Originally Posted by BigAl.NZ
I tried with 12 applied to the power wires and nothing on sender wire then measured Ohms across neg wire and green sender wire.....nothing. (But I do hear the clicking of the relay or something inside sending out the ultrasonic signal)
This is good - see more below.
Also I have read somewhere on the BEP literature that shorting the green wire to the -ve does bad things to the TS1.
Anyhow here are my current
After lying awake most of the night thinking about the TS1, I have some more thoughts - OK, I didn’t’t stay awake all night but I did give it some more thought.
Given it’s digital nature, it won’t be easy to test bench the TS1 at home by using old analogue technology.
So how do we test the issue? I am presuming the issue is - it doesn’t work when connected the your existing VDO gauge.
We know the VDO SingleViu gauge works with the 10-180R WEMA sender but this doesn’t prove the VDO SingleViu gauge is an old style resistive analogue gauge. The VDO might be a digital style gauge with a ‘analogue lookalike’ stepper motor
pointer. It does look like a stepper drive pointer on my mate's VDO SingleViu tank gauge (using a 10-180R WEMA sender). We also know the TS1 does not work with digital gauges. So are the TS1 and the VDO gauge compatible? I don’t know for sure one way or the other. I would be asking your VDO gauge supplier for guidance here. I believe it was NAMIISS, if so I would trust their advice
Assuming they are compatible then I would proceed this way. Every thing below is predicated on the confirmation of them being compatible.
Reconnect the WEEMA sender to prove the wiring
and gauge are still OK.
Assuming they are, then something about the TSI is faulty . Is it the unit or the installation
Now for my thoughts on testing the TSI unit (not the installation) - remember this is mostly theory, I haven’t seen a TS1 up close and dirty.
The TS1 is essentially a digital ultrasonic device with programmable outputs. The easiest output to test is the 0-5V output. If you have your own programer, I would re-program it to the 0-5V and try to bench test that arrangement.
The TS1 has at least three sections. A ultrasonic transmitter (and receiver), a programmable convertor to determine the level and an output driver stage.
To test the programmable convertor and output driver stage, ensure the output is programmed to 10-180R. Reconnect it to the existing gauge, ensure the ultrasonic transmitter can not detect a valid fuel
level (eg shield it or point it to something impossible for it to read). Now leave it this way for more than 10 minutes (say 15 minutes). After 10+ mins of an invalid level, the convertor should swing the output repeatedly from 10R to 180R so the gauge should repeatedly swing from full to empty. This test does not prove the transmitter/receiver but will prove the programmable convertor and output driver.
If you can’t read the programme or re-programme the TS1 with the programmer, then the output driver is likely to be faulty.
Can you test the ultrasonic transmitter/receiver? Well, sort of; in a bush technicians way. The transmitter should pulse - probably around 20 or 30 KHz. While this is above normal hearing, sometimes you can hear sub-harmonics of the transmissions. A sort of clicking noise
. It is especially easy to hear if you place the transmitter hard against the bone immediately behind your ear. While this probably not recommended, I would try it - briefly. FWIW, the ultrasonic pingers on aviation flight recorders can be tested this way. In the case of the TS1, if you can hear the clicking, most likely the transmitter is working. If you can’t hear it, you are none the wiser.
Dunno if any of the above will help or not but ATM, I’m out of other ideas apart from getting hold of a known good TS1.