problem reading suzuki car ecu 33920-057k8

[swami]

good day
I am trying to read the contents from this ecu with sh7058 mcu
I Have connected cables to the AUD port as per the instruction. and powered the ecu via main harness connector

The bin file created is all (00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)
for every line of data.
This ecu still starts and runs the car perfectly with no warning lights
Could my interface be faulty though it is recognized by the PC?

Can anyone help me troubleshoot this issue?

[PVTech]

Hi swami,

have you doublechecked the lines? Have you traced the lines back to the mcu? It would be better if you could provide some hi res photos of the ECU.

[swami]

the appropriate connections have been made,
photo is attached

is it possible this ecu requires a resistor and/or boot jumper?

[swami]

i found pinout of hardware that matches my ecu.
something is still not right
any insight or suggestions would be most appreciated

[attachment=0]swift.zip[/attachment]

[PVTech]

Hi,

the bin included in the swift.zip file is correct. Isnt this from your ecu?
Following the directions from the datasheet it should read the processor.

[Twice]

5 files and none is same... partnumbers etc shows up though so not total corruption.
we are testing some tweaks on setting up the ecu, same mcu as in the navara ecu.

Psyche, did AUD reader have WDT function pin? Or shall we go for my crude timer on extra ttl cable when/if time for writing test?

[swami]

it is from my ecu.
i have never seen an ecu read out in this manner

[PVTech]

I compared the 2 files. It seems that the mcu resets every few bytes.
I remember the old suzuki ecus had an external watchdog and we had to cut a trace in order to read them with BDM.
Digitalpin 3 in arduino is a 125Hz signal which you can use for a watchdog signal. It is used in some subaru ECUs to read them.
Maybe you will have to watch the reset and NMI signals in your ecu using a logic analyzer. If it pulses then there is an external circuit (watchdog) that resets the ecu during reading. Trace the reset and/or the NMI line and try to "cut" the trace somehow. Either you will desolder a resistor or you will have to actually cut the trace on the board.

[swami]

thanks
i will test and report my findings

[swami]

connecting the digital pin 3 to the watchdog timer pad was all need to get consistent read from this ecu no cutting was required
thanks again.

[PVTech]

Glad that you succeeded.