Mechanics

ENGINE COOLANT TEMP SENSOR

2002 Toyota Celica • 4 cylinder • 118,500 miles

I just finished putting a 2005 toyota celica motor in a 2002 celica (both 1ZZE type engines). There was a sensor that was located under the center of the intake manifold that was different on the '05 (2 wires) from the '02 (1 wire), so I put the sensor from the '02 in the '05 engine. I am now getting a check engine code saying there is an engine coolant tempertaure sensor malfunction. The gauge slowly goes up about 1/2 way and then all of a sudden (less than a second) it maxes out and the check engine light comes on. The engine does not overheat. Can you tell me where the engine coolant temp. Sensor is on an '05 celica engine? Could there be some air pockets still in the engine that hit the sensor and cause the malfunction?
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Kegelmta
August 1, 2011.




Are you absolutely sure the engine is not overheating?

Wrenchtech
Aug 1, 2011.
I am not 100% sure its not overheating. No coolant is overflowing out of the reservior cap. I don't think its overheating because the gauge jumps from middle of the gauge to 100% hot in an instant (less than a second), although this morning after I drove it to work, there was some steam coming from under the hood. I opened the hood but couldn't tell where the steam was coming from. My code reader is also saying "engine coolant temperature sensor malfunction" and not "engine temperature too high". If it were overheating, wouldn't the gauge gradually creep up to the max temp? Is the temperature gauge under the intake manifold? One other thing I forgot to mention is that the 2002 engine had a different metal heater pipe that had 2 smaller outlets coming from it and one of the outlets went to the reservior (I plugged the reservior and used the metal heater tube that was on the '05 engine). I think I may have to take it apart and put the '02 heater tube on this engine, which means taking the #@$&ing intake manifold back off. The engine would probably fill much easier with the '02 hose attached because its connected to the bottom of the coolant reservior rather than the top. Any advice is appreciated.

Tiny
Kegelmta
Aug 1, 2011.
You're just assuming way too many things not in evidence here.

You could very easily have air pockets in the system.

Wrenchtech
Aug 1, 2011.
Thats what I thought too but I have topped if the coolant 5 or 6 times already including before I drove it to work this morning. I hope you are right; the last thing I want to do is more work to this car. I take it air pockets are difficult to get out of these engines? Hopefully when I drive it home, I'll be able to add a bunch more coolant. Why car designers got rid of radiator caps is a mystery to me.
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Tiny
Kegelmta
Aug 1, 2011.
On some engines they can be very difficult. For that reason we use a vacuum fill system for the coolant.

Wrenchtech
Aug 1, 2011.

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