Question about 2000 Jeep Grand Cherokee

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My 2000 jgc wont start it turns over fuel pump wont run not getting spark and will not connect to a scan tool

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Check for loose cables or broken connections on your ignition circuit

Posted on May 05, 2010

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Everything has been checked ok but my subaru forester wont start. Engine cranks but car wont start. Is it a fuel pump problem?


Lets find out
  1. pull spark plug any one hold about 1/4 inch from engine block(with insulated pliers) and have someone crank the car. You should see a spark jump across to the engine repeatedly . if so ing system is ok
  2. You don't sat the year so pull the fuel line off where it enters the carb, throttle body or injectors whichever you have. put end in a jar crank eng just a little . if fuel squirts up into the jar pump is ok. should be a lot.
  3. This will tell you which system is causing the problem
Hope this helps Mike

Mar 01, 2016 | Subaru Cars & Trucks

1 Answer

Suzuki Aerio 2004, will crank over floods out tho. Changed Plugs and Boots. New baterry too. Can smell gas @ Tail pipe. Wants to fire-but just won't catch. Where do I start looking for the answers.?


what engine? 2.3 or 2.5L?
all cylinders flooding??? spark tips on ALL dripping in gas?
check spark at all spark plugs ( ALL not just ONE)
if spark is good.
this engine is chain cam, so it makes huge noise before death.
did it?, nah
ok, so connect any $9 scan tool, and scan it. (barrow /rent.?)

you crank it for 5 seconds, not less.
and as you crank the scan tool RPM shows 250 to300 rpm and fails to start, the RPM on the tool shows you that the crank sensor is working
now release the key and do not turn off
look for DTC errors. got P0340,355? or any other DTC
that decodes to bad CMP or CKP/
yes, BINGO, the scan tool told you why spark is dead, or way off
timing,

the PCM will report Cmp or CKP errors even 1 in 6 pulses.
the PCM runs monitors against these 2 full time. and will see it fail.
and report, it, let it tell why spark is bad.
say spark is good. and still floods.
1: engine compresssion over 150psi? W.O.T?
2: flooding , i pull the fuel pump relay and crank now.
starts and runs for 3 -5 seconds, yes, that is the flood clearing
so i then try test fuel, runs perfect now (no fuel pump) ???
runs for 3 second, each test fuel usage. well good motor, good spark.
what more do you want? sure to run
so you have either insane high fuel pressure. or injectors leaking
can and does happen.
the tests are all in the FSM under injector and pump testing.
i check fuel pressure first. as its a mandatory thing.....
to factory spec. for unsaid engine.
then i do a injector leak down and balance check.
ask if you get this far.....????


Jan 24, 2014 | 2004 Suzuki Aerio

1 Answer

I have a connector comming from the fuse relay center in the bunch of whires that is not connected and is a red wire which i know is a hot wire what do i do? connector is small and black comming out o


confusing, 1990 , CADDY a TOYOTA Escalade?
CHECK ALL FUSES in BOTH FUSE BOXES. first.

all cars have huge options, and one harness.
so vast numbers of connectors are just there. ignore them.
seems... seems in science is no good, we work in absolutes.
or better valid ranges. (as a pilot says, "in the envelope")
ill try to answer both cars, the relic toy and 2000 CAD


we fix cars by diagnosis.
the first is to tell the helper what is wrong.
it dont start. (right?
and you check both fuse boxes, for blown fuses, right?
do you have spark? y/n? on all spark plugs.? y/n
if you have spark does spray in test fuel start engine
even for 3 seconds>? a key test.
yes, then you have low fuel pressure.
no, bad engine. (or you lied about spark , lol)

now fuel pressure.
the ECU can cut fuel and pump if it sees spark go bad
this prevents crash and burn,.like as seen on TV.
connect a scan tool is there DTC 340,355 being thrown cranking 5 seconds. yes, bad crank/cam sensors. or RPM is 0 cranking
bad ckp. senor.

so, rule 2, the ECU, many not, (READ FSM) run pump
until it is cranking
so you check for 12vdc at the pump cranking,
ok i got 12v
i then check fuel pressure with a real gauge.
it see 0psi, bad pump. see 10 psi bad pump or stuck open fuel
40PSI normal there is a range, but ask.
pressure reg. see 65PSI, fuel pressure reg stuck closes or return line blocked.
no guessing ,simple tests tools $80 total.

so does test fuel run engine> do that.
ever do a tune up?
ever check spark plug tips for wet or dry , after a failed crankup?
dry, no fuel. add some.
wet ,flooding.. crank using super secret WOT.


ok a direct quote from the FSM TOY.
  1. Using a jumper wire, short terminals FP and +B of the check connector.<< this is the diagnostic port.
  2. Turn the ignition switch ON, but do NOT start the car.
  3. The fuel pressure should read 38-44 psi (265-304 kPa).
  4. If the pressure is too high, the pressure regulator is probably defective. If it is too low, check for the following:
    1. Fuel hoses and connections for leaks or restrictions.
    2. Defective fuel pump.
    3. Clogged fuel filter.
    4. Defective pressure regulator.
now the direct quote for CAD FSM.
what engine,there are many?
rule 1 , 2000
ever scan the ECU/PCM for error cranking or must we do this the hardway.
hard:
key off
pressure gauge on rule rail
not started engine.
60-66 psi is normal. (books shows scan too activate)

the FSM shows the leak down test too, at this port.
it also says using CAD scan tool command on the fuel pump.
says tool only allows 2 seconds run time,
but you can check it cranking or cranking then key
off see how fast 60psi drops.
there are many pump tests. and the leak down rate
and injector leak down test.
all this requires a fuel pressure gauge
and reading the tests on alldata.com or buy the full FSM from CAD.

Im sure the CAD only has pump power (12v) cranking and running
and running it drops about 10psi and rises at high altitude.
they wouldn't need

PUMP operation rules are complex.
this is all hard coded in the PCM brain this logic.
most cars are,
if sparks good, and not W.O.T cranking and cmp and CKP are
happen run pump and inject.
if not , cut fuel.
some cars cut the pump after 2 seconds running, its hard coded logic. if spark is bad.
many mech dont know this. but the only variace ive ever seen is
some cars do make fuel pressure. just key on, for 3 seconds.
mostly older cars.
my guess you posted in the Toyota section?

Dec 29, 2013 | 1990 Toyota Corolla

2 Answers

Why won't my car start? It was running last night.


Try start the car again when it is completely dry, if it starts the rain may be short circuiting something on the loom in the engine bay.

If it still wont start,

will it turn over? (car tries to start)
- If it wont turn over the battery would be dead

- If it turns over but wont burst into life then we can go from there ^_^

Oct 24, 2012 | 2002 Buick Rendezvous

1 Answer

Engine turns over but wont start


engine turn over wont start, to pin point problem need to check for spark at spark plugs and check listen see if you can hear fuel pump running with the ignition switch on position for 3 seconds.i would code scan vechicle before buying new parts.could have faulty camshaft position sensor or faulty crankshaft position sensor.

Oct 22, 2012 | 2000 Volkswagen Golf

2 Answers

2000 DODGE STRATUS TURNS OVER BUT WON'T START


Did he physically check the timing? IE pulled the timing cover off? You need a good scan tool. See if it shows cam and crank sensors, and if they are in sync. If you are infact getting fuel and spark, it should run, but you are not getting one or the other.

May 30, 2009 | 2000 Dodge Stratus

1 Answer

Getting fuel wont start


If you can, have the computer scanned for active codes. Always check for fuel and spark. with fuel injection it isnt enough to know that the pump is running you need over 35 psi, line pressure. Let us know.

May 09, 2009 | Ford Explorer Cars & Trucks

1 Answer

2000 Jeep Cherokee Sport cranks but will not start.


Pop off a spark plug wire, insert a screwdriver into the wire (hold onto the handle), hold a 1/4 inch to 1/2 inch away from engine and crank the engine. There should be a spark. If no spark you have a problem with either the ignition system or the ignition system control circuits. Generally if the computer dosen't see a crank signal you will not get a spark (if it doen't see a cam signal you won't get fuel). If no spark from wire try it on each wire. If not a single wire has spark, rent a scan tool from autozone or napa and see if there are any stored codes, also see if any codes come up while cranking. If you can't rent one you can buy a cheap one for under 30-40 dollars. If no codes and no spark the only thing you will have left to try is replacing the coil pack/s. If after replacing the coil packs you still don't have spark you will have to take it into a shop to have it checked out. The reason you would need to take it into a shop is because they will need to plug in a very expensive scan tool(1000-5000 dollars) that will show them all the sensor inputs. Hope this gets you up and running.

Apr 01, 2009 | 2000 Jeep Cherokee

1 Answer

NO POWER OR GROUND TO IGNITION COIL


usually when coil dies the computer shuts off fuel pump to stop you catalytic converter and engine filling up with gas! do you have a eng light on if so scan with:OBD 2 scan to retreve you problem don't get$$ any how do you have SPARK when coil is connected?have you tested with a spark tester tool not spark plug not efficient!!! also have you tested all the in car fuses and under hood fuses with circuit tester tool not pulling and looking!???good place to start!

Jan 10, 2009 | 1997 Dodge Intrepid

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