on the serial databus
If one of senders get out of normal range the gauge could drop to zero level .
Each sender operate between 40 and 250 ohm (zero to full fuel level)
The C5 has two fuel tanks with two fuel senders connected to the PCM as shown below .
Both signals are added in the PCM software to create the fuel gauge fuel level .The fuel level signal is sent from the PCM to the cluster on the serial databus
If one of senders get out of normal range the gauge could drop to zero level .
Each sender operate between 40 and 250 ohm (zero to full fuel level)
So what I am seeing is if I install two senders in the tank hook one to C2 54 and the other to C2 73 the gauge should work.
Now I just have to figure out how to fool the DIC to think everything is okay.
Is there some way to fool it into thinking everything is okay? Is it looking for a specific voltage or is it more of a canbus signal that the BCM is sending it?
Is there some way to fool it into thinking everything is okay? Is it looking for a specific voltage or is it more of a canbus signal that the BCM is sending it?
Answering this is beyond my knowledge-BUT-If you're going to run the instrument panel, and PCM, why not run the C5 BCM? Seems logical. It takes up little space, and you'd have, I think, a lot better shot at getting what you're looking to do. I'll give you the phone# of someone who'll probably have an answer for you, either way, and they also make wiring harnesses for about anything. VERY knowledgeable, as the owner is Bill Howell, a retired GM electrical engineer. Call Howell Engine Developments@(810) 765-5100, and ask for Troy, or Bill jr.. I'm sure they can help you, or send you to someone who can. Best of luck......
"So what I am seeing is if I install two senders in the tank hook one to C2 54 and the other to C2 73 the gauge should work."
The PCM expect the fuel level (voltage) to drop in the passenger side first until empty level and then the fuellevel (voltage ) in the driverside tank starts to drop untill both fueltank to empty .
If these two fuelsenders voltage levels does not drops correct it will probably set several fuel level sensor performance DTC's
C5 instrument cluster questions
