P0193 - Fuel Rail Pressure Sensor Circuit High Input (FRP)
The comprehensive component monitor (CCM) monitors the FRP sensor circuit to the PCM for high voltage. If voltage were to fall below a calibrated limit and a calibrated amount of time during testing, the test will fail.
A FRP PID value during KOER or KOEO less than 0.3 volts for gasoline or 0.5 volts for natural gas vehicles (NG) would indicate a hard fault.
P0193 All GO to DD7 GO to DD7 GO to DD16
DD7 DTC P0193: CHECK FUEL PRESSURE PID VALUE
Key on.
Access and monitor FRP V PID.
Is the FRP V PID voltage greater than 4.5 for NG and 4.8 for all others?
Yes No
KEY OFF.
For gasoline vehicles:
GO to DD8 .
For NG vehicles:
GO to DD9 . Fault is intermittent. GO to DD15
DD8 CHECK FUEL RAIL PRESSURE SENSOR FOR FUEL LEAKS
Remove vacuum hose from fuel rail pressure sensor.
Inspect sensor and hose for fuel.
Is fuel present?
Yes No
Note: Refer to the fuel system WARNING at the beginning of this pinpoint test.
REPLACE the fuel rail pressure sensor. GO to DD10 .
DD16 WIGGLE TEST THE FRP SENSOR CIRCUIT WHILE MONITORING FRP PID FOR SUDDEN VALUE CHANGE
Access FRP V PID.
While monitoring FRP V PID, tap on the FRP sensor; then wiggle the wiring while looking for sudden changes in the PID voltage as an indication of an intermittent fault.
Is a fault indicated?
Yes No
REPAIR as necessary. Unable to duplicate/identify fault at this time. GO to Z1 .
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Fuel pressure outside nominal range. Check pressure at fuel rail.
SOURCE: 1999 mustang won't start. Good battery, good
Engine doesn't crank over ? Or cranks over an no start ? If you have a no crank issue when you turn the key , do you have a security light flashing In the top center of the dash panel ! This is part of the PATS - passive anti-theft system ! If there is a problem the computer will disable the starting system !
PATS uses a visual theft indicator. This indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS problem, this indicator will either flash rapidly or glow steadily (for more than three seconds) when the ignition switch is turned to RUN or START. PATS also "blips" the theft indicator every two seconds at ignition OFF to act as a visual theft deterrent.
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