CSV - Yellow wire
 

Hi, Just need to confirm that a 12V is necessary on the yellow wire from starter into CSV >during starting only<?

Starter connector 50 / same as yellow ignition wire?

Hence then, if I have voltage on the yellow ignition wire but none on the yellow CSV end... replace wire, yes?

Or could this be to do with a lack of grounding on the TTS connection?

That connection goes through the temp sensor on the drivers side chainbox cover. It's possible that sensor is not working.

Thanks Scott, sensor was working before the rebuild..hence...

If I unplug the yellow wire from the CSV, attach a multimeter, and crank the motor - should the mm show 12v? Yes?

Other scenario: if the TTS/chain cover box switch is not grounded properly, should I see 12v on the yellow wire leading into the the switch or 0v - when cranking?

Yes, I think you should see 12V at the CSV connector when cranking.

If the ambient temp seen at the thermo-time switch is less than the specified cut-off temperature (45 degrees, IIRC), and the 3W heater built into the switch hasn't heated it up past that (which doesn't take long), then the CSV should have a ground connection through the TTS as well.

My understanding is that the starter solenoid has an extra circuit for the CSV (some lightweight starters don't have it, or you need to order the one with the CSV circuit specially), which feeds 12V to the CSV, when cranking, via the thermo-time switch.

The TTS provides the ground path for the CSV (I had thought it switched the 12V from getting to the CSV or not, but that wasn't correct).

The CSV injects raw fuel into the inlet manifold for a few seconds on a cold start, when cranking only. I think someone measured 7 seconds at -20 degrees or something. Guy here measured 1.7 seconds with less "brrrrr" factor. This is so you don't flood the motor.

Then you're done with the CSV until the next time you start the car and the TTS is below 45 degrees (or 25, or whatever - apparently the temp is stamped into it somewhere).

My car fired up as normal in the winter with ice on the ground/windscreen and a disconnected thermo-time switch. Just saying that I think it's designed for much more extreme conditions than I prefer to live in...