3 wiring questions

[craigztoyz]

ripped up my harness again, to make sure I have things perfect, good thing I did, 2 wires were not to my liking.

in Q harness is Gray/red (blue connector) grounding out the eccs, or does it signal it with power?

can't figure out what color for sure wire is in Z32 harness that is the 5volt one for sensor power.

The orange large wire on Z harness that is for 'fuel pump power'. Curious which way others have connected these. Thanx again, craigI have been through FSM, and the Beatch keeps freezing up on me. Been a PITA.

[Carl H]

orange wire on the z harness is presuably for the fuelpump control module.

[craigztoyz]

If I am not going to use it, and just use the relay, is that orange a powered wire, from fuse going to power the fuel system? I really think so, but want more info if I can get it

[T45]

That orange wire kicked my *** and I never did figure out where it went. Mine is not hooked up to anything and my engine runs. I'm not sure if it goes to the fpcu but i would assume that if the fpcu had no power that it wouldn't power up my fuel pump either.

[craigztoyz]

T45 ThanxThat is exactly what I needed to know. It has been a big pain to figure out what to do with it. Now I am leaving it in loom, and not hooking it up to anything. Other then than all done, checked lengths tonight, all good.

[John Dixon]

The orange wire (if you're talking about the one inside the footwell) is a positive feed off the fuel pump relay - Its on when the fuel pump is active.You may not need it on your car.There is no +5v feed, all the sensors are 12v

[RichZilla]

Nissan generally uses an earth signal for the ECCS relay. Much easier to earth the relay to turn it on than power it. I know Toyota likes to be a pain in the arse and use both negative and positive triggers for their relays. E.G. MREL (main relay control) is positive whereas FC (circuit opening relay trigger) is negative. Join it to the same ECCS trigger wire from your Z32 body harness and you'll be sweet.

[T45]

Ok maybe i did hook it up....i can't remember now. lol I need to go and check that out eventually. I just don't remember hooking it up. Yes, the thick orange wire in the pass footwell.

[craigztoyz]

The orange wire (if you're talking about the one inside the footwell) is a positive feed off the fuel pump relay - Its on when the fuel pump is active.You may not need it on your car.There is no +5v feed, all the sensors are 12v

Thanx John, Was going through the pinouts you sent me, and couldn't find anything labeld 5v, or that led me to believe it was the right one to hook up to. John, I thought that the Q did use 5v on 1 of it's sensors?

'orange is a feed off of the fuel pump relay' more great info! thank you, I am bypassing the fpcu, and just using the relay, may use that as the wire to trigger it, or just do the jump work in the rear drivers kickpanel.

[John Dixon]

What I meant is that the orange is a +ve off the output of the relay. To trigger the relay there is a coil signal that you have to set -ve Pin 7 on connector M64, that will bring the relay in.I then just took out the FPCU and connected the fuel pump earth straight to the chassis. Fuel pump then just on full when pin 7 earthed and the orange comes live so you can power anything you only want on when th engine is spinning from it.

The only Q sensor I used is the CAS and that is 12v feed, maybe the MAF is 5v but I doubt it?

[craigztoyz]

AH,That is what I figured with the orange, that it is hot from the relay, i typed like a dee d de. Thanx for info on how you rigged your's, very helpful info. I am pretty sure that the Maf needs a 5v, to it. Still tring to figure out if the Z has one or not.

[tmorgan4]

A couple of the sensors are actually 5V, MAF included. I had a separate 5V "sensor power" wire in the stock harness I spliced into the Q harness.

[RichZilla]

The 5 volt sensor supply comes from the ECU.

[Carl H]

maf is supplied a 12v feed from the eccs relay when it goes live, but the signal it produces is 0-5v.

[craigztoyz]

The 5 volt sensor supply comes from the ECU.

The wire coming from the ecu, out of the harness, 5v sensor supply, seemed to come from a supply in the q that had 5v, as the pathy appparently did too, does anyone know if the Z has one? or am I totally misguided in my path of wiring? Any input is appreciated

Rich I am curious on your input, from the ecu? I thought it went to the ecu, and then the ecu sends the power out?

[Carl H]

rule of thumb is if the ecu supplies power to the sensor it is a 5v power supply sensor but if power is routed thru the eccs relays then it is a 12v sensor.5v sensors include coolant temp and tps, maf and o2 are 12v.all solenoids are 12v.ecu triggers ground for EVERYTHING, power is run directly to sensors or supplied thru the ecu and regulated to 5v.

[craigztoyz]

rule of thumb is if the ecu supplies power to the sensor it is a 5v power supply sensor but if power is routed thru the eccs relays then it is a 12v sensor.5v sensors include coolant temp and tps, maf and o2 are 12v.all solenoids are 12v.ecu triggers ground for EVERYTHING, power is run directly to sensors or supplied thru the ecu and regulated to 5v.

Still tring to figure out which wire in Z is 5v. I think it is a thin black with red. Not hooking it up till I am sure.

[craigztoyz]

On the 94 fsm (Z32) (90 won't work, so hoping 94 is similar)page 108 of ec shows that M95 has a b/r that does not go through the relay. Does that mean that is the one I need? per post above, the one that does not go through the eccs relay, would be the voltage for the sensors? Question would be is that white feeding it from E111/M83 a 5v feed to the ign? Can't seem to find any wiring schymatics with voltage, or anything to guide me, other then the voices in my head.....

[craigztoyz]

Crap, page 124 shows something interesting.B/r from fuse block (10A????) to egr. through e12 f25. I am pretty sure it is the same wire, these fsm are like translating a strange language.