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What about the VVT solinoids? if the hubs are good, wiring fixed, thats my next guess as I had the same issue with my 08 in the past. What do you think Don and OldBlue ??
Ok, the update as we finally had time to dig into the car today. The issue is centered on the ABS control module. No signal being sent to that wheel. So.. used units coming in as the control modules are NLA from Chevy. Problem is that this is the second module in a year. It was brand new January last year. I'm wondering if the change out to the disc rear axle had anything to do with it. We did try the SS module and pump (new) but the module would not pair with the car BCM (?). We put the stock drum/disc module and pump in and everything was fine. But I wonder if this strains something within that system. Either way, I'm going to have a spare, actually two, and am going to send both of those out for refurbishment.
You never gave the full code. Multiple EBCM failures would make me think connectors; bent pins, pin pushed out the back, funky crimps etc. Very few failed EBCMs reported here.
I am a bit confused; the description in the book says:
But the wiring diagram shows Low Ref and Signal are the 2 wires. Low Ref is usually 0 - 3.3 V, mostly 0 volts because it is easier to do.
Dunno, Don, I'm not a mechanic. He tested the front hubs individually for a generated square wave by spinning the opposing wheel with the hubs disconnected from the system. Each produced an even wave and amplitude. He then resistance tested the wires up to the connector on the ECBM with the hubs disconnected, and those passed. Which leaves the ECBM as a failure point. To test that theory, we did a short test drive with he in the passenger seat with the scan tool receiving off the OBD port, and he said that the left hub wasn't "getting a signal". What he meant by that I don't know - I wasn't holding or looking at the scanner. So, we'll see what the used part will do. Reading through several pages of people who refurbish these things it seems that every manufacturer has issues with ECBM's, but Chevy seems to lead the pack, especially in the 1500 series pickups, Tahoes and mid size cars. Even the guy I bought the used units from said he sells quite a few.
Dunno.. if I was more of an electrical nerd I might dig a little deeper and try to figure it out.
the wiring diagram shows Low Ref and Signal are the 2 wires. Low Ref is usually 0 - 3.3 V, mostly 0 volts because it is easier to do.
I’m not saying that’s wrong but could you clarify why you think that’s inconsistent? I think if the sensor just alternates from low to high resistance, the voltage at the wire on the left will alternate two values, which will depend on the two resistance values of the sensor, and the value of the resistor on the bottom left.I’m assuming the that there’s 12V on the other side of that resistor, and that would be the 12V to which the description refers. That seems consistent with the description.
I think that ground needs to be checked along its entire length, maybe just make sure the resistance is very low between the pin and the frame.
Last edited by PulpFriction; Dec 17, 2022 at 09:58 AM.
I do know for the disc brake conversion, the rear hubs from the SS don’t work with the LS/LT , you have to use the LS/LT hubs , different signal voltage. The statement you make about the left front hub not getting signal is telling me , that is the issue, a bad hub? Bent pins in the connections? A break in the harness? A problem with the EBCM itself?
Seems like that’s the issue if the mechanic checked and verified the harness is good, the hub is good and he has confirmed the problem is the EBCM .
Did you change the hub from left side to right side to confirm that the problem remains on the left side?
I do know for the disc brake conversion, the rear hubs from the SS don’t work with the LS/LT , you have to use the LS/LT hubs , different signal voltage
Did you change the hub from left side to right side to confirm that the problem remains on the left side?
Now that is something I didn't know with the rear hubs. I'm 95% sure we didn't change those when I did the swap, and I've never had a signal issue from the rear. But, maybe that's causing all the other issues with the electronics? I don't know. We did not swap the hubs, but I'll mention that when it goes back in. Good thought for a final check.
All of that testing does not rule out connector pins.
Low Ref is not exactly the same as analog ground. I would think if the EBCM was not providing it to 1 wheel it would not be providing to any wheel.
All of that testing does not rule out connector pins.
Low Ref is not exactly the same as analog ground. I would think if the EBCM was not providing it to 1 wheel it would not be providing to any wheel.
Could be. But considering that I have the error initially with the broken wire at the hub side, and continue to have it with the replacement intermediate harness wire seems to rule out a misplaced pin. But, I'll check all the connections again when we get back into it.
