Hi everyone

 

The next "non starter"

 

The car drove fine up until this morning ( daily drive ) when it wouldn´t start :o(

 

I,ve esablished that there is no fuel being pumped to the engine and that I cannot hear the fuel pump engage when turning the ignition, so I have checked the following:

 

1: All fuses

 

2: all connectors relating to the fuel pump

 

3: The fuel pump relay ( it clicks..twice? )

 

4: The fuel pump, i took it out and hooked it up to a battery and it works.

 

5: the fuel filter

 

6: After doing an electrical test I found that there is power going into the fuel pump relay but no power is being transmitted to the pump when the ignition is turned on. The relay does click twice when the ignition is turned on

 

could it be the relay, and is there anyway of testing it. ?

 

any pointers greatly appreciated.

 

Maz

CAS & PTU id check,

 

check the conenctions are clean

Can you hear it priming?

murt

 

No, I can´t hear the fuel pump priming....... and I´m getting no power coming through to the electrical connectors at the fuel pump.

murt

 

No, I can´t hear the fuel pump priming....... and I´m getting no power coming through to the electrical connectors at the fuel pump.

 

Ok seen this a few times, unplug the relay and check for live supply at one of the two closest together contacts, if ok link these two closest contacts together with a cable of suitable size. Check power at the pump plug with the ignition on, if ok now then the relay contacts are burnt out if no power you have a cable fault.

 

Jeff TT

Edited October 28, 200915 yr by JeffTT

Whack the relay whilst turning the engine over. Relay connectors/internals can be cleaned using emery cloth if that's the problem.

Jeff, if I understood you right, you are spot on mate.

 

i have power coming from one of the two closest together contacts, when I then link the two closest contacts with a cable I then get power at the fuel pump connector :o)

 

So I need a new fuel pump relay I take it ?

 

Jeff, you´re a star.

 

Maz

Jeff, if I understood you right, you are spot on mate.

 

i have power coming from one of the two closest together contacts, when I then link the two closest contacts with a cable I then get power at the fuel pump connector :o)

 

So I need a new fuel pump relay I take it ?

 

Jeff, you´re a star.

 

Maz

 

Well the relay sounds faulty, however the relay coil is energised from an output from the engine ecu, just check that is working, if you mail me your postal address will send you a relay to try before you committ.

 

Jeff

Jeff

 

That´s damn decent of you, I really appreciate the offer, but are you sure? ..I mean I´m

just a registered user and live outside of the UK ..in Germany. Could give you a BFPO Address though if you´re still okay with it.

 

Mario

Jeff

 

That´s damn decent of you, I really appreciate the offer, but are you sure? ..I mean I´m

just a registered user and live outside of the UK ..in Germany. Could give you a BFPO Address though if you´re still okay with it.

 

Mario

 

 

Yes BFO address is cool, always happy to help.

 

Now get subscribed you bad boy!! :D

 

Jeff

Jeff

 

You´re absoloutly right...I should have subscribed a while ago as you guys are brilliant and without this site I´d be lost half the time with the Z.

 

So, that said, I,ve just subscribed.

 

I´ll email you my details as soon as I have access to your email or the message facillity.

 

Really appreciate it mate

 

:)

Fuel pump relay arrived this morning ( Jeff you´re an absolute star mate ) unfortunately still not pumping fuel :(

 

the relay clicks. On one of the two closest connectors there is 12v, and on the two furthest apart connectors you get 12v out of one of them when you turn the ignition key, but only for a second or so but after than, nothing :(

 

What I do keep hearing, and I´m not sure if it related or if it´s normal but the black box on the Anti skid actuator ( 47600-30P01) clicks "oddly" when you turn the ignition key. never heard it do that before.

 

I don´t hear the fuel pump prime at all.

 

fuel pump control unit ??

 

Maz

Had a similar kinda problem many moons ago and in my case it wasn't getting the output from the ECU, another ECU cured that for me. You got another that you can try??

 

However until the ECU was swapped, which was months later, i remember a relay down in the bottom drivers side kick panel had 2 pins bridged with a wire, summit to do about it works in the same way as the wiring in your house, a ring main circuit, so goes round in a circle basically lol

hth

smithy

hiya Smithy

 

Unfortunately I don´t have another ECU handy....and I don´t know anyone local that drives a 300zx either :(

 

I guess you´re refering to the fuel pump relay and bridging the connector to get power to the fuel pump.

 

weekend is coming up so I´ll go to town on the car with a multimeter, check all wires and connections , do an ECU diagnostic and basically work on it until I can locate the problem or at least rule some things out.

 

Thanks for the tip though, always greatly apreciated.

 

Maz

Maz just going off line for a wee bit will log back in later oh and dont worry I am commited to seeing this through with you even if we need to send more parts.

 

Jeff TT

Jeff

 

I´m speechless mate...speechless with a big smile on my face, I can´t thank you enough..and if you do need to send more parts, no worries I´ll see you for any costs involved.

 

I really appreciate the help mate

 

:)

Okay ..still not getting any fuel pumped to the engine and the pump doesn´t prime when you switch the ignition on. I´ve checked the following.

 

1: Resistance on fuel pump is exactly 0.5 ohm as specified, the pump is only about 2 years old, brand new OEM pump and I took it out and tested it.

 

FUEL PUMP - OK

 

2: Fuel pump relay works and on ignition gives 12 volts to the pump for 1 second as specified in the workshop manual

 

FUEL PUMP RELAY - OK

 

3: I checked all the wiring between relay, Pump and ECU and everything is ok ECU diagnostic threw up a code 55 - No errors

 

4: I rechecked all the fuses and relevant connectors, everything appears to be ok

 

 

Does anyone know how to check the Fuel pump control module to see if it´s operating okay ?

 

Any idea which component in the car could also disable the fuel pump or effect it´s operation in any way ?

 

Just for info: car was working fine before, parked up in the garage friday afternoon..went to start her up monday morning and that´s when the problem started.

 

As alway, any pointers greatly appreciated.

 

Maz

oh..and also it´s a series 2 PTU

Hi matey, look out for another package of test bits next week will pm you a check list of what to do with them, once we have resolved this we will work somthing out with you.

 

Jeff

Jeff

 

You´re a scholar and a gentleman.

 

:)

IT STARTED !!!!

 

I bypassed the fuel pump control module and the pump started pumping fuel again. Hooked everything back up, left the module bypassed and the car even started up :)

 

Guess that means I need a new FPCM.

 

Jeff..have you got a FPCM for a TT ?

 

:)