Me78569

To bleed all air you will likely need to crank for 3-5 minutes to get her to fire if it was run dry.

Pads are easier to replace in disc haha. I dunno if there is a real true difference in stopping power, it's still a heavy truck ya know ? Drums can take more heat as they are heavier, but discs typically dissipate heat faster if they are not solid rotors.

We reallyshould do a article section for common wiring mods like this.

The PO is always a lazy slob that never did anything "right"

The OEM setup did not use a relay I would make %100 sure it is relayed. The 12v bus on ecm cannot really supply enouhg power to power the lift pump

June bump

If the multimeter says the alternator is putting out more than .03v of ac then you need a new alternator.

So now I am confused, With it set to mv did it read 11.50 && 11.35 ac V or .0115 mV? && .01135 mV? one way to know for sure if the alternator is the case is to remove the alternator charge lead and take the truck for a drive, if the issue goes away then the alternator is to blame.

Good to know. I have never heard of a truck reading AC that's high. Can you set range manually for AC? If so set it to .000

more updates. I have found the ablity to connect to both ECMS, The bad news is, if you thought the ecm was lacking for PID's the PCM is worse. It has speed, TPS, rpm , load. There may be more hidden pid's but I am unsure about it. The PCM is D1 and the ECM is 15 according to the logging. Not sure how that translates to 486 Snippet from the log attached is the log for the data logging from the app. It is very useful, OBDwiz It allows for you to data log raw data, but it seems to only pass MPH request, not sure why. I can confirm that there is no j1939 in the OBD port, or if there is it is no standard in anyway. I believe the j1393 is only under the hood. I might try and connect to that at some point. I am confused on this next part, but Looking at the wiring diagram I see The SCI bus is iso 9141 10.4k baud ( what we can talk to the ecm/pcm over.) The CCD is who knows on 7812.5 baud and 62500 baud, I don't think we are going to find the ability to talk on this bus. HOWEVER reading through the logs of the project from Jdonoghue he states that he programmed the ecm using the SCITX and RX pins on the OBD Pins 6, 7 I am guessing that since pin 6 ( the non-standard pin for iso 9141) points to the ecm but 14 ( the standard pin for iso 9141) that all of the obd scanning tools we use are looking to 14 as it is the standard. This might be why we are having issues. Again I might wire my arduino to pins 6 and 7 to test. Question I still have is how we can talk to both ECMS on the same protocol but use different pins on the OBD, Note that the PCM and ECM share the SCI transmit wire, pin 7, but SCI Recieve on the PCM is pin 14 and on the ECM is pin 6. Since they use the same transmit wire they have to be the same protocol, but I am unsure how the header changes which wire is used. RawDataLog_20160601 214447.txt

AC noise will cause lockup issues. Typically we expect to see less than .01v AC anything over .03v ac is typically considered bad. I would venture a guess that your Multimeter is not able to read AC volts at the right level, .001.

Puuurrrrrrr

Keep us updated hammer!

Agree'd you need to use a relay rather than powering off the ECM . I believe they use a 20 amp fuse on the fass stuff. I might be wrong though. i'd use 10 gauge

Mike, What do you get when you pas ATMA to the truck? anything?

Alright more testing done and I can verify that ((A-105)*.17)*4 reads nearly 0 at idle and accurately all the way up to the boost fooler limit of 18psi on my truck. The 105 will need to be edited for your altitude, and I can't answer why it is 105kpa vs 75kpa for my altitude, but it works.

that is actually a perfect image for a shirt.

hummmmm

well a little more testing was one on the map sensor. ((A-105)*.17) *4 gets VERY close for a early truck but I am still testing more. I am not sure where the quad limits boost at as I am unable to top 13-14 psi on the ecm side of things but boost levels follow pretty close to that point. for some reason you need to use the inverse baro reading so rather than 11 psi where I am at for baro you need to minus 14 -(-baro) , don't ask me why.

I forget to grease them haha, so I stick to non - grease.

I'd say most of us will get acceptable life out of either assuming they are good quality.

Yea if you are going to pull off the dash you might as well. very strange. really until you can take a peak at the core I would ignore it.

Humm, I have had this happen before in some of the older BMW's that I had , but that was typical of them. Has it been humid in your area as of late? Even a drip leak in the core should make the cab smell sweet so I am not thinking you have a core leak. Rather I think you may be having a build up of moisture due to humid days and cold nights. But I am taking a shot in the dark and just guessing.

Does the vapor smell sweet?

You have to minus the total of sea level plus altitude. I need to get the equation more exact. The above isn't right ((A*.145)-16)*4 is working close ishm. The .145 needs to be modded and then increase 16 to 17 for me. I'll see if I can set baud to 7812.5 Err you are right though. Back into math world to figure it out. Point and shoot blindfolded