Dantical Posted May 2, 2020 Report Share Posted May 2, 2020 HI, I have some Questions regarding the LSU 4.9 Wiring into my thunder. 1st - How much current is drawn by the heater ? ( for Fuse and wiresize ) 2nd - which wires should be shielded? at least the 5V Signal wire should be shielded, Right ? which one is it ? Have all to be shielded beside the heater? If yes, can all be run within the same Shielded cable ? 4 Wires in a cable where ALL wires are shielded together - not every single one - but all together. … thank you .. Bosch LSU 4.9 pin Wire colour Notes 1 Red Connect to ECU pin APE (Fury & Thunder) 2 Yellow Connect to ECU pin IPE (Fury & Thunder) 3 White Connect to ECU pin HEATER (Fury & Thunder) 4 Grey Connect to ignition switched +12V 5 Green Connect to ECU pin MES (Fury & Thunder) 6 Black Connect to ECU pin RE (Fury & Thunder) Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 2, 2020 Report Share Posted May 2, 2020 None of them need to be shielded the signals are current based so not particularly sensitive to noise or voltage drop. I believe they can pull up to about 6A for a short time under specific conditions but it is rare to ever see more than about 3A on the two heater wires. Typical working current is 1-1.5A. I typically use 20AWG for the heater and 22AWG for the others for a typical <2M long loom. Quote Link to comment Share on other sites More sharing options...
psedog Posted May 2, 2020 Report Share Posted May 2, 2020 I just plugged in a LC-2 (w/ LSU4.9) into a 12v 2amp power brick and it warmed up no problem. (I did this to calibrate and test before wiring it up in the car.) This was in a 25C / 77F room. Obviously when it's colder it'll require more amperage. At least for the LC2, the documentation says it can draw a max of 3 amps. Quote Link to comment Share on other sites More sharing options...
Richard Hill Posted May 2, 2020 Report Share Posted May 2, 2020 On 9/12/2019 at 11:00 PM, Richard Hill said: Here are some measurements from a single 4.9 Lambda sensor running on a Thunder on the bench. The maximum the sensor drew was 1.43A at the end of the heating phase HTH, Richard. Quote Link to comment Share on other sites More sharing options...
Dantical Posted May 2, 2020 Author Report Share Posted May 2, 2020 thank you all! I just wondered because Toyota Shield their o2 wires,.. thank you ! so no shielding requiered! Quote Link to comment Share on other sites More sharing options...
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