so ive been through the no starting threads and i have found one thats quite like mine, when i go to turn the car to the on postion, everything lights up except the cel, then i crank it and it cranks but does not turnover, checked my ecu, still good because i took it out and tried it on my friends and it works. I didnt hear the fuel pump go on so i checked that and its still good but doesnt sent fuel wen you turn it to the on postion, im stuck so any input would help thanks

 

how did you check the fuel pump?

 

i took mine out and replaced it wif a buddy that has one and it works fine in his car

 

Check for voltage at the pump. Fuses, relays, and fuel pump module too. There is more than just the pump itself.

 

I check it everythings good... My question is how come the cel doesnt come on when the key is position to on?

 

Bulb is probably burned out.

 

No checked and switched it it wrks fine bt still doesnt come on...

 

Hmm quite a odd problem with the CEL

 

yea ive never seen this before checked everything from relays to cps only thing i can think of is if i change the ecu would that do anything?

 

If the CEL doesn't turn on, there's a very limited set of issues that could cause that.

1. Burned out bulb. You say you've checked this.
2. Bad ECU. You say you've checked this.
3. Bad connection from ECU to cluster, this is unlikely unless someone has been messing around under the dash recently.
4. No power/ground to the ECU.

If the ECU is not getting power, it won't be able to activate the fuel pump relay, hence no fuel pump prime or operation.

Check all your fuses.

Did you do anything, have anything done, or did anything happen to the car immediately prior to this happening? Was the car jump started?

 

Nothibg has happened Prior to this jux normal driving... All fuses checked, Where r the power and grounds to the ecu?

 

So you've checked both ECCS fuses under the hood?

Power and ground at the ECU as follows - http://forums.maxima.org/all-motor/5...0-px-wide.html

 

all fuses checked and they are still good, how do i go about checking the grounds on the ecu?

 

 

ok from the ecu pin point i found that the bottom power has 12volt and the top two doesnt have any power reads 0, what does this mean?

 

Is this with the ignition switch on or off? If on, you're either not getting switched B+ to the ECU, the ECU relay isn't working, or one of the ECCS fuses is blown.

Check pin 24 with the key on, you should be reading B+ there.

Also, you haven't been messing with the diagnostic screw, have you?

 

check it wif key on and pin 24 reads 12 volts, nope i havent messed wif the screw prior to this... checked the eccs fueses and there both good.... anything else it seems like everything is in check could it be a fried wire or a connection somewhere?

 

And with the key on do you get power on the other two pins where you got nothing before?

Checked the grounds?

If the CEL doesn't light up, like I said 90% of the time the ECU has lost power or ground.

 

the two pins still have no power, the grounds, checked the ones that go on the intake mainfold, the main chasis ground from bat to car?...

 

Again, is this with the key ON? You've made no indication of that, implying that you're checking at rest, when they won't have power.

Both of those power feeds come directly from the ECCS relay. Make sure it's being triggered when the key is turned on. Make sure it's getting power. If not, it's one of the damn ECCS fuses. I believe it's labeled EGI on the relay box cover.

 

Ok egi relay was kinda corroded wif some jel like stuff... Cleaned it and cel comes on, now the fuel pump doesnt prime... What else?

 

Same as with the ECU, you need to check for power and ground all the way back. Is this Cali or Fed spec? Cali will have an FPCM, Fed won't.

You really should get just a copy of the FSM and run through the wiring.

 

It is a fed spec.. Where would the grnd and power be located? Or what am i looking for?

 

You're looking for activation of the fuel pump relay, power at the relay, power and ground at the pump. I suspect this would be more a symptom of your tinkering with the fuel pump rather than being related to the original problem.

 

Checked fuel pump voltage and it reads 4.9 ish? Is this too low? What could cause this? The relay reads 12

 

Yes, that's too low. Are you testing using a body ground as reference, or the ground wire for the fuel pump?

The relay is getting 12v in, is it putting 12v out? You are checking the relay in the left kick panel, correct?

 

Yes im using the body as a reference, yes i am using that relay... I have to check the out to see if it is 12 i only checked goin in, then does that go directly to the pump?

 

Yes, it should go directly from pin 5 on the relay to the pump. If the relay is putting out 12v, then the wire is likely chafed mostly through somewhere along the line. Should run along the driver's side of the car next to the door sills from the kick panel to the back seat.

 

i checked the wires its the black with yellow strip, aparently it is split and one goes back to my trunk so om assuming this is a cali spec it has a fpcm, but at the relay all other 3 plugs has power except ofcourse the black with yellow strip, so now im stumped what elses am i missing?

 

You're assuming it's Cali spec? You just said Fed. The presence of an FPCM confirms Cali, but you really should be certain of information you're giving when requesting help; the wrong information can throw troubleshooting down the completely wrong path quite easily.

Wait, you're showing power at 3 of 4 pins at the relay, with the key turned on? You should be seeing B+ at pins 1 and 3 (BR and B/W respectively), nothing at pin 5, B/Y (fuel pump), and a ground at pin 2, B/P (ground switched by ECU when key turned on).

If you really are seeing power at both pins 1 and 2, then the ECU isn't providing a ground to turn on the fuel pump. In that case, I'm surprised you found 4.9 'ish' volts at the fuel pump harness connector.

So again, and making sure the key is on, check to make sure the relay is putting 12v out on pin 5. You could also just hard wire the fuel pump for now to see if it runs.

A bad FPCM or drop resistor could also cause a much larger voltage drop than intended.