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Hacking up Honda's ECU
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PostPosted: Sun Aug 16, 2020 2:16 am 
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Joined: Sat May 22, 2010 9:12 pm
Posts: 1
Hi,
I have OBD1 Honda ECU with Hondata S300 v2.

Problem: Suddenly i'm unable to log my battery voltage or not getting any input in the ECU/s300 smanager.
i checked and there's 12v power supply in:
- D1 pin (VBU)
- A25 pin (IGP2)
- B1 pin (IGP1)

i need help isolating the issue by identifying what are the + and - (ground) ecu pins that actually generates/supplies the battery voltage datalogging in the Honda OBD1 ecu. This way, i'll make that as a jumping point in my troubleshooting.

any suggestion(s) in testing & troubleshooting would be best appreciated. Thank you very much.


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PostPosted: Tue Aug 18, 2020 8:02 pm 
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Joined: Mon Apr 09, 2018 3:30 pm
Posts: 15
PIN A23 A24 Power Supply Ground
PIN A25 Ig Power Supply 12V DC
PIN A26 Logic Ground


PIN B1 Ig Power Supply 12V DC
PIN B2 Logic Ground
PIN B12 B14 B16 GROUND CKP CYP TDC Sensor

PIN D1 Constant 12V DC
PIN D19 D20 +5V DC
PIN D21 D20 Sensor Ground


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