testing the injector loom - multimeter

5th June 2013, 18:52

Hi, any help with this?

5th June 2013, 20:50

YouTube?

5th June 2013, 21:17

What do you mean how do you test it? It's just wires, continuity check them! Doesn't rule out a dodgy connection though!

5th June 2013, 21:31

Just take it to a garage john

5th June 2013, 21:37

Yeah..... no to that Andy

5th June 2013, 21:44

They'll do it free, will take 2 mins

5th June 2013, 21:52

I may aswell but not paying lol.

from what i hve tried all beep from the main, the lives and all the colours.

5th June 2013, 21:54

It's too hard to explain lol

5th June 2013, 22:24

Isn't always wise to use the beep (diode check) as it'll still beep if there's some resistance. Need to make sure they have pretty much zero resistance.

5th June 2013, 22:26

Im not exactly great with one.

Any help on it?

6th June 2013, 07:50

By the looks of it, it's just 2 wires which then split into the four plugs? Check each of the lives have zero resistance between them and then the same with the earth. Also worth checking that there is no continuity between the earths and lives, rule out the possibility of a short.

6th June 2013, 09:26

Quote:

Originally Posted by Mike_Roberts

Isn't always wise to use the beep (diode check) as it'll still beep if there's some resistance. Need to make sure they have pretty much zero resistance.

The beep isnt a diode check its a continuity check...

6th June 2013, 18:13

Quote:

Originally Posted by greyjasper51

The beep isnt a diode check its a continuity check...

Yeah I know that.. but the beep function is mainly used for diodes and people who just presume "oh that's fine, it has continuity".

I said it isn't wise to use that in this instance because it will still beep even if there is resistance and will give him a false reading. You need to actually check that there is zero resistance as a high resistance wire will mean the injector is getting less than the required voltage!

You'll find that some faults aren't as easy as they first appear.. And me being an aircraft avionics technician, I sorta know a thing or two about them ;-)

6th June 2013, 18:16

Well how do i check then? what numbers am i looking for? what setting do i put it on the multimeter?

Theres 2 wires going into 4 injector plugs. 1 green and 1 colour.

The main plug has 5 pins. 1 slightly bigger pin - main live for the 4 little injector plugs and the 4 other wires are Red, Yellow, Pink and White that go to the 4 injector plugs.

Basically because i know naff all set it on beep and all wire beep.

6th June 2013, 18:50

Dear Prickle,
Please forgive for not assisting you, I blew my multimeter to bits years ago. I won,t buy another one for me to blow up again, the only part of it that still is just the continuity tester ( the beep ) bit

Mind you I am colourblind so that doesn,t help with electrics.
Vince,

6th June 2013, 19:14

Quote:

Originally Posted by Prickle

Well how do i check then? what numbers am i looking for? what setting do i put it on the multimeter?

Theres 2 wires going into 4 injector plugs. 1 green and 1 colour.

The main plug has 5 pins. 1 slightly bigger pin - main live for the 4 little injector plugs and the 4 other wires are Red, Yellow, Pink and White that go to the 4 injector plugs.

Basically because i know naff all set it on beep and all wire beep.

I'm not quite sure how it is wired exactly, whether it is switched live or switched earths. The big pin on the main pug will either be the earth or live, and the other four will be the other for each injector.

Put the multimeter on the resistance setting which will have an ohm symbol. You're looking for each wire to be as close to zero as possible, should be less than 0.01 as a bit of an estimate.

Check the big pin on the main connector has zero resistance going to one pin on each injector plug. Then check that the other four pins each have zero resistance to the remaining pin on the injector plugs.

If you like, you can then check that pretty much every other combination has no continuity, the multimeter will read OL usually. This just checks that there are no line-line faults within the loom!

6th June 2013, 19:16

Quote:

Originally Posted by citroensaxo

Dear Prickle,
Please forgive for not assisting you, I blew my multimeter to bits years ago. I won,t buy another one for me to blow up again, the only part of it that still is just the continuity tester ( the beep ) bit

Mind you I am colourblind so that doesn,t help with electrics.
Vince,

Take the meter apart and replace the fuse that has blown ;-)

6th June 2013, 19:23

Quote:

Originally Posted by Mike_Roberts

I'm not quite sure how it is wired exactly, whether it is switched live or switched earths. The big pin on the main pug will either be the earth or live, and the other four will be the other for each injector.

Put the multimeter on the resistance setting which will have an ohm symbol. You're looking for each wire to be as close to zero as possible, should be less than 0.01 as a bit of an estimate.

Check the big pin on the main connector has zero resistance going to one pin on each injector plug. Then check that the other four pins each have zero resistance to the remaining pin on the injector plugs.

If you like, you can then check that pretty much every other combination has no continuity, the multimeter will read OL usually. This just checks that there are no line-line faults within the loom!

Right ive done that to all wires and it reads 0.00

6th June 2013, 19:50

Should be grand then!

6th June 2013, 19:53

Did you check to see if they was all spraying fuel?

All it was on mine was the metal clips that hold the injectors to/in the rail were lose - fitted some others I had lying around off my 8v, re-built n It ran!