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Post Info TOPIC: Powring up the ECU


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Powring up the ECU


The same instrutions as with Kawi ecu work also with 2006 busa ecu.

Verification that everything works can be done by:
1) Ensuring that +5v is present after applying 12v
2) Checking from gauge data presense, that ensures even with an ecu that has nothing connected that the processor is running

Below what the gauge data looks like as a TTL signal (appr 7kb/s, about 8 bytes, 8,n,1)

gauge data stream on scope

power and ttl converter

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Didn't you post in the other thread that pin 29 was TXD?

Pin 29 is programming voltage input on the ZX-12 ecu.

You might want to edit your post to make that more clear.

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You are right - so lets clarify: Gauge data stream has not changed its still in 33. The 29 is programming TX. I have not yet seen 29 to output anything, but 33 gaugedata (marked tech on the board) gives a hartbeat to instrument cluster. If that hartbeat is missing the FI light on cluster will be lit up. (EDIT - but you reminded me about one important thing. As I had dremeled one of the resesistors on line to 29 I can get the value for the missing resistor from the cpu to harness line 33 smile.gif )

12345678935363738394041
ig1ig2ig3#11#21#31#41solfpe1n-g+oxhtxckafchtb
1011121314151617424344454647
ig4exssol2sckmd1cos1cos2b+vmn+g-oxavfhtf
1819202122232425484950515253
e02cltntmstscov1cov2cov3vccvtathathwpaat
26272829303132333454555657585960
e03e01statxd1rxd1sdsfwetechrcte2tacocodegppmdongndh


-- Edited by PetriK at 06:57, 2007-10-30

-- Edited by PetriK at 07:01, 2007-10-30

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To make things even more clear it appears the 32 bit CPU requires no external programming voltage. After looking through the data sheet I haven't found any pin or reference to any type of programming voltage.

So the function of pin 29 on the older 16 bit ECUs was not moved to a different pin on the newer ECU, it was removed as it was no longer needed.

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PSU noise ?



When tracking the flashing problem a question arised of how much PSU noise is allowed by the processor ?

12v to ECU (output from VC78T12C)

12v

5v from ECU:

5v

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Powring up the ECU


I wouldn't worry about that amount of noise. I'd be willing to bet if you put your probe on a ground point somewhere on the ECU board you'd see pretty much the same signal

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Yep - dont really worry bearing in mind the amount of noise that injection, ignition and charger introduces, just limiting the potential reasons why programming does not initialize.

The measurement points were as close to the processor as possible (next to a pin) and Vcc on the harness connector. Same ground though.



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