Coolant Sensor Issue?

[jeremylee_7]

Hi, i just replaced my thermostat on my 1g the other day, and when doing so the brittle wiring broke off of the coolant switch plug on the top of the housing (the sensor plug that has white female end, and black male end).

For the weekend while the wires were broken off it threw a CEL, which was obvious since there was no reading from the sensor.

Well i get a new plug from junk yard today and wire it up. My car is still throwing a coolant sensor CEL (code 0021) and when i run dsmlink it says my coolant temp is 306 DEGREES! But get this the dash gauge has stayed just under half way since i changed the termostat.

Could the senor itself be bad, or is it some other problem?

If anyone can check their 1g i have the black wire on the top and the green/yellow wire on the bottom of the plug, I am pretty certian it is wired in correctly but the wires broke off right at the connector so I am not 100%

 

[TrevorS]

Are you talking about the radiator cooling fan switch in the top portion of the housing, or the temperature sensor (not for the dash gauge) in the lower portion of the housing? (Does the cooling fan cycle when you leave the engine idling?)

 

[jeremylee_7]

Cooling fan does come on, the switch that had the broken wires was the top one, the switch not the sensor

Was thinking that maybee the switch wire is damaged somewhere, thus adding alot of resistance to the wire and giving a much higher reading then it should.

 

[TrevorS]

Cooling fan does come on, the switch that had the broken wires was the top one, the switch not the sensor

Was thinking that maybee the switch wire is damaged somewhere, thus adding alot of resistance to the wire and giving a much higher reading then it should.

The switch isn't used for taking readings, that's the sensor. The switch is used to control the fan.

 

[jeremylee_7]

My bad, i meant the sensor wires was damaged (like only half the wire strands were attached) and so there was extra resistance in the wire to give a faulty reading.

 

[DevilsAWD]

Hi, i just replaced my thermostat on my 1g the other day, and when doing so the brittle wiring broke off of the coolant switch plug on the top of the housing (the sensor plug that has white female end, and black male end).

For the weekend while the wires were broken off it threw a CEL, which was obvious since there was no reading from the sensor.

Well i get a new plug from junk yard today and wire it up. My car is still throwing a coolant sensor CEL (code 0021) and when i run dsmlink it says my coolant temp is 306 DEGREES! But get this the dash gauge has stayed just under half way since i changed the termostat.

Could the senor itself be bad, or is it some other problem?

If anyone can check their 1g i have the black wire on the top and the green/yellow wire on the bottom of the plug, I am pretty certian it is wired in correctly but the wires broke off right at the connector so I am not 100%

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which one you talking about... red, or green?

even though you broke the "green" connection, it only controls your fans. your coolent temp sensor "red" is probably bad. the way you explain your computer telling you the coolent is 306 degrees points towards this sensor (since your gauge is controlled by a completely different sensor.

hope this helps

-Devs

 

[jeremylee_7]

The green is the one i broke, the switch, which i got a replacement and wired.

Although since my coolant temp reading is off the chart (306 degrees) i was thinking the red, the sensor, could be having a bad wire issue as well, thus having extra resistance, and thus giving off an incorrect temp reading.

Sorry about the confusion guys, guess my mind is a little too fried from trying to diagnos this screwed up ASP code from this webpage I am taking a look at.

 

[TrevorS]

My wiring and jacketing around the thermostat housing was old and brittle and I ended up having to rewire some terminations and rewrap the harness bundle and pigtails. I had a new temp sensor in there, but before I rewired it, the engine wouldn't even fire.