LML standalone harness

[killerbee]

I have wondered if EFI connections wire gauge is sufficient.

[GMPX]

I would say it is fine as there is no actual load on the injector outputs so it is a very momentary large current draw as the caps charge.

[GMC-2002-Dmax]

Ross,

The 2015 ECM I have is really being picky, I assume the pinouts are the same as the 2011-2014 ? Or is there a CAN+ CAN- Difference ?

It fails at 524928 bytes every time on the bench, any tricks I don't know about since its out of the vehicle ????

Was going to put it in the 2012 and see if an in vehicle flash would work.

???

[modpcm]

Ross,

The 2015 ECM I have is really being picky, I assume the pinouts are the same as the 2011-2014 ? Or is there a CAN+ CAN- Difference ?

It fails at 524928 bytes every time on the bench, any tricks I don't know about since its out of the vehicle ????

Was going to put it in the 2012 and see if an in vehicle flash would work.

???

Hi, did you found what was wrong ?

[GMC-2002-Dmax]

Not yet

[DURAtotheMAX]

Ross, could you please check which specific pin on the blue connector you are using as ground on your bench harness? Using a multimeter, I found a bunch of pins on the blue connector that are internally tied to ground..........but Im worried that those pins I found maybe are just low-reference circuits for sensors. Since the ECM has a large inrush current when first powered up, I would hate to use the wrong "ground" pin on the blue connector and have it fry an internal ground trace.

An interesting note I found...on the LML ECM, some "ground" pins are also tied to the case, and others arent. I wonder why? On every other ECM I have worked with, everything marked "low reference" or "ground" is also tied to the ECM case. According to the truck schematics, both the "case-grounded" ground pins and "non-case-grounded" ground pins are tied together externally in the wiring harness. But I wonder why they arent tied together internally?

Thanks
Ben

[30 RUM]

I know this tread is over 2 years old, but a quick question. Do we need to put any resistors on the Can + - to make the 120 Ohm load?

Thanks

Sam

[Road]

I know this tread is over 2 years old, but a quick question. Do we need to put any resistors on the Can + - to make the 120 Ohm load?

Thanks

Sam

Depends what you will be using to flash it with. I have never had a issue using EFI Live bench flashing. But if you wanting to Tis flash then you will need a load.

[GMPX]

Sam generally you don't need to do this on GM ECM"s as they have the CAN termination resistor in the ECM itself. In fact I can't think of one GM ECM that needs it.

[30 RUM]

Sounds good,

I just wanted to make sure I had everything before making my bench harness. I didn't want to have a CM2350 flash back .

Thanks