Rickvr

On 8/20/2023 at 11:18 AM, Rickvr said:

Thanks :-)

 

On 8/18/2023 at 11:51 AM, Mackpro said:

If your original VECU was a 12MS48 M4  then a M5 or M6 will work. 

Finally I found a used VECU which is the M5. Yes it works however the 6-4 code is still there. Must be the wires even though I tested them. When I have time I will run new ones. If that doesn't work it must be the ecu maybe..? If that's the case I will leave it like it is.

On 8/18/2023 at 11:51 AM, Mackpro said:

If your original VECU was a 12MS48 M4  then a M5 or M6 will work. 

Thanks :-)

2 hours ago, Mackpro said:

The HP level determination is in the engine ECM. The rear gear ratio, tire size and various other parameters are stored in the VECU. I’ll do some looking on what you have 

Thanks! Meantime I disabled the limp mode by removing the mark on idle shutdown.... in V-macIII dealer programming. It runs awesome now :-) Except the error light is still on. I think and buy the M6 version of the vecu just to check. I can't see that there are many differences. And yes the vecu has nothing to do with HP etc.

I'm so happy it works so I can work. Love my truck. (again :-))

So my vecu is the 12MS48M4/12MS411M4. I can't find one.  Would it matter if I put a 12MS48M6/12MS411M6 in? Thanks for your reply.

Not the ecu of my truck original :-)   over 2 million miles.... and the look at the fuel used

On 8/7/2023 at 7:30 PM, mowerman said:

havent been following since i really dont have suggestions  have to give hats off to your pail invention ingenious   just spotted it.dont throw the rest of it out,,,,,it may  double as a welding helmet...good luck bud...bob

Thanks😃 some progress finally. got the scantool and it works! the vin in the ecu is not from my truck but it's for a e7 350. now im looking for someone with access to the mack dealer portal to get the proper files to program the ecu and vcu to my vin#. 

On 7/16/2023 at 12:08 PM, Rickvr said:

Thanks will try that!

 

voltages and resistance are just like you said. im trying to find a vecu but no luck. meantime i use it like it is as i have to work. it has way less power which is shit. 

On 7/15/2023 at 11:54 AM, Mackpro said:

If your having the same issue with both VECU then probably a wiring issue.  If you a a ABS ecm next to the VECU, unplug the ABS ecm.  Find the yellow and green wires . Using a ohm meter and  with in off position. You should have 60 ohms across the 2 wires. With the key on you should 2.5 or more volts on the yellow wire to ground. On the green wire you should have 2.5 volts or less. The green is the low side and the yellow is the high side . The more data that’s being transmitted the higher the high side voltage goes and the lower the low side goes. 

Thanks will try that!

11 minutes ago, Rickvr said:

The wires are good. Meantime still stuck. Ordered nexiq usb link 2 but happened to be a none working clone. I'm out of options and will never go back to that mack so called dealer. What will be a good affordable device/scanner to use. I have the mack programming software.. Thanks.

Maybe there is something wrong with the used VECU I bought.... Pfff. If I only could try a different one. 

On 6/22/2023 at 9:09 AM, Mackpro said:

Joey is correct, sounds like a J1939 high speed data link issue. The truck is running on the low speed data link J1587 so that’s why there is a delay between key off and actual engine shutdown. The J1939 wires are always twisted green and yellow wires. Sometimes it will have a third wire which is a shielding wire.  The used VECU should work even though it’s the wrong VIN. But will have to reset parameters such as , road speed limit, tire size , rear gear ratio and trans top gear ratio. The HP level is only in the engine ECM. I wish I had seen this post way earlier. All R-series trucks with ETECH engines had their VECU’s mounted with the connectors facing up. And a Joey said the windshields leak right into them. The first sign of any weird issues, this is the first place to check ( on a R-series). It would have been nice to get the VECU programed to match your truck . But if the Tech was not 100% confident then it’s probably best he didn’t. Programing VMAC 3 ECM’s is a multi step process and one wrong move and you turn the ECM into a paper weight. 

The wires are good. Meantime still stuck. Ordered nexiq usb link 2 but happened to be a none working clone. I'm out of options and will never go back to that mack so called dealer. What will be a good affordable device/scanner to use. I have the mack programming software.. Thanks.