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Old 10-30-2008, 02:52 PM   #1
FiFoci
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No fuel pressure

i got his code. my symtoms r described below.
how to i reset the Inertia fuel shutoff switch?

P1233 - Fuel System Disabled or Offline LS6/LS8:
For LS6/LS8, P1233 indicates the PCM is not receiving the fuel level information on SCP from the rear electronics module (REM). Refer to the Workshop Manual Section 413-01 for 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. Inertia fuel shutoff (IFS) switch needs to be reset
Open FPDM ground circuit
Open or shorted FPM circuit
Damaged IFS switch
Damaged FPDM
Damaged PCM
Also for Escort/Tracer and Mustang:
Open FPDM PWR circuit
Open B+ circuit to constant control relay module (CCRM) pin 11
Open ground to CCRM pin 18 (Mustang)
Damaged CCRM
Also for Continental:
Open VPWR circuit to FPDM
The PCM expects to see one of the following duty cycle signals from the FPDM on the FPM circuit: 1) 50% (500 msec on, 500 msec off), all OK. 2) 25% (250 msec on, 750 msec 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 msec ON, 250 OFF), the FPDM has detected a fault in the circuits between the FPDM and the fuel pump.


when i start my car i have only about 1-6psi fuel pressure just enough to keep it idleing. it will stay at 1-6 only until i move the car. when i move the car it will SLOWLY build psi up to 57 then drop and setle at 39 then it fine until i restart the car in the morning the next day.
the CEL didnt come on but i got this code P1233.
so my question is how to i reset the Inertia fuel shutoff switch?


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Old 10-30-2008, 07:29 PM   #2
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> how to i reset the Inertia fuel shutoff switch?

Page 168 of your owner's manual. For some reason I cannot copy from the PDF version of the manual.


If you do not have your manual, you can download one free from http://www.fleet.ford.com
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Old 10-30-2008, 07:54 PM   #3
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Button in the front passenger kick panel, remove a piece of plasit(if it still has it) Press the button
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Law of Mechanical Repair, After your hands become coated with grease, your nose will begin to itch and you'll have to pee.

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Old 10-30-2008, 08:30 PM   #4
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Question, if the pressure is there but very small, doesn't that indicate a clogged fuel filter ??? Kind make sense in my head...

Just brain storming!!

I thought of shut off switch too, but the pressure is there... hmm
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Old 10-31-2008, 04:46 PM   #5
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Perhaps it is like a half tripped breaker and only letting a small amount of voltage to the pump, therfore giving Little to no pressure
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Old 10-31-2008, 07:36 PM   #6
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> Perhaps it is like a half tripped breaker and only letting a small amount of voltage to the pump, therfore giving Little to no pressure


Not impossible, but a one in several thousand chance.

Low pressure, makes me think of (1) clogged fuel filter, (2) bad fuel pump/strainer in the fuel tank, (3) pressure sensor/regulator problem.
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Old 11-01-2008, 01:18 AM   #7
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i was able to reset it. so it was triggered some how??
but tonight i ran at the track and i kept losing fuel pressure at the top of 3 and the car would fall on its face (about 18psi) and some run it would hold about 36psi all the way to 7k my best time was a 15.8 at 86 and 16.1 when i lost pressure.
i used my x3 datalog for the fuel psi.
oh and i have an 03' pump in my 01 zx3...
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Old 07-08-2013, 12:29 AM   #8
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i also have no fuel pressure. where would be the best place to start? i hit a deer and tore up the body. i fixed the body work. i had to change out a radiator, A/C, timing chain cover, and alternator.

after all work is done i have no fuel pressure. anyone know a easy fix?
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Old 07-08-2013, 02:55 PM   #9
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anyone around?
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