GnJ Posted September 29, 2023 Report Share Posted September 29, 2023 I have the Speedhut CAN-bus OBDII tacho and their water temperature gauges and a 'Wiring Specialities' engine harness. The harness has an OBDII port and a CAN H and CAN L flylead. Does anyone know if there any specific settings that have to be configured for them to connect with the ECU ? I've tried both the OBDII port and the flylead so far without success, voltages at both are 3.3v h and 1.8v low, selected ISO 15765 'on' CAN2, Mode is 350z CAN1 on the ECU is setup for two Link CAN Lambda's and a Strada dash, they work ok Thanks Quote Link to comment Share on other sites More sharing options...
GW_Rowan Posted September 29, 2023 Report Share Posted September 29, 2023 Ha ! Just done it on my car. You need to enable ODB output like the attached in the CAN setup and your gauges (should!) come to life. I'm running the watertemp gauge over CAN, there was a mixup my order and the tach is unfortunately old school. GnJ 1 Quote Link to comment Share on other sites More sharing options...
castillaricardo Posted September 29, 2023 Report Share Posted September 29, 2023 @GW_Rowan Do you have a blog or build thread I can eye through? I would love to see what you've done with this Caterham/Lotus 7! Quote Link to comment Share on other sites More sharing options...
GW_Rowan Posted September 29, 2023 Report Share Posted September 29, 2023 1 hour ago, castillaricardo said: @GW_Rowan Do you have a blog or build thread I can eye through? I would love to see what you've done with this Caterham/Lotus 7! Sure thing, here you go. https://www.rowanhick.com/fraser-sp330-full-build-history castillaricardo and essb00 2 Quote Link to comment Share on other sites More sharing options...
castillaricardo Posted September 29, 2023 Report Share Posted September 29, 2023 15 minutes ago, GW_Rowan said: Sure thing, here you go. https://www.rowanhick.com/fraser-sp330-full-build-history Thank you! I have much reading to do! GW_Rowan 1 Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 30, 2023 Report Share Posted September 30, 2023 18 hours ago, GnJ said: The harness has an OBDII port and a CAN H and CAN L flylead. Are these definitely connected to CAN2 and not CAN1? Quote Link to comment Share on other sites More sharing options...
GnJ Posted September 30, 2023 Author Report Share Posted September 30, 2023 6 hours ago, Adamw said: Are these definitely connected to CAN2 and not CAN1? That would explain it, Should the exsisting harness CAN flylead be connected to pins #86 CAN2 L and #94 CAN2 H at the ECU, and if not, do I just splice into these wires for the gauges ? Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 30, 2023 Report Share Posted September 30, 2023 You will need to explain better what ecu you have and how it was wired. The only thing you have mentioned is it has a wiring specialties harness which doesnt tell us a lot. Did they not give you any documentation to show what is wired to what? Quote Link to comment Share on other sites More sharing options...
GnJ Posted October 1, 2023 Author Report Share Posted October 1, 2023 The ECU is: G4X N350x , engine VQ350DE. No wiring instructions supplied with the harness, you just have to specify which ECU they need to make the harness for. Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 1, 2023 Report Share Posted October 1, 2023 Im still not completely sure what you are asking. If the gauges are wired to the OEM CAN bus line that connects to pins 86 & 94, then this should work provided you have ODB2 enabled on CAN 2. Quote Link to comment Share on other sites More sharing options...
GnJ Posted October 2, 2023 Author Report Share Posted October 2, 2023 You've answered the question regarding pins 86 & 94 Thanks Adam Quote Link to comment Share on other sites More sharing options...
GnJ Posted October 2, 2023 Author Report Share Posted October 2, 2023 Gauges working ok now using pins 86 and 94 Thanks again Quote Link to comment Share on other sites More sharing options...
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