ken1436215443 Posted May 19, 2014 Report Share Posted May 19, 2014 I been having so much problem using aem sensors (5 bar map, 150 PsiG sensor for fuel pressure log ect...) the LINK G4 would show it at 5v even when engine is off with IGN on. I change out 3 map and 2 pressure sensor so far with the same result. with both type of sensor. Im 100% sure my cal table is correct. This only happen with aem sensor GM Map sensor work flawless. And once the sensor read 5v with my link g4 ecu the sensor is permanently bad it will always read 5 volt even with other ecu.... Quote Link to comment Share on other sites More sharing options...
Steve1436215419 Posted May 20, 2014 Report Share Posted May 20, 2014 Different wiering between the sensors? Quote Link to comment Share on other sites More sharing options...
Simon Posted May 20, 2014 Report Share Posted May 20, 2014 The ECU is detecting the voltage is at 5V on the input pin for that volt channel. You can double check this with a volt meter at the ECU or sensor on the signal wire. If its reading 5V then the wiring is incorrect or the sensor is dead. Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted May 23, 2014 Author Report Share Posted May 23, 2014 im 100% sure that the wiring is correct. the sensor is good it work fine with my other car. the ecu see 5v only when i plug the sensor in  the harness. Quote Link to comment Share on other sites More sharing options...
Simon Posted May 26, 2014 Report Share Posted May 26, 2014 Check the error settings on that volt input. If these are messed up it could cause this error. Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted May 27, 2014 Author Report Share Posted May 27, 2014 anV 4 high is 4.95V anV 4 low is .05V error valve is 100kPa can i use any other brand of sensor to log my fuel pressure? for some reason i can not use any of aem sensor Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted May 27, 2014 Author Report Share Posted May 27, 2014 cal table is input A .5V                     input B 4.5V                    kPa                     output A 100 kPa                     output B 1134 kPa Quote Link to comment Share on other sites More sharing options...
Simon Posted May 27, 2014 Report Share Posted May 27, 2014 If the AEM sensor has a 0-5 output there should be no issue using it. We would however normally recommend a TI sensor (but they are relatively expensive) If you disconnect the sensor signal from the ECU and measure with a volt meter do you see 5 volts or something different? Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted May 29, 2014 Report Share Posted May 29, 2014 I run the AEM 150 psig sensor for my fuel pressure and oil pressure indication. You really need to make sure the +5v and analog out wires aren't swapped on the AEM sensor compared to the stock one. Other than that there is no reason it shouldn't work. Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted June 6, 2014 Author Report Share Posted June 6, 2014 disconnect the signal wire from ecu with sensor plug in i see 5 volt from the signal wire. Im assuming the sensor is bad? but it work fine on my other car. 5 volt power wire to signal wire from ecu i see 1.2 volt sensor is not plug in Quote Link to comment Share on other sites More sharing options...
Simon Posted June 9, 2014 Report Share Posted June 9, 2014 With no sensor plugged in the input wire to the ECU should slowly drop to ground (0Volts) Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted July 2, 2014 Author Report Share Posted July 2, 2014 with no sensor plugged in i get 3.5 volt from the signal that coming out from to the ecu. Im getting ground from that signal wire that coming out from the ecu. Also my sensor ground has continuity with the engine ground is this normal? Quote Link to comment Share on other sites More sharing options...
Simon Posted July 2, 2014 Report Share Posted July 2, 2014 3.5volts on the signal wire is not normal if the sensor is unpluged. Assuming this voltage is not dropping off. Double check you have the correct input wire to the ECU, do not trust the wire color check the location at the ECU header. Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted July 2, 2014 Author Report Share Posted July 2, 2014 yes i just double check and it the right wire an volt 3. I have no clue why it reading 3.5 volt without a sensor plug in. Just to test it i put one of my volt meter lead on the car battery positive and signal wire i get about 8 volt. I dont know what feeding it getting ground. Quote Link to comment Share on other sites More sharing options...
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