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A temp sensor information is used for all kind of things even on 1999 vehicle . The PCM/ECM -engine computer use temp info for fuel control strategy , turning on the radiator cooling fans , information for the temp gauge . The temp. sensor really doesn't control anything , it's a input to the engine computer , the engine computer controls thing's . How Engine Coolant Temperature Sensors Influence The Modern Powertrain
Sounds like a temp sensor or wiring problem.
You may only have one sensor for both the gauge and the engine computer.
If the computer temp sensor fails, or is not sending a signal to the engine computer, the fans will run as a precaution to keep the engine from overheating.
If you have replaced the correct sensor, it could be a wiring problem, or the engine coolant could be low enough to not touch the sensor.
If the coolant sensor is not sending a signal, the check engine light should also be on.
The code is telling you the engine temp sensor is telling the computer the engine is not warming up as it should. Sometimes the problem is the thermostat, or low coolant, and sometimes it is the temp sensor. Check the engine temp with an inferred thermometer first. Usually the engine temp sensor is a two wire sensor, yellow and black.
P0710 DTC Detection Condition: Either (a) or (b) is detected for 0.5 sec. or more: (1 trip detection logic) (c) Temp. sensor resistance is less than 79 W (d) After engine has been operating for 15 min. or more, resistance at temp. sensor is more than 156 kW
1. Open or short in ATF temp. sensor 2. ATF temp. sensor 3. ECM
P0711 DTC Detection Condition: Both (a) and (b) are detected: (2 trip detection logic) (a) After 12 sec. of engine start, temp. of atmosphere and that of engine coolant is more than -10°C (b) After normal driving for over 20 min. and 10 km, ATF temp. is less than 10°C
Trouble Area: 1. Open in ATF temp. sensor 2. ATF temp. sensor 3. ECM
The 2 AC fsnd turns on when the Engine temperarure hot. It receives the signal from ECU throught the Engin temperature sensor ( Coolant). Your case happens since the Engine Temp sensor went bad. At beginning the temp sensor can not produce any resistance just like open then ECU thinking engine hot turns on the Fan. When your engine ia about 85, it is a normal temp then the sensor could produce some resistance matching the look up tabel for the ECU, then the ECU turn off the Fan. Some pepople has it run all the way since the wire contact to the sensor was off. Replace the Engin Temp sensor to take care of the problem.
You have 2 temp sensors on top engine, one for your temp read out, one for the fan purpose. If you don't know which one, wait for your temp at 85 and the fan is stopping, then unplug one, imediately the fan goes on, that the one. Good luck.
since you have already tested fan and relay and both work, the problem may be the engine temp sensor. There are two sensors. One goes to instument cluster. This is engine coolant temp sensor, the other is engine temp sensor which is usually attached to engine block, sometimes they are connected to thermostat housing with the coolant sensor. You can pully the engine temp sensor and test that sensor same way as relay. (with mulitimeter)
this does not mean the sensor is defective, it most likely means the engine thermostat is stuck open and the engine is not running hot enough to satisfy the computers preset temp requirements for minimum eng operating temp.
Are you mistaking the engine temp sensor for the engine temp sending unit? The temp sensor is for the fuel injection system and the temp sending unit is for the gauge. If you asked for a sensor thats what they sold you. You need to ask for a sending unit.
The temp sensor known as the engine coolant temp. sensor tells the computer if the engine is overheating and so forth and tells the injectors how much fuel to give the engine. The temp. sending unit is what controls what your guage reads. It sounds like you need the temp. sending unit. It located near the thermostat housing with a single pole connector.