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Join Date: Apr 2003
Location: Las Cruces, NM
Posts: 2,459
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Chain housing sensors
I'm pretty sure that the left chain housing sensor is used to open the cold start valve by grounding it out (i think). If so than what does the one on the left with two connections do?
EDIT: Right chain housing temp switch to open cold start valve.
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix 
Last edited by 1fastredsc; 04-05-2004 at 02:48 PM.. |
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04-05-2004, 05:53 AM
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Or maybe someone knows which color wires go to it, because i can't find it in the wiring diagram that i have.
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix
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04-05-2004, 02:48 PM
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Join Date: May 2000
Location: Los Alamos, NM, USA
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The one on the left (drivers' side) chain case cover with two terminals is the thermal time switch; it controls the cold start valve. I believe the wires going to it are red/black and yellow; red/black to terminal "W" and yellow to terminal "G".
The one on the right (passenger's side) chain case cover is a temperature switch; it either has a blue/green or green/yellow wire connecting it. |
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04-06-2004, 04:44 AM
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Opps, ok now i am confused. If the one on left is the thermo time switch, then what is the one on the right?
See the reason why i'm confused is because the previous owner hooked the cold start valve directly to the starter instead of to the starter with the thermo time switch to keep it closed on hot start ups. Now i'm trying to correct what was done but there are a lot of cut wires that i'm fixing. When i took it apart, i remember that the right sensor was never hooked up even though the two connections on the left sensor were. That's why i assumed the right one was the thermo time switch.
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix
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04-06-2004, 11:17 AM
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OK, i made a break through. It seems that i was looking for the other chain housing temp sensor in the wrong section of the wiring diagram. It's actually part of the oxygen sensor system. But now i'm lost because it says there are two heat sensors that take a single wire and ground to the chassis. The difference of the two listed are that they appearantly switch at different temperatures. One is the temp sensor on the left chain housing, the other (i'm not sure) is the sensor on the engine breather cover. Does anyone know which is which? I believe one switches at 15C and the other is lower i think (don't have the diagram in front of me).
EDIT: I just got home from school, and i now have the diagram in front of me. One sensor is 15 degrees C with a blue/green wire and it goes directly to the oxygen control unit. The other is 35 degrees C with a green/yellow wire that goes to the acceleration enrichment device. Does anyone know which is which?
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix
Last edited by 1fastredsc; 04-08-2004 at 07:03 PM.. |
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04-08-2004, 03:46 PM
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Ok, so for information for any future pelicans curious as to which is which. The 35 degree C temp switch is the one on the breather cover with a green/yellow wire going to it. The 15 degree C switch is the one on the right chain housing going to the blue/green. Now i have to make the wires for the cold start valve that are missing.
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix
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04-24-2004, 05:50 PM
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