Hybrid Transmission Control for EV conversion

[Eagle5]

I've got a 2ML70 transmission out of a 09 Hrybrid Tahoe. I plan to use this transmission in an EV conversion. I'll use a prius inverter to power the two electric motors, but I need control over gear/mode shifts. This is a long shot, but does anyone know the CAN data for transmission gear control. This transmission has several different gears inlcuding EVT 1 , EVT 2, 1,2,3, and 4.

I've got the original inverter, transmission, and ECM setup and I am capturing CAN data from the GMLAN. I can see the gear selection reflected in 1F5. I'm not sure if another computer ultimately drives the TCM's decision process. I may not be able to override the TCM, but it seems like the inverter does more work calling the shots in this configuration. There is a Manual gear selection that might work as well.

[Eagle5]

I don't think the inverter is talking on either bus, but I could be wrong. I'm going to take another look at the wiring.

Here is the only thing I see on the PTLAN
0A8 2C 03 2C 03 02 53 FC

Here is a capture of the GMLAN Data
0AB 6C 6C 20 00 38 00 FA 00
0AD 00 A0 0A 00 20 00 FF FF
0AF 00 A0 0A 00 00 00 FF FF
0C7 03 FE 00 00 00 00
0C9 00 00 00 13 00 41 08
193 25 CE 5A 31 05 CE 00 07
1A1 00 10 43
1C3 45 CE 06 A0 00
1ED 81 90 00 00 00 00 03 ED
3A1 07 65 04 00 00 00 00 00
3D1 70 37 80 00 00 00 00 00
3E9 00 00 00 00 00 00 00 00
0AB 6C 6C 20 00 38 00 FA 00
0AD 00 A0 0A 00 20 00 FF FF
0AF 00 A0 0A 00 00 00 FF FF
0C7 03 FE 00 00 00 00
1F5 01 0D 00 01 00 00 03
0C9 00 00 00 16 00 41 08
193 45 CE 5A 30 05 CE 00 0A
1ED 81 90 00 00 00 00 03 ED

[Gatecrasher]

Here's the GM corporate standard message names. You'll want to get a copy of GMW8762 for what you're doing. https://store.accuristech.com/standards ... id=2612580

PPEI is platform to powertrain electrical interface. Those are standardized messages that cross the boundary between the platform (body, chassis, whatever you want to call it) and the powertrain control systems.

The unlabeled ones aren't defined in the standard. They're local to the powertrain and don't cross the boundary to the platform controls. You'll need to reverse engineer those yourself.

Code: Select all

0AB 6C 6C 20 00 38 00 FA 00		
0AD 00 A0 0A 00 20 00 FF FF		
0AF 00 A0 0A 00 00 00 FF FF		
0C7 03 FE 00 00 00 00			//TCM: PPEI Transmission Output Rotational Status
0C9 00 00 00 13 00 41 08		//ECM: PPEI Engine General Status 1
193 25 CE 5A 31 05 CE 00 07
1A1 00 10 43				//ECM: PTEI Engine General Status
1C3 45 CE 06 A0 00			//ECM: PPEI Engine Torque Status 2
1ED 81 90 00 00 00 00 03 ED		//ECM: PPEI Fuel System Request
3A1 07 65 04 00 00 00 00 00		
3D1 70 37 80 00 00 00 00 00		//ECM: PPEI Engine General Status 2
3E9 00 00 00 00 00 00 00 00 	 	//ECM: PPEI Vehicle Speed and Distance

You can sometimes find some hints about the unknown messages by searching the GM Mode 6 documents using Google. Like so:

site:https://gsitlc.ext.gm.com $0AB

That references some documents that say that's a TCM message. Doesn't tell you what's in it, but it at least lets you know where it originated. Every little bit helps.

[Eagle5]

Thanks for this. I went ahead and got that spec.