EFIDynoTuning Forum

That’s awesome. That spare pad area you used is where the knock sensor chip would be on 6cyl sd47 hardware, fyi

I have 100% decompiled the DCL - CART/UART protocol data stream for transmitting and receiving.
Using plain Java, a MAX485 chip, can now communicate with the EEC's that have the 81C62 or 81C65 CART chip, on the D+ and D- test connector.

The C3P2 lightings have mode 0x05 which is for 'Alternate Calibration'. Has any one had success with that?

I am really interested in the following modes:
- 0x43: DCL_DM_ProgramDataDownload
- 0x45: DCL_DM_ProgramExecution
- 0x46: DCL_DM_A-D_SensorValueSubstitution

Has any one had success with this?

From what I understand, is that using A-D_SensorValueSubstitution, this is kept in KAM, and should be able to change any PID value.

I'll be posting my source code, and schematic of the MAX485 once I have more testing complete.

Why can't the balancer itself have 35 notches cut into it?
I don't see this as a 'weight/balance' issue, since all wheels are being added weight to the balancer, and I doubt any of them are 'balanced'.

I've been thinking about taking my old balancer(stock), 351w and have this done at a local machine shop if possible.

I'd say it is correct, but could be misinterpreted.
open drain means no connection, the circuit is open, this is the 'pin configuration'.
Without a pull up resistor, the output will float.
Must put a pull up resistor to 'latch' 5v.

Schematic?

simplistic example:
LSO#1 output pin||||-------- can output 0.0v to 0.8v, or 5.0v. --------TTL logic-------Pullup Resistor------ driven device input (+).

You do not connect the devices ground pin to the output LSO pin.

Either way I have a connection to ground on CPU pins 21 and 23 which activates the relay. If I leave the power to the ecu off for several hours eventually they will shut off.

??
Connection to ground on pins21 and 23?
??
A schematic would help visualize what you have going on.

Not same bin, newer, almost identical.
The A1C 'stock' bin shows the following: Yes, R46 is memory location where bits are set in code, then it is written to R2 LSO, as far as I understand.

If you have test code, write directly to R2.

efloth wrote: ↑2023 Jan 12, 20:25 I'm pretty sure I exhausted all the possibilities. The 4x4 is using what normally would be extra outputs.

I could wire these up in parallel.

https://www.sainsmart.com/products/4-ch ... lay-module

Run the CPU LSO line directly to this device under the hood outside of the ECU.
Since this device states: "Standard interface that can be controlled directly by microcontroller ... TTL logic active low)"
You wont need any other components. The 8061 LSO drives TTL devices directly.

The LSO pins are standard TTL, so 3.3v-5V and probably 50mA.
There are multiple routes to go. Only direct connect to another TTL device.

You will need to make a small circuit with a resistor, a diode, and transistor as an input from the CPU LSO.
Then your external relay is switched on from the transistor. The transistor is switched on from the LSO.

You are going to need to know how many Amps the electric fan draws. Say it is on a 20Amp fuse. You could then get a 5v TTL coil driven high current relay that supports 12v/25Amps. Then you won't need extra components, just drive the relay directly if it is TTL. These exist in the Arduino world.

I think the easiest, is to wire the CPU pin from the board, to the spare 60pin pin on the circuit board, just a straight wire, then that is done, and less chance of screwing something else up on the board. Of course you could use say pin #34 on the 60-pin connector, follow its trace, you will notice it goes to a blank missing component with 14? or 16? pins. This is for Data Output Link(DOL or TripMinder), and the chip drives PWM to the TripMinder from the CPU.
What I am saying, is you could run a smaller wire from LSO CPU pin, that missing chip area, then solder in components to drive Pin#34. Then your 60pin under the hood is a 5V on/off ready to go.
I am planning on using DOL, pin#34 as I have a TripMinder from a 92ish TBird that I'm putting in my dash.

Next wire up the pin on the 60pin connector to your relay, or your custom TTL relay driver.
This is just off the top of my head.

I will be doing similar soon, I have a VGT that I am planning on hooking up, but using HSO.

I'm using all the documents available to create the tools.
Specifically: EEC-IV Pocket Reference, EEC-IV Custom Circuits Integrated Hardware and the EEC-IV Software Manual.
All information about 8061/8065 chip architecture, memory, programming, J3 DCL etc is there.
I have Arduino Mega + RS485 working with CART/UART DCL, just had to write my own software.
Going to be connecting it to J3 soon.

I'm going down the Arduino route for testing, don't really need any other hardware.
Once the software is 'perfect', I will then think about what hardware components are feasible, scalable and future proof.

ps. Digi-Key just shipped me 10 female J3-Port connectors. Took 2 months.

Low Speed Output 1 and 3 are available, on/off.