Does coolant temp sensor affect AC?
As the ambient temperature sensor plays a direct role in the automated function of the AC system, when it is having a problem this may interfere with the system’s ability to cool the vehicle.
Can a coolant temperature sensor cause rough idle?
HOW THE COOLANT SENSOR AFFECTS ENGINE OPERATION. A faulty coolant sensor that always reads cold may cause the fuel control system to run rich, pollute and waste fuel. A coolant sensor that always reads hot may cause cold driveability problems such as stalling, hesitation and rough idle.
How much voltage should a coolant temp sensor have?
Engine Coolant Temperature (ECT) Sensor Voltage – Testing. The reference voltage to the sensor from the (PCM) should be about 5-volts . The return voltage signal should be around 3 to 4 volts, when the engine is cold. This should gradually drop to 2 volts or less as the engine reaches, normal operating temperature.
What happens when the coolant temp sensor goes bad?
If the coolant temperature sensor goes bad it can send a false signal to the computer and throw off the fuel and timing calculations . It is not uncommon for the coolant temperature sensor to fail and send a permanently cold signal to the computer.
What is the correct way to check a coolant temperature sensor?
If your vehicle won’t start when cold, the easiest way to check the engine coolant temperature sensor is to depress the gas pedal while cranking the engine. If it starts, that’s a pretty good sign the sensor is off.
What are the symptoms of a bad engine coolant temp sensor?
Another symptom of a problem with the coolant temperature sensor is an overheating engine. The coolant temperature sensor can also fail in a manner that causes it to send a permanently hot signal. This can cause the computer to incorrectly compensate for a lean signal, which can result in overheating, and even misfires or engine ping.