Injection Duration Monitoring Directly from the TCCS?
- Thread starter CajunKenny
- Start date
Now you're talking, PI! That would be awesome to see the data output in real time from the stock TCCS.
The only reason this diagnostic capability is there is for the Toyota engineering and QC teams that worked on software/hardware. You can read out any variable in RAM in real time, that includes all the diagnostic and operating mode flags in addition to any computed variables. There is other stuff in there too such as dumping out the ROM without removing the chip and grabbing the software version number.
By the way, Vf is connected to a simple logic port of the MCU through a low pass filter. The way it generates the different voltages is by varying the duty cycle of the Vf signal (Port A bit 3 by the way) at the MCU.
By the way, Vf is connected to a simple logic port of the MCU through a low pass filter. The way it generates the different voltages is by varying the duty cycle of the Vf signal (Port A bit 3 by the way) at the MCU.
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Very cool, Iv always wished i could log more things such as injector duty cycle. Would the usb board allow you too monitor everything going on in real time? Could you even watch the factory knock sensor signals ect? That would be very helpful in street tuning.
Yes. The actual knock signal processing is done on a separate MCU chip and the output of that computation sent to the primary MCU where it is used as an input to the ignition calculation. I'm still working on understanding the details. Its only 12kB of code, but they packed alot of complexity into it and it is highly optimized. Makes it tougher to reverse engineer. By the way, the USB board is only for testing purposes. It would not be needed or used for monitoring an ECU mounted on a running car.
How would you connect the data flow from the MCU to a laptop? would you be able to solder in a usb port directly to the board then?
You need a serial to USB chip and a few additional parts. I would imagine that a small daughter board (0.75 x 1.5 inch) would be sufficient. Most likely would cut a hole in the side of the ECU to stick the USB connector through. Details are TBD for now.
3p141592654;1310899 said:
Are you coding your own software or is there already a program out there?
There is stuff out there, but not public domain except for the USB middleware. What I have so far is written by me in VC++. That is why I say 4-6 months. Coding is slow going especially when you have a real job to take care of so the family can eat!