TPS Sensor Voltage 17V

[Lacostas]

Hey all!

Been trying to track an annoying electrical issue on my 2.7 M9623 (2004) that has been nagging me for at least a year. Bought an iCarSoft POR 3.0 and here are the results:

1. No CEL/codes
   
2. Whenever there is extra load (i.e A/C ON, fans, lights), the Battery Voltage drops from normal 14.2 V to 13.2 and then it tries slowly to get back up (car shaking)
   
3. Same happens whenever there is no extra load on idle and i slightly press the gas pedal increasing the rpms by a bit.
   
4. Throttle Position Sensor 1 Voltage shows ±3V and Sensor-2 shows 17V. Their combined voltage seems to always be around 20V which seems extremely high(?)
   

Car has eGas, Battery is 3 monhts old. Remanufactured alternator a year ago and the issue persisted.

Thanks!

[JFP in PA]

Voltage regulator or failing diode; try running diode ripple diagnostics on the alternator.

[Lacostas]

Originally Posted by JFP in PA

Voltage regulator or failing diode; try running diode ripple diagnostics on the alternator.

Thanks for the input. The voltage is at 17V even with the engine off (igntion on) so i assume the alternator doesnt affect it much ?

Im leaning towards faulty ECU or faulty TPS (?) but not sure whats more common

[Beelzy]

Faulty ECU was the problem on my 04 base.