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Jcooke1  
#1 Posted : Tuesday, November 26, 2019 12:04:51 PM(UTC)
Jcooke1

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Location: Maine

I have a 2000 cummins engine that has a J1939 data link that I've adapted to a 9 pin connector to plug into the bluefire. I have J1939 + (pin 2 on ecm) connected to pin C on the 9-pin. J1939 - (pin 12 on ecm) connected to pin D on the 9-pin.

Device powers up, connects to my android phone, and begins to blink green indicating that it is waiting for me to turn the key on, but never connects to the vehicle with key on or off.

There is a diagnostics switch that I've tried both momentary and continuously holding but that seems to make no difference.

Any suggestions?
Mark  
#2 Posted : Tuesday, November 26, 2019 12:43:25 PM(UTC)
Mark

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2000 is pretty early for J1939 as the spec wasn't released until 2004. But many OEMs were installing 9-pin connectors to be ready. Chances are your J1939 data link also has pins for J1708 where your data is probably being transmitted.
Jcooke1  
#3 Posted : Tuesday, November 26, 2019 1:04:35 PM(UTC)
Jcooke1

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My ECM map shows that I have the j1939 and a separate twisted pair with j1587. I havent tried to use the j1587 for anything. I don't see any j1708 anywhere in the ECM diagrams. I've read that j1587 and j1708 are somehow related, should I try putting the 1587 to the 1708 inputs?
Mark  
#4 Posted : Tuesday, November 26, 2019 1:18:47 PM(UTC)
Mark

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Yes. J1708 is the hardware spec and J1587 is the messaging spec but most people just refer everything as J1708. In the J1939 world, CAN is the hardware spec and J1939 is the messaging spec. Our 9-pin adapters support both J1939 and J1708.
Jcooke1  
#5 Posted : Tuesday, November 26, 2019 1:34:25 PM(UTC)
Jcooke1

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United States
Location: Maine

Excellent, thank you for the quick responses. I'll connect the other data wires tonight and see how she likes that. Thank you!
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