Does the PCM control the cooling fan?
The Powertrain Control Module (PCM) monitors coolant temperature via a coolant sensor and cycles the electric cooling fan(s) on and off as needed to fine-tune engine cooling.
How does the PCM control the engine cooling fans?
The PCM controls fan operation; it uses the signal from the ECT or engine coolant temperature sensor. This sensor senses the temperature of the engine’s coolant and sends a variable voltage signal to the PCM. The PCM operates the fan motor through the engine’s cooling fan relay.
Where is the radiator fan control module?
The Coolant Fan Control Module is located in the left front of the engine compartment next to the radiator.
What causes cooling fans not to come on?
Six things may prevent an electric cooling fan from coming on: Defective temperature switch, coolant sensor or other sensor. Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay.
What are the symptoms of a bad cooling fan relay?
1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
Can you check the operation of a fan relay?
Checking the operation of a fan relay on your vehicle is an easy procedure. Just keep in mind that many modern cars use electronic relays. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components.
Why are my cooling fans running at all times?
3. Cooling fans stay on at all times. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.
How can I tell if my PCM is faulty?
You need to check the sensors that are connected to your PCM, as well as the wires that connect them. If you’re seeing a PCM code – or two, or three – it can really help you narrow in on which sensors or wires are faulty.
1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
Why is my engine cooling fan not working?
Your engine cooling fan, only runs when needed to help cool the engine. So, a engine cooling fan, relay or control circuit failure is bad news. Because, it can allow the engine to overheat. The engine coolant sensor or a separate engine temperature switch, is used to monitor engine temperature.
How can I test if my engine cooling fan is working?
That’s why you will need to test it. Unplug the fan connector closest to the fan. Make up some jumper cables. Then connect them directly, from the battery to the fan motor, to see if it spins. Consequently, if it does not spin it is blown.
Checking the operation of a fan relay on your vehicle is an easy procedure. Just keep in mind that many modern cars use electronic relays. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components.