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Old 13-01-2019
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amlav  amlav is offline
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Default How to test TD 2.5 needle sensor with an Android phone or tablet

Just trying to make it easy for members with VM 2.5 Diesel XJ's to test signal coming out from needle sensor on injector number 1 with any Android device .
In my previous post I've shown the signal on an oscillosope .
This time on an android device .
Download from Google store the Osciloscope application (it is free )
Correction : could not find it in Google Play store anymore but here is the link for the download ;

Just as a formality I have to say that I am not liable for any damage to your device but it should work just fine .

First a test lead has to be made consisting of 3.5mm jack plug (jaycar pp0138 that works with my Samsung nexus)

This plugs in to the android speaker output socket (headphone ) and the other end (shield and mid core) clips on to the needle sensor plug (unpluged from main cable loom).

Just like that ....Now fire up the engine .
Start the installed Osciloscope application and adjust the volt setting to 0.5 volt division than the timer division up or down until the signal shows up on the screen just like this :

If it shows similar to this screen your needle sensor in injector 1 is good .
Next turn off the engine (ignition key OFF) and measure with an Ohm meter the main loom plug that the sensor plugs in . It should be 7.2 Kohm
If all above ok than all is good with injector 1 and wiring to PCM .
If nothing shows up on android screen than see my post about repairing injector 1 needle sensor coil .
Follow this link :
If eratic reading on the main loom or lower/higher reading than 7.2Kohm than wiring to PCM has to be checked or connections . It could be also dislodged soldering connection on the PCM circuit board or dirty contacts .
Hope this would make it easy for anybody with a TD to diagnose a limp mode due to a faulty needle sensor .

Last edited by amlav; 14-01-2019 at 11:06 PM.
Old 13-01-2019
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ajftj  ajftj is offline
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This is cool, nice one 😀
2004 TJ, 4.0L, Manual, $2.5K spent in 2.5 years of ownership - hoping $$'s slow down soon!!
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Old 14-01-2019
croitoru  croitoru is offline
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Thank you thank you thank you.
That's great info, and so it's the rebuilding thread.
Should be sticky!!!
Old 14-01-2019
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amlav  amlav is offline
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Location: Melbourne Australia
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Added the link to the Android application download .
Here it is :

For some reason can't find it anymore on Google Play store .
PS- Installed the application on one of my old Pendo tablet and it doesn't work . The earphone socket hasn't got an external microphone input function . Sooo...maybe some Android phone tablets or phones should would work . At least the samsung nexus does .

Last edited by amlav; 15-01-2019 at 05:13 PM.
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