Aidan99 Posted January 5, 2021 Report Share Posted January 5, 2021 Hey, I am having trouble with my link g4x, can lambda connection. I have wired it up all correctly and the sensor is getting warm so I know it’s getting power (also checked with multimeter) but it just keeps saying connection not found when I go to set it up on the laptop. The can h and can L is also getting low voltage power. I go into my runtime values and it says the can is off, so I am completely stumped I feel I have tried everything any help would be much appreciated. Thanks Aidan Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 5, 2021 Report Share Posted January 5, 2021 What ecu do you have? Is the lambda connected to CAN 1 or CAN 2? Can you attach the tune. Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 5, 2021 Author Report Share Posted January 5, 2021 I have a g4x for a r33 skyline. I have tried both an configured to both Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 5, 2021 Report Share Posted January 5, 2021 10 hours ago, Adamw said: Can you attach the tune. Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 5, 2021 Author Report Share Posted January 5, 2021 What part of the tune do you want to see, or Do you want the whole file Quote Link to comment Share on other sites More sharing options...
dx4picco Posted January 5, 2021 Report Share Posted January 5, 2021 upload your complete pclx file Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 skyline base map 2.pclx Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 Can you give us some photos of the wiring, mostly the CAN connection to the ECU and inside the back of the CANF plug if you are using one. Your map shows CAN errors on CAN 1 which is usually a wiring problem. Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 Green an white is what I was told was can h and can l from otaku loom that was made for the canbus Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 In your map you have the lambda set up on CAN 1, but it is plugged into CAN 2 on your ECU. Can you load this map in and tell me if any different. skylinebasemap2 CAN changes.pclx Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 No different still can’t find device Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 Update to the latest firmware and then have a look at the runtimes screen CAN tab and tell me if there are now errors showing on CAN 2. Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 This is after the firmware update. Still so stumped. 63168728922__DA7373EE-1D7F-4C1D-8E80-FC48CE040D53.MOV Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 Yeah, the ecu is getting no acknowledge from the lambda device, that usually means wiring issue. Unplug the CAN plug at the ECU and also unplug the DTM and check continuity from end to end. Also, pull the orange wedgelock out of the DTM plug and make sure the terminals are still all the way home and with the barb locked under the shoulder. I have seen some users not push them all the way home before and they back out when you connect the plugs together. Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 Hey I have just checked the continuity from the ecu plug to the dtm for the can H an can L and it is all good. I also check from one side of the dtm plug to the other side an there all getting continuity for all four wires. Starting to loose my mind haha, could it be faulty canbus Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 With ignition off, if you unplug the CAN lambda and measure resistance across the CAN H/L pins in the DTM plug (ecu side) what resistance do you get? Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 119.5 resistance Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 Ok that is good and suggests there is continuity back to the CAN controller in the ECU. I notice you havent done twisted pair or a terminating resistor which would be more correct for a CAN bus, but still I havent seen that cause one not to be detectable before so we will forget about that for now. It might be worth a try to swap CAN H with CAN L, although it looks correct in your photos above, photos dont always show the full story so its worth a shot. Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 What do you mean I haven’t done a ‘twisted pair or a terminating resistor’ how do you do that I haven’t heard of that before. And I’ll give it ago I did try that a while back but no difference but that’s before I have changed things around. I’ll keep you updated Unfortunately I just swapped the pins over and still no luck. Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 CAN wiring is meant to be twisted with a 120ohm resistor at both ends of the bus. The ECU has one built in for the ECU end so you only need to add one at the far end. However - as I said earlier I doubt this is your problem, it can slow down comms and become more of an issue with a more loaded bus with lots of data on it but a single lambda is not sending much data. Are you definitely sure that sensor is still getting hot with just ign on, engine not running? Aidan99 1 Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 Is that a resistor on the can h and can l wire or just 1. it appears that the little black link can lambda unit is not getting hot anymore ? But it is receiving 12v ign power from the relay to it. Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 7, 2021 Report Share Posted January 7, 2021 29 minutes ago, Aidan99 said: it appears that the little black link can lambda unit is not getting hot anymore ? But it is receiving 12v ign power from the relay to it. Just the actual sensor should get hot, not so much the black box. And it will only heat if it is not getting a valid CAN signal from the ECU. If its getting a CAN signal it knows the engine is not running so wont heat up. So confirm again - is the sensor getting hot regardless of the CAN plugged in or not? Or is it only getting hot with the CAN unplugged? Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 7, 2021 Author Report Share Posted January 7, 2021 I have just checked the Bosch sensor an it’s getting warm with just ignition on That’s with the can plugged in Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 8, 2021 Report Share Posted January 8, 2021 Im running out of ideas. If its getting warm it still means it has power but no CAN. Can you attach your map again so I can take another look with fresh eyes. Quote Link to comment Share on other sites More sharing options...
Aidan99 Posted January 8, 2021 Author Report Share Posted January 8, 2021 that makes two of us, I am stumped! I have re plugged into CAN 1 on the ecu so i re set up the settings on can setup to CAN 1. 346100969_skylinebasemap2CANchanges (1).pclx Quote Link to comment Share on other sites More sharing options...
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