An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 20 times.
An expert who has written 20 answers of more than 400 characters.
Re: checking computer says engine coolant temp too low
The stat is in the upper rad hose follow the upper hose to the mtr the hose goes to the themostat housing there are two bolts holding it on look to the left of the housing you will see a sensor that is screwed into the intake manifold when you remove that sensor coolant will run out
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
No , their arn't two coolant temp. sensors . One near the thermostat housing . The Temp sensor is a input to the PCM / ECM . The PCM / ECM needs the temp info for fuel calculations . The temp gauge on the instrument cluster gets this info over class 2 serial data network Hooking up a factory or professional scan tool that can read sensor data is the easy way to diagnose ,not guessing . Looking at factory service info. an wiring diagrams too see what is what is another way . You have no clue ,take it to a qualified repair shop.
The engine coolant temperature sensor is a thermistor (a resistor which changes value based on temperature) mounted in the engine coolant stream. Low coolant temperature produces a high resistance (100,000 ohms at -40°C/-40°F) while high temperature causes low resistance (70 ohms at 130°C/266°F).
The PCM supplies a 5 volt signal to the engine coolant temperature sensor through a resistor in the PCM and measures the voltage. The voltage will be high when the engine is cold, and low when the engine is hot. By measuring the voltage, the PCM calculates the engine coolant temperature. Engine coolant temperature affects most systems the PCM controls.
The scan tool displays engine coolant temperature in degrees. After engine startup, the temperature should rise steadily to about 90°C (194°F) then stabilize when thermostat opens. If the engine has not been run for several hours (overnight), the engine coolant temperature and intake air temperature displays should be close to each other. A hard fault in the engine coolant sensor circuit should set DTC P0117 or DTC P0118; an intermittent fault should set a DTC P1114 or P1115. The DTC Diagnostic Aids also contains a chart to check for sensor resistance values relative to temperature.
The ECT sensor also contains another circuit which is used to operate the engine coolant temperature gauge located in the instrument panel.
... A faulty coolant sensor that always reads cold may cause the fuel control system to run rich, it may be sending the wrong info to the computer and the guage. make sure there is no air in the coolant system, and it is full. see if coolant resorvoir is full when hot. if all is ok, change coolant sensor. good-day!
The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.
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.
The first step is to determine whether the engine is actually running cold or if the engine computer just "thinks" it is. Your temperature gauge is controlled by the engine computer. I use an infrared thermometer directed at the base of the Engine Coolant Temp (ECT) sensor while watching the ECT sensor data on the computer to see if they match. This should be done before replacing ANY parts. You need to make sure that the ECT is not "lying" to your engine computer. Your vehicle is also equipped with a Cylinder Head Temperature (CHT) sensor to measure the the temperature at the cylinder head. (The ECT is located in the intake manifold.) These should read within 5 or 6 degrees from each other at all times. If it is determined that the sensors are all functioning properly, and the engine actually is running cold, then I would recommend getting a thermostat from the dealer. (I have had a few problems with aftermarket thermostats.)
What your describing is either a sticking thermostat, a low coolant condition or a blown cylinder head gasket.The code is for coolant temp fault.Not always the temp sensor but it is located next to the thermostat housing.
The fans are turned on by the PCM, if the PCM is not telling the fans to turn on, they won't even if everything tests fine.
2005 Chrysler 300 V8-5.7L VIN H
Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMP SENSOR REMOVAL The Engine Coolant Temperature (ECT) sensor (3) on the 5.7L engine is located under the air conditioning compressor. It is installed into a water jacket at the front of the cylinder block. WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. COOLING SYSTEM MUST BE PARTIALLY DRAINED BEFORE REMOVING THE COOLANT TEMPERATURE SENSOR. 1. Partially drain the cooling system. 2. Remove accessory drive belt. 3. Carefully unbolt air conditioning compressor from front of engine. Do not disconnect any A/C hoses from compressor. Temporarily support compressor to gain access to ECT sensor (3). 4. Disconnect electrical connector (2) from sensor (3). 5. Remove sensor (3) from cylinder block. INSTALLATION 1. Apply thread sealant to sensor threads. 2. Install ECT sensor (3) to engine. 3. Tighten sensor to 11 Nm (97.3 inch lbs.) torque. 4. Connect electrical connector (2) to ECT sensor (3). 5. Fill the cooling system.
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.