Vitaakas Posted July 12, 2022 Report Share Posted July 12, 2022 I have Link G4+ ECU and installed Link NTC1-8 temperature sensor in my Mitsubishi GTO. But the ECT reading is incorrect. When the car is cold, it looks fine. It goes up to around 70C and then drops to 50-55C and stay the same value... In ECT calibration section I have selected Link NTC1-8 sensor, also tried all different options. Non is showing correct temperature. Please, help! Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 12, 2022 Report Share Posted July 12, 2022 Your software setup looks correct. This is what I do when I have a doubt about a temp sensor: Remove senor from engine, plug back into harness. Connect laptop. Take a kettle of freshly boiled water out to the car and drop the senor in. It should read somewhere around 90deg C. Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 13, 2022 Author Report Share Posted July 13, 2022 I have used 3 different sensors and they are all working (tested, ohms are changing). Picture ETC1: sensor in engine. Temperature was rising to around 65C and then suddenly dropped to 52C... Picture ETC2: sensor in kettle. The same situation. Temperature was rising to around 70C and then suddenly dropped to 54C... Any other options? Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 13, 2022 Report Share Posted July 13, 2022 Sounds like possibly a bad ground or something and there is current passing though the temp sensor ground when some other device turns on. Can you rig it up with some temporary wiring or jumper leads etc direct to ecu, bypassing original wiring. Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 13, 2022 Author Report Share Posted July 13, 2022 I have checked voltage it goes up and down sable. Voltage range from 3V (cold) to 0.9V (hot). There should be something not right in my settings. But I can't find it... Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 13, 2022 Author Report Share Posted July 13, 2022 One more test. Created my own calibration table. All the same. Goes up and then at some point drops down. Set 100C at 1V. But when 0.93V, ECT shows 55C... Quote Link to comment Share on other sites More sharing options...
remski2 Posted July 13, 2022 Report Share Posted July 13, 2022 If you have logged your tests.. post the map and log file here.. maybe there is something there that would help. Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 14, 2022 Author Report Share Posted July 14, 2022 Attached PC Datalog - 2022-07-14 8;48;56 am.llgx map.pclx Quote Link to comment Share on other sites More sharing options...
remski2 Posted July 14, 2022 Report Share Posted July 14, 2022 This log looks good.. Seems like you dipped the sensor for 10sec and this was reflected in the smoot temp rise.. Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 16, 2022 Author Report Share Posted July 16, 2022 No it is not good. There is always big drop down at some point (70-80C) and it drops to 50-60C as you can see in the picture. And then temperature is not changing... Also, I have tested with tester the voltage. It is going down stable, so the sensor is definitely is good. I have marked yellow. At that time sensor always was in the kettle. Please, help. Why at 70-80C drops down to 50-60C and freeze... Quote Link to comment Share on other sites More sharing options...
remski2 Posted July 16, 2022 Report Share Posted July 16, 2022 Oh.. I assumed this was the time when you pulled the sensor out but seems you never did. I'd check wiring.. loose connectors ? Check ground... run a test with separate leads to the ECU. One more thing.. can you post a pic of your ECT sensor ? Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 18, 2022 Author Report Share Posted July 18, 2022 https://www.ebay.co.uk/itm/112372548630 I thought my original Mitsubishi GTO sensor is bad, so I bought this one (Link ECU G4+ G4X ECU 1/8 BSP Coolant Temp Temperature Sensor (NTC1-8)). But the same problem occurred. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 18, 2022 Report Share Posted July 18, 2022 On 7/13/2022 at 10:41 PM, Adamw said: Sounds like possibly a bad ground or something and there is current passing though the temp sensor ground when some other device turns on. Can you rig it up with some temporary wiring or jumper leads etc direct to ecu, bypassing original wiring. Did you try this yet? Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 18, 2022 Author Report Share Posted July 18, 2022 Both wires connected direct to the sensor... Still the same problem. Could be a faulty ECU? Quote Link to comment Share on other sites More sharing options...
Vitaakas Posted July 18, 2022 Author Report Share Posted July 18, 2022 Tried two different sensors. Connected direct wires from ECT sensor to ECU. Check this video: https://youtu.be/crHMYPVcUB8 Voltage is changing stable on ECU and my Voltmeter, but ECT is not updating... In the video (3sec) ECT updating 2.6V - 47C. Still, all is OK. But in 27sec 1.7V should be about 95C and it showing just 67C... ECT is not updating anymore. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 18, 2022 Report Share Posted July 18, 2022 11 hours ago, Vitaakas said: But in 27sec 1.7V should be about 95C and it showing just 67C... ECT is not updating anymore. 67DegC is correct for 1.7V. Quote Link to comment Share on other sites More sharing options...
Confused Posted July 19, 2022 Report Share Posted July 19, 2022 Have you tried disconnecting everything from the ECU other than main power, main ground, your An Temp input and sensor ground? Remove all other possibilities from the equation. If that's all good, then start adding back things one at a time, and you'll probably find a fault with something else. Quote Link to comment Share on other sites More sharing options...
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