Thermo Time Switch Test
Posted: Jan 07, 2025 10:40 AM
Reviewing the cold start system I wanted to know how to test the TTS without having to remove the CSV. I found a video of an old MBenz owner testing the TTS to see if they are in good condition or not. The test is simple, you only need to remove it from the thermostat housing, a battery in good condition, a tester with a bulb and some cables. In the attached diagram I drew it (in Spanish) so as not to forget it, but the test is in two steps:
1) The body of the TTS is connected to the negative terminal and the W pin to the positive. The light should come on and stay on.
2) Now connect pin G to the positive terminal and the light should go out in +- 8 seconds (mine did it in approx 5 sec)
My TTS is 35° 8 sec, so the temperature (ambient) of the switch should be less than 35° Celcius (ideal to leave it in a refrigerator for a while)
I hope it is useful to you.
1) The body of the TTS is connected to the negative terminal and the W pin to the positive. The light should come on and stay on.
2) Now connect pin G to the positive terminal and the light should go out in +- 8 seconds (mine did it in approx 5 sec)
My TTS is 35° 8 sec, so the temperature (ambient) of the switch should be less than 35° Celcius (ideal to leave it in a refrigerator for a while)
I hope it is useful to you.