Ford antitheft

[wayne petty]

after paging through the az site..
Fig. Component Location Views, Page 45 (2001)

http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0996b43f/80/23/d5/3d/large/0996b43f8023d53d.gif




this is the section i found it in...


http://www.autozone.com:80/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f8036e1c7


here i think is the fuel pump circuit...

http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0996b43f/80/23/d5/aa/large/0996b43f8023d5aa.gif

according to the info printed on the diagram...


sorry if i mislead you .. but the ford parts did not show a fuel pump relay.. only the module.. my friend said they had a fuel pump driver module....  

only the wiring diagrams showed the relay....

i don't have an alldatadiy.com or eautorepair.net  subscription on that model..... only the AZ free stuff..

[jaybee]

Thanks!  Figures, the diagram in the manual I have showed the fuel pump relay in the wrong position.  

As for the FPDM it appears to be right next to the trunk floor, clear to the right side.  I don't see how there's room for it in that location, but there's still a plastic panel over it so I'll remove that one as well.  By now that would literally be the ONLY piece that I haven't pulled.

[wayne petty]

Gasoline Engine Electronic Returnless Fuel System

Operation and features of the ERFS are as follows:

1. The fuel delivery system is enabled during crank or running mode after the PCM receives a crankshaft
position (CKP) sensor signal.

2. The fuel pump logic is defined in the fuel system control strategy and is carried out by the PCM.

3. The PCM commands a duty cycle to the Fuel Pump Driver Module (FPDM).

4. The FPDM modulates the voltage to the Fuel Pump (FP) to achieve the proper fuel pressure. Voltage for the
FP is supplied by the power relay or FPDM power supply relay.

5. The Fuel Rail Pressure (FRP) sensor provides the PCM with the current fuel rail pressure data. The PCM uses
this information to vary the duty cycle output to the FPDM to compensate for varying loads.

6. The volume of fuel injected is controlled by the length of time the fuel injector is held open. The injector is
normally closed and is operated by 12-volt VPWR from the power relay. The ground signal is controlled by
the PCM.

[wayne petty]

you did not say that you had an codes... i looked this possible codes up ...


P1232
Low Speed Fuel Pump Primary Circuit Malfunction
Detailed Description
The PCM monitors the low speed fuel pump (LFP) primary circuit output from the PCM. The test fails if: When the LFP circuit is commanded on (grounded), excessive current draw is detected on the LFP circuit; or when the LFP circuit is commanded off, voltage is not detected on the LFP circuit (the PCM expects to detect VPWR voltage coming through the low speed fuel pump relay coil to the LFP circuit).
Possible causes :-
Open or shorted low fuel pump (LFP) circuit.
Open VPWR to low speed fuel pump relay.
Damaged low speed fuel pump relay.
Damaged PCM.

Diagnostic Aids
An open circuit or short to ground can only be detected with the low speed fuel pump.
A short to power can only be detected with the low speed fuel pump commanded on.
During KOEO and KOER Self-Test, the low speed fuel pump output command will be cycled on and off.


P1233
Fuel System Disabled or Offline
Detailed Description
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.
Possible causes :-
Inertia fuel shutoff (IFS) switch needs to be reset.
Open FPDM ground circuit.
Open or shorted FPM circuit (engine should start).
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.

Diagnostic Aids
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.



P1234
Fuel System Disabled or Offline
Detailed Description
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.
Possible causes :-
Inertia fuel shutoff (IFS) switch needs to be reset.
Open FPDM ground circuit.
Open or shorted FPM circuit (engine should start).
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.

Diagnostic Aids
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.


P1235
Fuel pump control out of range
Detailed Description
Note: For LS6/LS8, the FPDM functions are incorporated in the Rear Electronics Module (REM). Also, the REM does not use a FPM circuit. Diagnostic information will be sent through SCP. Indicates that the FPDM has detected an invalid or missing FP circuit signal from the PCM. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received.
Possible causes :-
FP circuit open or shorted.
Damaged FPDM.
Damaged PCM.

Diagnostic Aids
The FPDM sends a 25% duty cycle (250 msec ON, 750 msec OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PDM will return to sending an "all OK" (50% duty cycle) message to the PCM. The PCM will keep P1235 stored in Continuous Memory.


P1236
Fuel pump control out of range
Detailed Description
Note: For LS6/LS8, the FPDM functions are incorporated in the Rear Electronics Module (REM). Also, the REM does not use a FPM circuit. Diagnostic information will be sent through SCP. Indicates that the FPDM has detected an invalid or missing FP circuit signal from the PCM. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received.
Possible causes :-
FP circuit open or shorted.
Damaged FPDM.
Damaged PCM.

Diagnostic Aids
The FPDM sends a 25% duty cycle (250 msec ON, 750 msec OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PDM will return to sending an "all OK" (50% duty cycle) message to the PCM. The PCM will keep P1235 stored in Continuous Memory.


P1237
Fuel Pump Secondary Circuit Malfunction
Detailed Description
Note: For LS6/LS8, the FPDM functions are incorporated in the rear electronics module (REM). Also, the REM does not use a FPM circuit. Diagnostic information will be set through SCP. Indicates that the FPDM has detected a fuel pump secondary circuit fault. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received.
Possible causes :-
Open or shorted FP PWR circuit.
Open FP RTN circuit to FPDM.
Open or shorted circuit in the fuel pump.
Locked fuel pump rotor.
Damaged FPDM.
For LS6/LS8, circuits associated with the Fuel Pump relay.

Diagnostic Aids
The FPDM sends a 75% duty cycle (750 msec ON, 250 msec OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PCM will return to sending an "all OK" (50% duty cycle) message to the PCM. The PCM will keep P1237 stored in Continuous Memory.
The FPDM controls pump speed by supplying a "variable" ground on the RTN circuit.


P1238
Fuel Pump Secondary Circuit Malfunction
Detailed Description
Note: For LS6/LS8, the FPDM functions are incorporated in the rear electronics module (REM). Also, the REM does not use a FPM circuit. Diagnostic information will be set through SCP. Indicates that the FPDM has detected a fuel pump secondary circuit fault. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received.
Possible causes :-
Open or shorted FP PWR circuit.
Open FP RTN circuit to FPDM.
Open or shorted circuit in the fuel pump.
Locked fuel pump rotor.
Damaged FPDM.
For LS6/LS8, circuits associated with the Fuel Pump relay.

Diagnostic Aids
The FPDM sends a 75% duty cycle (750 msec ON, 250 msec OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PCM will return to sending an "all OK" (50% duty cycle) message to the PCM. The PCM will keep P1237 stored in Continuous Memory.
The FPDM controls pump speed by supplying a "variable" ground on the RTN circuit.


P1260
Theft Detected - Vehicle Immobilized
Detailed Description
Indicates that the passive anti-theft system (PATS) has determined a theft condition existed and the engine is disabled. This DTC is a good indicator to check the PATS for DTCs.
Possible causes :-
Previous theft condition.
Anti-Theft System failure.

Diagnostic Aids
Theft indicator flashing rapidly or on solid when ignition switch is in the ON position. Check anti-theft system for DTCs. Typical vehicle symptoms are: Start/Stall or Crank/No Start. NOTE: No crank symptom only on vehicles equipped with PATS starter disable feature.

[jaybee]

Sometimes using generic information that applies to multiple model years poses a challenge...latest update;

This one doesn't use a fuel pump driver module.  It uses a mechanical pressure regulator that's at the pump.

Now that I know WHICH relay is supposed to trigger the fuel pump I've checked it out.  The socket is live when it's supposed to be, the relay checks out fine.  Turning the key to the 'on' position it energizes for a couple of seconds, then shuts off.

The wiring harness dives up into the left front fender, nothing goes toward the engine where I did the rest of my work.  That helps end my fear that it's a wire left disconnected, which lingered even though I've checked the whole engine compartment repeatedly for hanging plugs.

All of this jibes with one of the wiring diagrams you showed me...the simplest one with power, relay, pump, trigger from the PCM and pump voltage verification to the PCM.

I guess that means it's time to drain and drop the tank.

[wayne petty]

take the cover off the relay...    squeeze the contacts closed with your fingers or a screw driver... see if the fuel pump stays powered up and spinning..

the fuel pump only runs for 2 seconds when you turn on the key.. and runs while cranking... and continues to run when the engine is running..  but if the engine stops... the fuel pump stops...


i just had a 90 ranger... in tank pump.. that the perforated inlet screen was totally clogged with the  filter sock internal media... preventing enough fuel to run the motor...


and.. have fun with the gas tank on that one..

be sure to have the car jacked up even on both ends..    i don't recall if the exhaust has to come off to drop the tank..  but its NOT easy to drop the tank..

[UGLY OLDS]

For what it's worth ... The easiest way to a regular cab Ranger fuel pump is 6 bed bolts ..One wire harness & a "Healthy" friend ...It takes about a half hour to loosen the bed & move it back 12" ...    You will find the fuel pump right where the front bed rail just was on the left side ....  
"Extended cab's" not so lucky ....It's under the cab...... :cry:  :cry:

Oh ....After you replace the fuel pump...Put a piece of sheet rubber ,
(inner tube works GREAT   ) , over the new pump & secure it with cable ties ...Seems the left front bed drain is EXACTLY over the fuel pump .........  


Bob.....

[wayne petty]

nope.. at least on the extended cab in the 90 ranger xlt..  it was under the bed also....

the pain was the bed bolts were rusted under the truck.. the strength and springyness of the bolts made it a chore to get them out..

one of the back bolts required 2 new T45 bit sockets and over an hour.. as i was using my 24 inch breaker bar.. and could only get about an eighth of a turn at a time...   it was like one using one of the torque sticks.. it kept breaking loose a fraction at a time after putting about a quarter turn into it..

but it came off.