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Need help with 2006 C6Z06 Cluster Wiring

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Old 02-17-2016, 12:59 PM
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Racer
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Default Need help with 2006 C6Z06 Cluster Wiring

I'm replacing the dash cluster in my race only Z06 with the Racepak IQ3 dash.

The new dash doesn't provide the fuel reading.

Is there a way to splice into dash harness and connect the aftermarket fuel gauge?
Anyone has a wiring diagram for C6 cluster to find what wire to splice into?

Thanks
Old 02-17-2016, 02:26 PM
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schpenxel
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St. Jude Donor '15

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I'm almost sure the level senors don't directly connect to the cluster/gauges.. I'm not sure if they go to the BCM or ECM, but I'm able to adjust what the gauges read by changing things in the tune (ECM). The gauges are probably just adjusting based on what the ECM is telling them to read.

If someone else doesn't answer on what/where the wiring is I'll try to dig up where the fuel level senors connect to.
Old 02-17-2016, 02:56 PM
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That's what I'm looking for. The wire that goes from ECM or BCM to Dash Cluster.
Pinout diagram maybe.
Old 02-17-2016, 02:58 PM
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I'll try to dig it up but no promises
Old 02-17-2016, 03:11 PM
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I'm hoping someone else has access to (or knows how to find) better wiring diagrams. This is what I was able to dig up.. not sure it will be of any help. Lots of info but there's nothing concise about it.

Search for "Fuel level" throughout this document and you'll find some info on the wiring

Page 23, 25, 27, 47, 54 and 55 have some info on fuel level sensor wiring
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File Type: pdf
Fuel.pdf (1.79 MB, 728 views)
Old 02-17-2016, 03:14 PM
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Alright here's one that is a little better. The senders run to the ECM harness..

This one shows what pins they connect to at the ECM and also the resistance levels expected for different fuel levels..
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Fuel Level Engine Harness.pdf (384.9 KB, 392 views)
File Type: pdf
Fuel Level Specs.pdf (12.5 KB, 80 views)
Old 02-17-2016, 03:21 PM
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Kent1999
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Originally Posted by C6Racer
That's what I'm looking for. The wire that goes from ECM or BCM to Dash Cluster.
Pinout diagram maybe.
99.9% sure that the Fuel Level is *not* on a discrete wire, but is instead part of the C6's data bus network, coded along with other engine data. There is nothing in the cluster's X1/X2 connector pinouts that show anything for fuel level signal.

In other words, it is not just a simple wire you can locate, single out, and then jumper from the existing instrument panel harness to your new gas gauge.

As has been mentioned, it may be possible to find the sensor wire coming directly from the fuel tank, but there are *two*, one for each tank. And given the uneven way the tanks empty, using the signal from just *one* of the two sensors is guaranteed to be wrong, since I believe the fuel level is calculated in the ECM from the two sensor values.

Last edited by Kent1999; 02-17-2016 at 03:35 PM. Reason: removed incorrect BCM reference
Old 02-17-2016, 03:30 PM
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Each sender connects to ECM, the correct pin is in the pdf I posted

Last edited by schpenxel; 02-17-2016 at 03:30 PM.
Old 02-17-2016, 03:34 PM
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Originally Posted by schpenxel
Each sender connects to ECM, the correct pin is in the pdf I posted
Nice data... thanks for posting it. Confirms my recollection of the setup and the issue.
Old 02-17-2016, 04:16 PM
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Thanks for all the info.
If there is no wire to tap into to get the reading, any suggestion on how to connect the new Fuel Gauge?
Old 02-17-2016, 04:49 PM
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Just run a wire or two from the harness near the ECM over to wherever you need it
Old 02-17-2016, 06:39 PM
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Originally Posted by schpenxel
Just run a wire or two from the harness near the ECM over to wherever you need it
Yes. Which of the two wires you tap into will determine which of the C6's two fuel tanks (left or right) you want level info for -- each wire only gives data for 1 of the two tanks. And yes, the car empties the tanks one at a time... not both at once.
Old 02-17-2016, 08:33 PM
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If I had to pick one I'd just use the driver tank since it drains last
Old 02-17-2016, 09:01 PM
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Originally Posted by schpenxel
If I had to pick one I'd just use the driver tank since it drains last
Agreed. OP just has to keep in mind that the gauge will read "full" until the total amount of fuel is actually half consumed.

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