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Hacking up Honda's ECU
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PostPosted: Tue May 17, 2005 6:19 am 
Quick question, if I use datalogging for my JDM p30 ecu, will the error codes still pop up?


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PostPosted: Tue May 17, 2005 9:45 am 
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Joined: Tue Jul 27, 2004 2:17 am
Posts: 293
Location: Normal IL
tianporn wrote:
Quick question, if I use datalogging for my JDM p30 ecu, will the error codes still pop up?

if you mean will the cel light when per stock conditions, yes.
will the cel flash when the Service connector is flashed, yes.


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PostPosted: Fri Jun 10, 2005 8:55 pm 
Sorry to drag this back uo but i was reading the WIKI and found this
Quote:
In its stock configuration, an OBD1 car has a diagnostic connector under the dash which is wired to the ECU's serial port. The ECU's serial port is also wired to CN2. This diagnostic connector works in half-duplex, meaning there is only one wire which is used for receiving and transmitting by both the diagnostic tool and the ECU, and thus only one device can transmit at once.

J12, when removed, disconnects the receive line from the transmit line, so the serial port can work in full-duplex mode, meaning both devices can send to one another simultaneously through CN2. This, of course, breaks the stock diagnostic connector under the dash. However, the benefit of full-duplex mode is more reliable Data Logging. Some programming work is in progress to take advantage of this to log data at a much higher sample rate without clobbering any commands sent to the ECU.


Do what I gather from this is that the error codes will not flash on the engine check light?

Please clarify.

THanks


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