RPS(Rail Pressure Sensor) used to transmit to the ECM the pressure value for the rail. The rail is a high pressure accumulator. In order to output a voltage signal to the ECM which is directly proportional to the applied pressure, the rail pressure sensor must measure the instantaneous pressure in the rail. The fuel flows to the rail pressure sensor through opening in the rail, the end of which is sealed off by the sensor diaphram. Pressurized fuel reaches the sensor’s diaphram through a blind hole. The sensor element (semi conductor device) for convertering the pressure to an electric signal is mounted on this diaphram. The signal generated by the sensor is inputted to an evaluation circuit which amplifies the measured signal and sends it to the ECM. This value is used in calculating the flow and injection advance. In case of RPS failure, the engine symptoms will occur the running engine stall and the starting impossible.
If the RPS is extremely low or high during two driving cycles, these codes will be set. If the ECM is reading an uncharacteristic RPS supply voltage as compared to the RPR position and engine load during driving cycles, this code will be set. The MIL will be turned on.
DTC NO.
Detecting Condition
Possible Cause
P 0191
P 0192
P 0193
P 0194
? P 0191
? Output signal < 313 mV after the ignition switch OFF and 2.2 seconds.
? Output signal > 1203 mV after the ignition switch OFF and 2.2 seconds.
? P 0192 : Output signal < 180 mV
? P 0193 : Output signal > 4.8 V
? P 0194 : Error is recognized unless the sensor supply voltage is from 4.7 to 5.1V
? Engine Condition : RUN
? Fuel Limit : YES
? Fuel Cut : NO
? EGR OFF : NO
? MIL : YES
? LIMP HOME MODE
? Rail pressure is fixed value of 400 bar by ECM
? Engine shut down
? Starting impossible
? Open or short in circuit
? Rail pressure sensor
? ECM
RPS
Normal Parameter
Engine idle state after engine warming up
Fully Open Position
Rail Pressure
220 ~ 320 bar (22 ~32 Mpa)
1500 bar (150 Mpa)
Signal votage
Below 1.7 V
approx. 4.5V