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Now for the rest of the story: After using our plaza Arduino CTIS ECU for a while we decided to swap in our Dana Spicer M939A2 CTIS ECU and reprogram it. The plaza unit is great and works fine we just want both units setup the same so to have a backup, and the Dana Spicer unit being push...

Thank you. I do have mud now. I'll try that and report back so we'll know if we should add to the list—

Thank you all. Good comments and solid advice as usual. We'll button up in the morning and drive to lunch with friends. Maybe even try to test the ABS system on the way. What a great forum, I am grateful for you all. It would have taken much longer with less confidence without your cajoling...

Maybe. The light was off until we replaced the ABS light circuit breaker which had been removed. Since installing a new circuit breaker light has been on. The DPA III+ has been finding faults with voltage or open circuit on ABS while all other ECU's reported. Replacing R12 and R13 (both...

Well, of course it was not just R13 under the PDP; R12 near the Cat ECU is also looking like blackened redfish, in and out. So, the question is since everything works, EXCEPT ABS do/did we have: 1— old resistors that died; 2— a bad ABS ECU; 3— a bare hot wire grounding out? I am not...

New resistor arrived and tested, isolated, I wanted to check before removing the PDP again. It looks like we have a winner. I hopefully that is our only ABS issue—

I appreciate all the help and even the cajoling. Glad to have the testing kit and will add additional software over time. Would very much like more information about our unit. The -20's [1998, before the A1] don't have items like the ABS brakes, so where did you find the specifications for...

Right: auto off goes to zero. Thank you. Thank you. I have been wondering the same most of today, hoping someone else would speak up. I'd prefer to purchase a ready built, though I can source the parts, test, and pot my own once confirmed. Thank you—

Not knowing the proper testing protocol intended for Pvt. Snuffy, nor the specifications of the resistor, beyond 60 or 120 ohms. I can only say 11.5 kOhms may be close. The other tests suggest failed resistor. The isolated test, as we would do for one on a circuit board suggests the resistor...

Here is a photo of P250 terminal resistor. The only P250 label I found was a J1939 wire coming back in a huge bundle from P115, P116, X21, and a couple of 'stringers' unconnected to anything. The P250 terminal end was under the PDP, in the separated space below the circuit board above the...

Haven't found a P250/J250 connector as yet. It is not behind the instrument cluster. Found a terminal resistor under the PDP, on a terminal end of P250. I haven't seen J250 anywhere. There are two J1939 cables running off the diagnostic port: 1— J183 to P183; and a huge bundle that appears...

Thank you. We will keep swinging a the issue(s)—

Only J1708 is blinking, which the DPA5 manual states, whether green or red, is the signal that the adaptor is reading the truck side. The adaptor's lights come on and blink whether the computer is connected or not. I am thinking either adaptor or wiring is the next issue to explore? Perhaps...

Thank you @Lostchain that certainly was one of my issues. This is still one, too: No blinky J1939 =/ I have some winter prep to do this weekend around the house, hopefully I will finish that all tomorrow. I appreciate all the help, persistence, and advice—

halleluia. Installed twice, then a third time; obvious ineptness. Still no J1939, though J1708 worked: It looks like I have plenty of issues to learn and investigate here. Could the transmission codes be related to installing Eco Hubs recently?

I'll go there again, though I recall that link just downloading. In fact I think it downloaded several times as I didn't think anything was happening and ended up having several copies in my download folder. I do not understand windows, maybe my ineptness—

I did. And the Dana one, too. The Dana software also does not work. I think the first issue is truck side since J1939 does not blink?

1— no oscilloscope; 2— will review schematic and check; 3— I have no idea how to bench flash an ECM; 4— we are working through all the electrical already replaced almost all the relays and battery disconnect, LBCD connections are next, then grounds; 5— buying another laptop is not attractive, or...

Only two choices available. No choice for 101 - DG DPA II/III/III+ - COM 1. Searched dgtech.com for older downloads without success so far. Will check the USB to serial as COM1. Being Linux and fruit, Windows settings is a f$%&@ing nightmare—

Right. Ours not blinking on J1939 is not a good sign. <CRAP!> another issue to address. Now how to determine if it is tool or truck—