How to test TD 2.5 needle sensor with an Android phone or tablet

[BrokenJeep]

I've made a link to YouTube, a video of what appears to be static garbage

https://youtu.be/zB7nRxuj-p8?si=Jv9p4smCSWa8DXwC

I am getting 106.5 ohms of resistance when checking the coil via the 2 pin plug.

I gave the lead a flick and noticed a change in the graph so I can confirm it is measuring OK.

Highly appreciate your help here. I'm now trying to track down a replacement injector and attempting to repair my old one.

Cheers
Tom

[amlav]

Well...if it measures 106 Ohms but still no pulse showing it could be some mechanical issue with the needle assy. in the injector . Another sugestion would be to check the injector wirring and see if there is no mofification done to it by solderring a resistor across the 2 wires and be hiden under the plastic tube covering .
Otherwise you will probably have to get another replacement injector. Cheers

[BrokenJeep]

[BrokenJeep]

Thanks I will investigate the wiring.
Very strange as its showing perfect ohm readings however when I rest the oscilloscope closer to the injector. It appears to hear the pulses. Quite the sensitive tool.

Refer above image.
Cheers. Tom

[layback40]

Originally Posted by tom.c.coogan

Thanks I will investigate the wiring.
Very strange as its showing perfect ohm readings however when I rest the oscilloscope closer to the injector. It appears to hear the pulses. Quite the sensitive tool.

Refer above image.
Cheers. Tom

Can you use a couple of sewing needle's to make contact with the leads where they connect to the injector?
I think one of the leads maybe earthed in the electronics somewhere or in the injector coil.
First, with the lead unplugged, check that neither of the wires has a partial short to the body of the injector. If you get a resistance value & not open circuit to earth, you have a problem. If there is no such issue, you could try seeing if you have a pulse when you attach the test leads to the wires where they go into the injector body. If you get a pulse there, its a lead problem.

[BrokenJeep]

See attached.
I tried out a different head phone jack. Tested with multimeter to confirm there was a good connection.
Got a far different reading but looks like it is pulsing all over the place. Coil still checks out OK.
I've got a spare injector that's fine apart from the coil. Going by the image of latest oscilloscope reading, would you suspect there is a mechanical fault with injector? I'm thinking of putting this coil in my original injector.

[layback40]

Originally Posted by tom.c.coogan

See attached.
I tried out a different head phone jack. Tested with multimeter to confirm there was a good connection.
Got a far different reading but looks like it is pulsing all over the place. Coil still checks out OK.
I've got a spare injector that's fine apart from the coil. Going by the image of latest oscilloscope reading, would you suspect there is a mechanical fault with injector? I'm thinking of putting this coil in my original injector.

I suspect you have the vertical scale set so that you are just looking at noise.
Amlav may wish to comment as I have never used this app.