I got a G4+ ttlink pnp on my Audi A4.
I've wired a 150psi fuel pressure sensor to AN Volt 2 and assigned a calibration table and it is reading 155psi. Whilst unplugged I have 5v across the ground and 5v in and 0v across signal and ground. When I plug it in and back probe I'm getting 4.6v across signal and ground. I tested the same with a spare sensor and I'm getting the same result. Any idea as to what I'm doing wrong or could be the issue?
I've also got an AEM x series 150psi oil pressure gauge wired in to AN Volt 7 and this too is not reading correctly via the gauge and pclink, it just reads 11psi on gauge and 13.8psi on pclink. The instructions says white wire to analog input on ecu (AN volt 7?) and the BROWN wire must be connected to the negative of the analog input of the logging device orECU. If the logging device or ECU does not have a differential analog input (both a dedicated positive and negative terminal for the analog input) then connect the BROWN wire to the shared signal ground. If the device doesnot have a dedicated signal ground then as a last course ofaction, connect it to the power ground of the logging device.
I connected it to the power ground, could this be the issue? Thanks in advance!