Originally posted by CrankyCrankPot:
543 - Fuel Pump Circut
P0543??? I don't see no stinkin' P0543!  Do you mean P0453 (Fuel Tank Pressure Signal circuit Input above maximum)? If so, then the following is from the Ford TSP: HX33 DTC P0453: CHECK FOR HIGH FTP SENSOR VOLTAGE
Diagnostic Trouble Code (DTC) P0453 indicates that Self-Test has detected a FTP circuit input above the maximum.
Possible causes:
-- FTP open.
-- FTP short to VREF or VPWR.
-- VREF shorted to VPWR.
-- SIG RTN open.
-- Damaged FTP sensor.
-- Damaged PCM.
* Key off.
* Connect scan tool.
* Key on, engine off.
* NOTE:
FTP sensor input with no pressure/vacuum on the fuel tank (fuel filler cap open or not open to atmosphere) is 2.37 to 2.97 volts.
Access FTP V PID.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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