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Hey! Nice Rack! "Celette"
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Any CIS Gurus?
1980 Euro S M28/11
Anyone know how to test the coolant temp sensor? I also need to know how it's wired. Is ther power at the sender when you turn on the key? What does it control?
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Early Alien Sightings 914-M28/11 5.0 Hybrid (The Alien Sharkster) I think I smell your blood in the water WCC 04 done by the kids Who says Aliens only abduct people. |
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06-20-2011, 08:32 PM
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Madman
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Well... correct me if I'm wrong- but I think the CIS cars have 2 coolant temp sensors, one for the inside gauge and one to control the warm up regulator.
The temp senders are thermally activated resistors so they should have specific resistances at certain temperatures. Remove the plug to test the resistances. the gray plug sender: "measure resistance direct off temperature sensor" -10 C/14 F : 7... 12k ohms +20 C/ 68 F : 2... 3k ohms +80 C/ 250 F : 250... 400 ohms the brown plug sender (colt start valve): see the pic below from the manuals: 
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1979 Porsche 928 3sp auto, black (gone)   Yamaha FZ6R, Raven Black. (gone) 1997 VW Jetta GLX VR6 swap in. black (gone) 1988 Jeep Cherokee 4.0 lifted, mudders, roll cage, black (wife's) |
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06-20-2011, 11:39 PM
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Registered
Join Date: Feb 2008
Location: El Cajon CA
Posts: 480
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Current flows to the cold start valve whenever the starter is engaged, and if the temps drop below about 86 degrees (that's what your testing in the chart in Anthony's post), then the thermo-time switch grounds and allows the cold start valve to be energized.
If it's cold enough for the thermo-time switch to ground, then the "time" part of it will allow it to energize the cold start valve for about 10 seconds max in the coldest conditions before it de-energizes the cold start valve..
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Raymond 1979 928 5 spd |
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06-21-2011, 12:25 AM
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Registered
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Besides testing like Anthony and RJM stated, test each connector on the thermotime switch for a circuit to ground. If the heating element has burnt and fell against the body of the switch, it could cause the cold start valve to run continuously.
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Dennis |
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06-21-2011, 06:24 AM
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Hey! Nice Rack! "Celette"
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Quote:
I located a guy that offered to look at it with me. I'm very relieved.
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Early Alien Sightings 914-M28/11 5.0 Hybrid (The Alien Sharkster) I think I smell your blood in the water WCC 04 done by the kids Who says Aliens only abduct people. |
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06-21-2011, 07:23 AM
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1978 Porsche 928 4.5
