Paul Mugabi Posted November 7, 2019 Report Share Posted November 7, 2019 ECU is a PnP WRX104+. USB communication was fine at first. Today I tried to reconnect to the ECU but I'm unable to. The PC Link USB connection is seen but I can't connect to the ECU. Between the last connection and now, the wiring loom has had some changes to it to remove extra wires and a CAN connector was also added to the CAN1 port. I have removed the CAN connector since I've read that it can cause problems. The ECU is fine and still runs the car. However while troubleshooting I noticed that RS232-TX has a steady -11V on it (yes, that's negative). Could this be the problem and does anyone have any ideas on how to resolve this? Quote Link to comment Share on other sites More sharing options...
TechDave Posted November 7, 2019 Report Share Posted November 7, 2019 RS232 is present on the CAN 1 port, this is the same RS232 that the micro chats with the USB. As a quick test, unplug CAN 1 or switch to CAN2 (no RS232) Quote Link to comment Share on other sites More sharing options...
Paul Mugabi Posted November 7, 2019 Author Report Share Posted November 7, 2019 19 minutes ago, TechDave said: RS232 is present on the CAN 1 port, this is the same RS232 that the micro chats with the USB. As a quick test, unplug CAN 1 or switch to CAN2 (no RS232) Hi Dave, CAN 1 was unplugged as mentioned in the original post. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 8, 2019 Report Share Posted November 8, 2019 20 hours ago, Paul Mugabi said: I have removed the CAN connector since I've read that it can cause problems. Have you actually unplugged it from the ECU board, or outside the ECU case? Quote Link to comment Share on other sites More sharing options...
Paul Mugabi Posted November 10, 2019 Author Report Share Posted November 10, 2019 Thanks for the response. I have unplugged it from the board. There is nothing connected to either CAN1 or CAN2 at the moment. Will fixing this require sending the ECU back? Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 10, 2019 Report Share Posted November 10, 2019 In windows device manager, is the ECU showing up in the COM ports section with no yellow exclamation marks or anything? What happens if you try to do a firmware update in PC Link, does it still not connect? Quote Link to comment Share on other sites More sharing options...
Paul Mugabi Posted November 11, 2019 Author Report Share Posted November 11, 2019 The Link USB COM port is showing properly with no yellow exclamation marks. I have tried with 2 different laptops (Windows 7 and Windows 8) and with 2 different comms cables and still no joy. An attempted fimware update returns the message: Error, could not connect to ECU and then provides various troubleshooting steps which I have already carried out. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 11, 2019 Report Share Posted November 11, 2019 Ok, unfortunately it is sounding very much like you have a hardware issue. It seemed like too much of a coincidence at first that it lost USB comms when you were messing around with CAN1, but it sounds like you have ruled out all possible interactions there now and covered all other troubleshooting steps that would normally be requested. It is pretty rare for a hardware issue on the USB side but I cant think of any other explanation that is more likely. I suggest you email [email protected] and get their advice on getting it inspected. I dont know where you are in the world but it will likely need to go back to NZ. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.