Ok. Is this where I would take the batteries to say Autozone and they put them on their machine?
Possibly a Bad ECM?
- Thread starter Daryl LBZ
- Start date
Ok. Is this where I would take the batteries to say Autozone and they put them on their machine?
I think they could do it. Remember to test both batteries separately. Here are some other options.
I have this one and it works good.
www.harborfreight.com
I have this one and it works good.
100 Amp, 6/12V Battery Load Tester
Amazing deals on this 100 Amp 6/12V Battery Load Tester at Harbor Freight. Quality tools & low prices.
I think they could do it. Remember to test both batteries separately. Here are some other options.
I have this one and it works good.
100 Amp, 6/12V Battery Load Tester
Amazing deals on this 100 Amp 6/12V Battery Load Tester at Harbor Freight. Quality tools & low prices.
Thank you! Appreciate it!
I'll have to look and see what SP205 is for on the 06 LBZ .. if it's a class 2 splicepack, then it should not have an impact on the engine running, other than possibly theft deterrent type comms with the BCM. A problem on the class 2 bus shouldn't take down the CAN/GMLAN bus.
I didn't note if you have efilive, but if you do, you could flash a VATS disabled tune in and see if it starts then... If it does start and run, then it could be a class 2 issue preventing theft deterrent comms... I can't see rooting around in the doors changing mirrors affecting much else beyond the class 2 bus...
You would need them both. That will set you back ~$600 or so with shipping. You have the LLY harness shown but the post is for an LBZ, I linked the proper LBZ harness below instead.
BenchForce PowerBlock Starter Kit for Automotive OBD-II
This BenchForce PowerBlock Starter Kit for Automotive OBD-II includes a Storage Case, Protective EVA Soft Case, PowerBlock II 12V Switch Assembly, and more.
bench-force.com
Engine Control Module Bench Harness 06-10 GM E35 6.6L
VEHICLE DETAILS MAKES: Chevrolet, GMC MODELS: Express, Kodiak, Savana, Sierra, Silverado, Topkick YEARS: 2006-2010 ENGINES: 6.6L MODULE: Engine Module USAGE: ALIASES: E35 LBZ, LMM Duramax SUPPORTED COMMUNICATION PROTOCOL(S) DLC PIN(S) CAN BUS 16 WAY OBD-II DLC PINS 6 & 14...
bench-force.com
You would need them both. That will set you back ~$600 or so with shipping. You have the LLY harness shown but the post is for an LBZ, I linked the proper LBZ harness below instead.
BenchForce PowerBlock Starter Kit for Automotive OBD-II
This BenchForce PowerBlock Starter Kit for Automotive OBD-II includes a Storage Case, Protective EVA Soft Case, PowerBlock II 12V Switch Assembly, and more.Engine Control Module Bench Harness 06-10 GM E35 6.6L
VEHICLE DETAILS MAKES: Chevrolet, GMC MODELS: Express, Kodiak, Savana, Sierra, Silverado, Topkick YEARS: 2006-2010 ENGINES: 6.6L MODULE: Engine Module USAGE: ALIASES: E35 LBZ, LMM Duramax SUPPORTED COMMUNICATION PROTOCOL(S) DLC PIN(S) CAN BUS 16 WAY OBD-II DLC PINS 6 & 14...
Thank you! I contacted the seller on eBay that was mentioned in a previous post and he does not have anything that will work for an LBZ ECM. I'm going to trouble shoot some more this weekend, and I will probably end up taking you up on your offer if your don't mind.
Just shoot me a PM and I will get you my address, no worries at all. I can help source a replacement if the time comes and update/program to your VIN.
I haven't gotten anywhere further yet. I had to do some regular maintenance to two of my other vehicles over the weekend first. I went out yesterday to load test my batteries and the one was about dead, and the other was at about 50%. So, I didn't even bother troubleshooting yet until the batteries are charged up. I plan on load testing the batteries and doing more troubleshooting after work on probably Wednesday night.
Performed the load test on both batteries (separately) last night. They both came out as being good. I'm still checking over some things yet.
UPDATE:
I decided to get my multimeter out and check all the pins in Splice Pack 205 (SP205). So with the comb pulled out of SP205 I'm getting 7.53v on pin B (ECM) and 5.95v on pin K (Generator Battery Control Module Class 2 Serial Data) which indicates a data link high condition from what I remember. If I remember correctly that indicates that either a module is bad and is constantly sending a signal, or a wire is messed up. Now when I unplug the ECM I obviously get no volt reading on pin B, but I still get the same 5.95v reading for pin K. Any idea what exactly pin K is for or what it does? Any idea if this is related to the ECM issues as well?
I decided to get my multimeter out and check all the pins in Splice Pack 205 (SP205). So with the comb pulled out of SP205 I'm getting 7.53v on pin B (ECM) and 5.95v on pin K (Generator Battery Control Module Class 2 Serial Data) which indicates a data link high condition from what I remember. If I remember correctly that indicates that either a module is bad and is constantly sending a signal, or a wire is messed up. Now when I unplug the ECM I obviously get no volt reading on pin B, but I still get the same 5.95v reading for pin K. Any idea what exactly pin K is for or what it does? Any idea if this is related to the ECM issues as well?
The pins I'm probing with the multimeter are in Splice Pack 205 which is located under the dash.
Ah. Sounded like you were probing the ECM connector. But miss read what you probed
I will try that tomorrow. The Generator Battery Control Module is throwing me off though. I would like to know why it has a high voltage signal as well.
I'm not familiar with this generator battery control module. As far as I know, the ECM controls the alternator directly. It sends the signal to the regulator on the alternator to turn it on and off
That is what I'm reading as well. It just doesn't sit well with me ruling the issue to be with my ECM only whenever I'm getting a high voltage reading for generator control module as well. Unless this is normal then that would explain it obviously.
Ok so I did some more digging tonight and I found that I was looking at this wrong when it comes to pin K. So pin K can be three different things depending on the truck you have according to the wiring diagrams I have. Three different things also means three different wire colors. So for the Generator Battery Control Module the wire color at pin K would be Orange & Black. My truck doesn't have that obviously so it's not that option. I have a YELLOW wire which is for Allison Class 2 Serial Data.
So after finding this out I decided to unplug the TCM and recheck the voltage on pin K with my multimeter, and as I suspected I now have no voltage at the pin any longer. I then decide to plug my ECM back in and check the voltage for it at pin B. After rechecking I found that it is still putting out 7.53v which is WAY over what it should be.
So it appears that there is a problem with BOTH the ECM & TCM which seems very odd to me. They are both putting out high voltage at their respective pins in Splice Pack 205 which indicates a short to power. So that supposedly means that either the modules are bad, or a wire is rubbed through somewhere. Where that would be I have no idea, but it seems like I'm going to have to dig deeper into the wiring harness, pins, etc to make sure the wiring is ok. What a mess!
Ok so I wanted to post an update in case someone else out there has a similar problem some day. So long story short, after being too busy to really dig into this thing really deep for a few months I've finally found the answer. Turns out it was just a loose ground wire bolt on the passenger side of the engine block. I had been over all of the grounds when I put this truck back together, so I sort of pushed that to the back burner as a possible issue. What threw me off was that the truck had ran and drove fine until the day it just decided to stop running. So obviously at some point the bolt backed out causing the ground to become loose. Thankfully I didn't spend any money to figure this out and I'm just happy that the truck is running again!