wwwiiilll

HI this morning my c320 2002 won't start,
the engine crank and start for few second and after he stall and don't start.
no code appear and when I start the rpm rest to 0.
(I will see on forum,if the rpm rest to 0 when I start, probably the problems is the crank sensor???)
the fuel filter have one year and the plug are new.
I dont have problems with the engine before

thank s for your help

will

Glyn M Ruck

Get hold of an OBDII scanner & read codes & post.

Likely cause is CPS.
Check fuel pressure - It should be 3.8 bar.

wwwiiilll

I check with a obd11 scanner and I have no code.
what is the procedure for check the fuel pressure


thanks A +

wwwiiilll

I check the fuel pressure and no gaz came from the line when I start???

johnand

If you have no fuel pressure, check fuel pump fuse and relay, then fuel filter, then pump.

Glyn M Ruck

You have a schrader valve on the fuel rail in the engine compartment. Check pressure while cranking.

See 14

Glyn M Ruck

Sorry - I did not see Johnand reply my side. We posted at the same time.

Glyn M Ruck

Fuel filter is 130 under car at the back of the tank. Fuel pump is 110 under the back seat.

wwwiiilll

for check the pressure I unplug the hose under the hood who came from the tank,it is o.k.

Glyn M Ruck

Yes - if it is hose 60 from the filter

wwwiiilll

where is the relay and how I can chack the pump...

THANKS

Glyn M Ruck

Fuse is number 4 & relay is in the rear SAM in the trunk.

The easiest way to check the pump is to take the pressure line to the filter & place it in a jar. It should pump a litre of fuel in about 40 seconds.

wwwiiilll

CAN SOMEONE TELL ME HOW CHECK THIS RELAY WITH A OHMMETER

johnand

You should have continuity between 30 and 87 when cranking.

You can test it outside of the vehicle by applying 12V across the coil (85 and 86), and you should hear the relay click and have continuity between 30 and 87.

Glyn M Ruck

+1 Indeed

wwwiiilll

DO YOU THINK MY RELAY IS O.K.

wwwiiilll

MY RELAY IS OK

is what I have to check whether there have the power to the relay

thanks

excuse my english

johnand

Your relay coil resistance looks OK. Without knowing the relay specs, I can't say if that is the correct resistance. Coils on relays vary in resistance drastically. The relay contacts should be open when the coil is un-energized and closed when energized. You should have ~12V across 1 and 2 (The coil terminals 85 and 86), and 12V on both 3 and 4 (Relay contacts 30 and 87), while cranking.

johnand

The current at the relay coil may just be too low to measure. Do you have ~12V across 1 and 2 while cranking?

wwwiiilll

I recheck the voltage and I have 12 volts at the pompe when I start.
I unplug the hose before the fuel filter and I start,it does not have fuel from the hose...
I think the pompe is the problem...what do you think on that

johnand

Yes, I think you have found your problem and you need a new fuel pump.

wwwiiilll

I repare that and I will give some news on that.

THANKSSS

WILL

Glyn M Ruck

Sorry - One of my posts has disappeared. Your relay is fine - the only problem it could have is a bad connection across the points when latched.

Seems your pump is dead.

wwwiiilll

finally I find my problems...it s a contact in the rear SAM control.it s the relay /fuel pompe contact

samaritrey

Now thats a new one