Question about 2003 Jeep Grand Cherokee

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Does a 2003 jeep have an inertia switch? - 2003 Jeep Grand Cherokee

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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.








Posted on Dec 29, 2013

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