RPS(Rail Pressure Sensor), consists of piezzo electric element, measures rail pressure inside of common rail.
ECM determines optimum fuel injection quantity at specific engine condition based on RPS signal. RPS signal is also used as rail pressure regualtor feed back signal in order to achieve optimum rail pressure at certain engine condition.
P0192 is set when RPS output voltage is below the minimum value of 0.254V for more than 0.2 sec.. This code is due to the open in power circuit or the short to ground in signal circuit.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Voltage monitoring(Voltage below lower limit)
? RPS circuit
? RPS component
Enable Conditions
? Engine running
Threshold Value
? Output sinal below minimum value (below 0.254V)
Diagnostic Time
? 0.2 sec.
Fail Safe
Fuel Cut
NO
EGR Off
Fuel Limit
YES
Check Lamp
Fig.1) APS 1 and RPS signals are measured simultaneously.
This waveform shows the rise of RPS output voltage at rapid acceleration.