General Inertia switch no power

[larsson1971]

I have Seicento 1108 sporting T reg . car started then cut out thought i was out of petrol i was low so put £10 in and tried to start car but would not start up .

so checked to see if there was a feed to the carb nothing , then checked inertia switch and i have no live feed from it , the car was running yesterday checked all fuses that i could see , all ok . any ideas anyone

 

[arc]

it doesnt have a live feed, it deals with the negative side of things.

when u turn the ignition on, do you hear the pump prime for 2 seconds or so?

 

[larsson1971]

No nothing

 

[arc]

ok, check the 10A fuse near the ECU. If that is ok, then i would start fault finding on the fuel pump wiring.

bung a multimeter accross the fuel pump connections and get someone to turn the ignition on. the pump is under the rear seats. lift them, and there are 4 nuts holding a metal place in place - its under there. one set of wires is for the gauge, the other for the pump.

if power is getting to there, its safe to assume the pump is dead - but u may wanna try running a 12v feed to it just to make sure

 

[larsson1971]

checked 10 amp fuse ok

had the panel off at the rear seat/tank

put a test light in at the 4 wires at the fuel pump
one wire is live
another is live but dim
and the other 2 wres have nothing

anyone know the color for the pump feed

as checked the 2 wires at the inertia switch under the dash but nothing from these
as assuming there got to be fedd to control the pump

so still reckon no power so dont want to condemn thepump yet

got a power probe but need the correct wire at the pump to feed to see if the pump is working or not

fiats how true
Fix
It
Again
Tony
thanx

 

[T14086]

fiats how true
Fix
It
Again
Tony

you want help or not

 

[larsson1971]

Of course this is the best forum there is ,

 

[larsson1971]

anyone know the color for the pump feed .:worship:

 

[arc]

green and black should be live to the pump.
black and purple should be the return.

you wont get much on the green and black though, unless the engine is turning over or the ignition has just been switched on.

use a multimeter to check that there is a connection from black/purple to ground.

 

[larsson1971]

Cheers ARC will try that . let you know

 

[Maze]

hi ;
i think there is 2 big wires and 2 thin wires the 2 big are the feed of the pump and the 2 thin are the level of fuel , put the test lamp on the 2 big wires then turn the contact on the lamp must be light.

 

[rallycinq]

The pump wires go to the pump, the gauge and light wires go to the sender unit.

Cheers

D

 

[larsson1971]

car was running fine yesterday came out today tried to start and that is it .

fun and games :bang:

 

[larsson1971]

one wire is live....bright may be fuel sender
other is live but dim may be pump
other two nothing earths

had lines of at inlet (carb/singlepoint)
so when cranked over had no fuel coming out

still no feed at the inertia switch
so if this has no feed it will not feed the pump as inertia is master control for safety so reckon fault is feed to the Inertia switch

unless this only has power when vehicle is running dunno
so is this down to
ecu at fault
fuel pump relay at fault
:worship:

 

[rallycinq]

Supply to pump, then to earth via crash switch.

Does your car have an immobiliser?

Cheers

D

 

[larsson1971]

just the factory one

will double check the wires 2moro and once sure will power probe it see if pump works
let you know how i get on
as if the dim light is the pump feed may just be the pump has gave up the ghost
so new pump required

but if the pump does work

let the ganes commence:bang::bang::bang::bang:ouch

 

[arc]

there is no feed to the inertia switch, it cuts out the negative connection. poking it with a test lamp is going to show you nada. get a multimeter, they're only about £2.99 from maplin. use that to check that the test the systems properly

as i've already said, the fuel pump will have power when the ignition is inititally switched on - or if the engine is running.

try this, disconnect the two pin plug from the fuel pump. with the green/black (sometimes orange) and purple/black. connect the test lamp across them, then watch the lamp as you turn the ignition on.

 

[larsson1971]

got multimeter
will try that & report back
:worship:

 

[rallycinq]

it doesnt have a live feed, it deals with the negative side of things.

when u turn the ignition on, do you hear the pump prime for 2 seconds or so?

No nothing

Check the immobiliser is doing its thing correctly and also the fuel relay. I have rarely seen a pump fail.

Cheers

PD

 

[larsson1971]

when meter is connected and turn on ignition i get power then goes to zero

when i proceed to cranking over the engine i get a feed as well and when i let the key off the cranking posistion the feed stops which should be normal

so got power


took the pump/sender out of the tank and away from the car and used the power probe to see if pump would work

which it did

checked the wires that run the pump for continuity thats are located internally and all is fine there as as well

so put it back into the tank and tried again
nothing took the seal and plastic off the multiplug plugged it done the ignition and cranking and motor was working
at this time i had the feed and return fuel lines off but when the pump was working it never spurted out fuel
put the multiplug back together and nothing again

so got the two parts of the plug which is working the pump but still no fuel

so now i dont know if the pump is weak and cannot prime up

or something that i am missing

the saga continues:bang::bang::bang: