Raul Herrero Posted May 17, 2021 Report Share Posted May 17, 2021 Hi there i am doing an installation for a EGT sensor with amplifier in a G4x. The Amplifier has 3 wires, power, ground and signal, and also the shield. My question is... i assume the system will be at sensor ground instead of chassis ground...but what do i need do with the Shield? connect the shield to sensor ground also, or chassis ground or leave it ? l sold another of that amplifier to a customer and sensor is reading good with is outside the manifold, but when he conects the sensor to the manifold, (and obviously, chassis ground) the sensor reads 0. Something with the shield would be wrong or may be with ground but i want to be sure the best way to avoid more problems like this Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 17, 2021 Report Share Posted May 17, 2021 It is not a wiring problem, you have purchased the wrong type of thermocouple. It sounds like you have a grounded tip thermocouple, they have the outer sheath connected to the measurment junction and need an amplifier circuit that is designed for it. Most automotive amplifiers need the non-grounded or exposed tip type. To answer your question about grounding - the amplifier ground should be connected to senor ground, I would not bother with connecting the shield for a slow moving 0-5V signal, but if you want to connect it the easiest option is to slice it to the same sensor ground. Note from Texense's datasheet: Quote Link to comment Share on other sites More sharing options...
Raul Herrero Posted May 21, 2021 Author Report Share Posted May 21, 2021 Thanks Adam I will try to remove the ground from ecu and see what happens. Quote Link to comment Share on other sites More sharing options...
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