Discussion
Continuing reverse engineering efforts. Looking at the Wheel ECU.
Some undocumented connections going on here. A1 & A3 seem to form an "AND" gate with the signal going to pin 4 of the 5way ribbon cable. This arrives at the hazard switch pin 3. Is it for an LED?
The signal on A4 seems to be connected to an input port on the PIC.
Where as the signal on pin B7 is an output (switch to low) for driving something.
Looking at the various ecu's, they all seem very similar in terms of hardware, Some inputs, a PIC implementing some logic and finally relays being driven, I wonder why TVR developed several different boards instead on a couple of generic designs with differing firmware. It would have saved a bunch of hardware development time and reduced manufacturing costs.
I've not yet tested our unit. Some loss of plating on the pin headers, but it looks fine. Firmware from April 1996
Some undocumented connections going on here. A1 & A3 seem to form an "AND" gate with the signal going to pin 4 of the 5way ribbon cable. This arrives at the hazard switch pin 3. Is it for an LED?
The signal on A4 seems to be connected to an input port on the PIC.
Where as the signal on pin B7 is an output (switch to low) for driving something.
Looking at the various ecu's, they all seem very similar in terms of hardware, Some inputs, a PIC implementing some logic and finally relays being driven, I wonder why TVR developed several different boards instead on a couple of generic designs with differing firmware. It would have saved a bunch of hardware development time and reduced manufacturing costs.
I've not yet tested our unit. Some loss of plating on the pin headers, but it looks fine. Firmware from April 1996
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