SL/R230: DAS won't communicate with ECU
08-23-2020, 08:53 AM
#1
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DAS won't communicate with ECU
I recently got a Star system off of ebay. Still have an issue with Xentry, but the standalone DAS appears to be working fine. My issue is that I cannot communicate with the ECU (EM-SFI). I have no problem with other components on that CAN-BUS (TCU, ESM, etc) or any other controllers as far as I can tell. I'm certain that the ECU has to be communication on the CAN-BUS in order for the car to start and drive, so why can't I connect to it? I don't know if this could be an issue with my Star system, or something is wrong on the vehicle, any suggestions?
08-23-2020, 12:49 PM
#3
Banned
The engine won't start unless it can communicate on the high-speed CAN. However, DAS communicates to the engine ECU via a "K-Line" connection/protocol and not DAS. Apart from inspecting the OBD-II connector for corrosion and checking the unlikely possibility of a broken wire via a continuity check, I can't think of anything to try.
08-23-2020, 09:57 PM
#4
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I checked the voltage at Pin 7 (k-line) on the diagnostic connector and it tests OK. I suspect that I have a problem with my test hardware, probably a bad cable. My OBDII dongle and app are able to show ECU information, but I don't know if it uses K-line or CAN. I'm not an OBD expert, but it looks like the OBDII standard supports both protocols.
09-04-2020, 02:46 PM
#5
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Just to close out this thread, I finally found the problem. On my diagnostic connector, the pin 7 contact is recessed further than it should be. If I totally bottom out the connector, I have communication with the engine ECU. The mounting for the OBD socket is flimsy, so you have to work a bit to get it fully seated.
