Hello and good day:
Originally Posted by BlastofRed
P0193 Fuel rail pressure circuit high input ....p0420 catalyst efficiency below threshold bank 1 any idea where to start? Thanks
The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM
) corresponding to pressure.
Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM
. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM
to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.
try this link for the p0420 catalyst efficiency below threshold bank 1
P0420 DTC Code - Catalyst System Efficiency Below Threshold (Bank 1)