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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline) >> Diagnostic Trouble Code (DTC) Charts >> P1233 - Fuel System Disabled Or Offline

P1233 - Fuel System Disabled Or Offline

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P1233 - FUEL SYSTEM DISABLED OR OFFLINE

Description:  LS6/LS8 and Thunderbird:
  • For LS and Thunderbird, this DTC indicates the PCM is not receiving the fuel level information on the communication link from the rear electronics module (REM). REFER to the appropriate MODULE COMMUNICATIONS NETWORK article for REM self-test/diagnostics.

All Others:
  • The PCM monitors the fuel pump monitor (FPM) circuit from the fuel pump driver module (FPDM). With the key on, the FPDM continuously sends a duty cycle signal to the PCM through the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal.
Possible Causes: 
  • Inertia fuel shutoff (IFS) switch needs to be reset.
  • Open FPDM ground circuit.
  • Open circuit to FPDM PWR RLY.
  • Open FPDM PWR circuit.
  • Open or shorted FPM circuit (engine should start).
  • Damaged IFS switch.
  • Damaged FPDM PWR RLY.
  • Damaged FPDM.
  • Damaged PCM.
  • Also for Mustang:
  • Open B+ circuit to the constant control relay module (CCRM) pin 11.
  • Open ground to CCRM pin 18.
  • Damaged CCRM.
Diagnostic Aids:  The PCM expects to see one of the following duty cycle signals from the FPDM on the FPM circuit: 1) 50% (500 ms on, 500 ms off), all OK. 2) 25% (250 ms on, 750 ms off), FPDM did not receive a fuel pump (FP) duty cycle command from the PCM, or the duty cycle that was received was invalid. 3) 75% (750 ms ON, 250 OFF), the FPDM has detected a fault in the circuits between the FPDM and the fuel pump.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
LS, Thunderbird Go to the appropriate MODULE COMMUNICATIONS NETWORK article for REM (Rear Electronics Module) self-test diagnostics. Go to the appropriate MODULE COMMUNICATIONS NETWORK article for REM (Rear Electronics Module) self-test diagnostics. Go to the appropriate MODULE COMMUNICATIONS NETWORK article for REM (Rear Electronics Module) self-test diagnostics.
All Others GO to KB: Fuel Pump Driver Module STEP 1 GO to KB: Fuel Pump Driver Module STEP 1 GO to KB: Fuel Pump Driver Module STEP 1
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