Question about 1994 Ford Crown Victoria

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Car cranks good, fuel pump works only if I jump 12V to the inertial switch. Relay and fuses are good, I get gas pressure to the fuel rail but get no spark. Can my PCM be bad?

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Che ck the amplifier in the distributor

Posted on Jul 18, 2010

  • hauchucamtn1 Jul 18, 2010

    batery might be shot. will it hold a charge.

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1 Answer

How do you fix a suzuki liana when the fuel is not pumping through to motor? Is there a reset butto.n?


no year stated.
posted 3 times. as 3 problems.
no country stated, we dont have these here
ours are called Aerio's
what engine? per list.?????
1.3 L I4; 1.5 L I4; 1.6 L I4; 1.8 L I4; 2.0 L I4; 2.3 L I4; 1.4 L Diesel I4



no there is no reset. its not a ford or isuzu.
how to repair cars dead engine, varies by country and engine
not one stated. here.
here ill make a generic GAS/petrol list for you (lacking country or engine)
1: check the fuses.
2: turn key ,CEL lamp in cluster on? Yes/no.?
yes, good
no fuses blown..
3: look again in the cluster, did the IMMO lamp come on? (some countries the lamp looks like key with a red bar crossing it)
this lamp must not stick on or flash, or IMMO is unhappy. (immoblizers)
4: ok CEL ON, IMMO off, does it crank fast the starter motor? if not say so.
5: good it cranks?
yes, then do you have spark>? on all cylinders?
yes, good, no scan it. OR NO ITS A DIESEL>??>??
6: Ok i got spark (if gas engine)
7: lets say the spark is weak, ever do a tune up?
7b: lets say spark timing is way off. ever replace the cam belt>????
8: spark is good. must be fueling issues.
be advised that if PCM sees spark bad it does cut all fueling by design and laws...
9: now i use test fuel, and it runs.
yes runs. for 3seconds good.
no, see 1 to 8 above or compression is bad.
yes, the check fuel pressure. good?
no fuel pressure is 0 psi
so i check for 11-12v at the pump wires. cranking
you need to crank the engine because 1/2 the cars
made only run pump cranking, and all do running.

1 question ever turn the car up ever
or do the 60k mile or100km service list? "points"

Jun 13, 2015 | Suzuki Liana Cars & Trucks

1 Answer

Hello, how do I reset the fuel shut off switch on 1997 TJ 4 cylinder. 1997 jeep


its not a FORD, why would you thing a jeep is a ford?
is stock car , USA stock car (we are USA forum, )
then this book cover all that. its called the FSm.

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

ever wire, every bit,

why assume it has an inertial switch. ?
here is the truth.
  1. check all fuses first, (using a meter, no guessing)
  2. check fuel pressure, ah 0psi cranking,
  3. Check engine light must glow key or PCM is dead. (fuses)
  4. I check voltage at fuel pump relay output, its 0v cranking
  5. bad relay or PCM sees no spark.
  6. got 12v there, but not at pump cranking, bad wire .connector on way to pump.
  7. if 12vdc at actual pump and dead pump that is a bad pump. (0psi pressure)

Mar 09, 2015 | 1997 Jeep Wrangler

1 Answer

Fuel pump troubleshooting


First check the fuses... with a volt meter.. don't just look at them.. When you turn on the key the ign switch powers up the computer... .. The computer sends a single to a relay.. the relay comes on for 1.5 seconds when you turn the key to on to charge the system.. after you crank it for a few turns the fuel pump come on to keep the engine running. Turn the key to on and listen for that 1.5 sec. pump run.. if you have to go under the car and have somebody else turn the key.. if you hear it running then the fuel pump runs.. if you do not hear it run check that the ign switch is sending power to the acessories/computer. then check the relay to see if it is operating when you turn the key to on.. listen to it and touch it.. yyou should be able to hear it and feel it click. Just because the pump is running does not mean that it is pumping...so the next step is to hook up a pressure guage to the fuel rail and see if there is any pressure. (Harbor freight tools if you do not have one) You can jump the pump with a 12v wire.. jump it at the pump connector on top of the tank. if it runs check the fuel pressure.. if there is none.. or very little the pump is bad.. or the fuel filter is clogged.. or the pick-up filter in the tank attached to the pump is clogged.

Jul 20, 2014 | 2001 GMC Jimmy

1 Answer

2001 suzuki esteem wagon


1.6L or 1.8L vastly different engines... and EFI.
fuel to the rail , only means the pump is active , never good.
28PSI is minimum on all cars. 1psi will never start a car. ever
and the rail will shoot fuel, all day. it fruitless , unless the rail is dead.
see?
First the laws of EFI. (works all gas EFI)
  1. all fuses good.
  2. 12vdc to EFI system , below 10v is bad. (see lamps dim? bingo)
  3. The PCM (EFI brain) will never inject if it sees CMP/CKP or spark primary dead. ever. so, spark is first.
that is double reasons, fuel cant burn if no spark and if ECU
thinks spark is bad it cuts fuel, (fire safety and fuel hydralocking reasons)

so you connect any scan tool to the DLC, OBD2 port , by knees.
and crank for 5 seconds, release key, no turn off
see DTCs (errors) for CMP, or CKP sensors (cam/crank?)
bingo
no, then you crank and look at the RPM PID , live data stream the scan tool, see RPM go to 250rpm cranking, good.
ok , PCM thinks all is good....

i then check the #1 injector with a NOID lamp
i crank it flashes, good.
if not , i do all injectors , if one fails the pcm is dead on this line.
if yes, all dont flash the PCM is seeing some gross errors. ask. why./?
if all flash, then the fuel rail is dead. and your rail test was useless.

until you discloses engine option (size) I cant give spec numbers.
i then connect my fuel pressure gauge $20 tool to the fuel rail test
port, and i get 10psi, FAIL
i check voltage to the fuel pump cranking, i get 8v, bingo bad wiring
or bad fuel pump relay.
say 10psi and 12v at pump cranking,
the pump is bad, or the filter clogged , or the fuel pressure regulator
is stuck wide open killing all legit pressure.

that is how i do it.
keep in mind the PCM cant see fuel pressure on most cars.
some newer cars have this sensors. (nice)
low fuel pressure,. renders the whole EFI , useless. just junk.

Mar 12, 2014 | Suzuki Esteem Cars & Trucks

1 Answer

Does a 2003 jeep have an inertia switch?


as always check all fuses first....fuse 12,19,and 24, for sure.
which engine,? there are many and a diesel.
each engine has unique EFI and specs....

did you scan the ECU? some engines has DTCs for pump pressure.
look there. using a scan tool.(any in usa work, newer)
my wild guess , car cranks but dont start?
just a clue here.?

looked at alldata.com and there are no cut out.s.
no inertial, rollover or oil pressure fuel cuts.

the PCM controls 1 fuel pump relay that powers the pump.
we check fuel pressure cranking, to see if it meets spec.
if not , work that,
if good, pressure, then we back up and check spark
fuel is last, not first test.

and if you had a real FSM it does tell you all permisses
for it to allow pump to run.
it cuts fuel for lost spark is one.
or unflood mode.

1: fuses good?
2: all dash lamps glow key on,including the CEL?
3: got spark cranking? if not there will be no fueling by design (logic)
4: if compression is good, the engine runs with test fuel for
say 3 seconds, so you check fuel pressure cranking
and get 0 PSI (the actual pressure, is very important in this diagnosis.
0 , 10psi, 60? ( can be pump, 12v power to pump or regulator bad.)

that is the order, and if you get to #4 we work that.








Dec 29, 2013 | 2003 Jeep Grand Cherokee

1 Answer

Where is the emergency shut off in a 1995 geo prizm?


All cars, EFI. (some have 3 fuse to operate ECU/spark/ fuel) check em yet?
check power to pump 12v cranking?
no, ? 12v, or 6v? (6v or near is corroded wires /conns)
check power (12v) from fuel pump relay cranking, got 12v there.
if yes , the the path is broken to the rear ) (inertial switch?, not in 95)
if not,12v now, the FP relay is bad or ECU is not turning it on.
if 12v is across the FP relay coil the ECU is working.
if 12v is across this relay, and output is dead, that is a bad relay
or the FI use feeding it is blown.
btw #1 all cars cut fuel (INJ) when spark is detected bad. (ecu)
btw#2 some (software) cut the fuel pump for same reasons.
btw#3, most cars, only activate the FP relay for 3 seconds key on, each time. and some cars only cranking, and running.
all these facts, need to be known to make progress, in EFI.
and more.

Oct 15, 2012 | 1995 Geo Prizm

1 Answer

1999 Mercury Grand Marquis. with KOEO, voltage to fuel pump is 6.58 volts. Battery voltage is 12.47 Vdc. Removed fuel pump and installed jumper wire and fuel pump receives battery voltage. Why is voltage...


With my pump failure, I read the exact same 6.5 v at the inertia switch in my trunk with the key in the "on" position and engine not running or cranking. When cranking, the voltage to the pump jumped to +12V and if the engine did run, the voltage should stay at +12V.

The Ford manual states +12v should be at the motor for some number of seconds in the key "on" position then drop off if the engine is not cranking or does not start. In my pump failure case, I never saw 12V at the inertia switch in just the key "on" position, only +6.5V as the +12v fuel relay under the hood never engaged and/or stayed latched on.

In my situation, I measured an open circuit at the pump motor winding and suspect the +6.5V I was reading came from the Powertrain Control Module. I am also guessing if my pump winding was not open, the +6v voltage would have been +12v for a number of seconds for fuel priming as the fuel pump relay is temporarily energized, then drop to zero (relay off) if the engine does not continue to crank or run.

With my pump motor winding open, the Power Control Module may not have been loaded properly to function (reading +6.5 floating volts instead) in the key "on" position and therefore never climbed to the full +12V. There obviously was no fuel pressure at my schrader valve on the fuel rail when cranking which indicated an open wiring circuit (splice, ground or connector) or open pump winding. The 12v I was reading when cranking at least indicated the fuel pump relay was working.

With my new pump installed, I listened for the pump running in just the key "on" position. I believe I barely heard it running after the repair as it was running very quietly which indicates the +12v was there which supports my theory.

Dec 13, 2010 | 1999 Mercury Grand Marquis

2 Answers

Car will not start


you getting sparks; check the basic from fuse and relay. Its seems like you not getting any fuel by having to give it fuel, check the fuel pump see if it working, you can remove it and connect straight to 12v and do a jump. If the fuel pump is good then it will be the crank sensor, crank sensor turn on the fuel pump as long the engine continue turning over. what crank sensor does it sense the crank/flywheel turning and it send single to the computer than computer send power to the fuel pump. sensor tend to go bad over time and heat exposure; the sensor it fairly cheap to replace.

Oct 24, 2009 | 1996 Jeep Grand Cherokee

1 Answer

No start/no power to fuel pump/ power at one small wire/relay fuses ok/


most newer cars have a relay in the fuel system to shut it off when fuel pressure drops below the norm. this keeps your car from running lean and burning a piston. i whould replace the fuel pump. the fuel pump may work when you take it out but that dont mean it has enough pressure to opperate your car.

hope this helps . good luck

Oct 27, 2008 | 1999 Toyota 4Runner

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