just done some tests and measure the O2 Voltage (primary) on the Euro CTR EP3 PRA ECU and compare it with the PLX
wideband controller narrow band signal.
http://www.youtube.com/watch?v=NQS6M8OUoDA
both signals are 0 - 1V, so PLX narrow band simulation signal can be used with no problems for closed loop operation, and just use the single wideband O2 (PLX - Bosch LSU 4.2) on PRA ECU:
-- the wideband signal (0 - 5v) only for datalog purpose on PRA ECU conected via ELD pin E15 GRN/RED wire (ELD wire delete, ECU resistors R300 & R301 removed , and 0.1uF 50V ceramic capacitor filter)
-- the narrow band PLX controller conected via pin A6 RED wire (same pin as oem O2) with the oem sensor removed, 0.1uF 50V ceramic capacitor filter. here we have to simulate the original O2 heater resistance and it can be done by installing an 20 Ohm, 10 Watt load resistor to prevent the engine check error code , or just disactivate the code ( P0135 ) via Kmanager (parameters - closed loop)
** same ground must be use between ECU and wideband controller for best reference.
I had to use multimeters because on the PRA ECU (european etc) the O2v it can't be
logged via Kpro / kmanager.
in the video the setup is:
1. small voltmeter measures the PLX narrow band output signal
2. large voltmeter measures oem setul narrow band O2 signal
(note that the values are from very cheap multimeters and the setup needs further capacitor filtering for noise reduction not installed for the video)
in conclusion, yes the PRA ECU will work just fine in closed loop with the PLX narrow band voltage with the right setup.
hope it helps some PRA users :)