Ok, I have the lean running 2014 which we will call “A”. The good running 2014 which we will call “B” and I threw in my 2013 which we will call “C”.
I first made sure all three batteries were fully charged so that all voltage tests would be consistent.
I tested the fuel pressure and volume with the following results.
A—46.0 psi B—45.8 psi C— 46.1 psi All three produced a volume of one pint in 30 seconds.
I tested the fuel injectors with an FI tester that pulsed each injector for 50ms. All three dropped the same amount of fuel pressure on the gauge.
The TPS displayed identical readings on all three. The Pod showed 17 at closed throttle and 99 at wide open throttle. This is in percentage of opening.
The voltages were .007 closed throttle and 4.0 wide open. I would recommend using voltage when adjusting the TPS as the pod update rate is slow.
The best way to test the temperature sensors (Intake air and coolant) is after the engine has cooled down completely. Preferably overnight.
All of the sensors tested at 2.6 volts. Using The SAE chart that translates to 77 degrees Fahrenheit which is exactly what the temperature gauge on the wall of my garage displayed. If one sensor deviates from ambient temperature, you will know that it is out of range.
I tested the Intake air Pressure sensor with the key on engine off. I had the following results.
“A”—3.4 to 3.6 volts “ B”—3.6 volts “C”—3.6 volts
The values received with key on an engine off tell the ECM the altitude where it is being operated. (Baro information). It is obvious that we have a problem here because of the varying voltage on “A”. I am accustomed to seeing 4.7 to 4.8 at my altitude of 150 ft above sea level. See below. The change in voltage on “A” is most likely telling the ECM that it is at a much higher altitude.
The 3.6 volts must be correct however, I don’t have anything to give me their operational strategy. I am going to do more research and testing on this circuit. I will get back with the results.
Does anyone have an old air pressure sensor that I could take apart and check the circuitry?
