What is P0694 fault code? What is the explanation of the Cooling Fan 2 Relay Control Circuit high error code? How do I fix the P0694 fault code What are the causes of P0694 fault code symptoms?
What is the P0694? What is Fault Code? What does it mean?
If the powertrain control module, PCM detects a high or improper voltage signal in the control circuit for the electric cooling fan, a code P0694 will be generated. There may be two cooling fans on some vehicles. Problem is with the number 2 cooling fan.
To cool vehicles’ radiators, fans with electric motors can be used. The PCM controls the temperature of the coolant temperature sensor (ECT) to turn these engines on or off. The PCM turns the fans on when the ECT reaches a predetermined temperature. When the ECT reaches a normal temperature, the PCM switches off the fans.
The PCM turns the fans on by sending ground signals to the cooling fan relay. The voltage signal will be close to the battery voltage when it is off. The voltage signal should be close zero when the relay is turned on and grounded. The PCM will detect a voltage signal that is too high to turn the fans on and set a P0694 Code.
The P0694 fault code can be applied to vehicles of all makes and models, including but not limited to: Suzuki, Mercedes Benz. Proton, Citroen. Peugeot. Mitsubishi. Fiat. Audi.
What causes the P0694 Fault code?
Here are some reasons why P0694 should be set.
- – Defective cooling fan relay 2
- – Defective cooling fan motor 2
- – Short-circuited, damaged, melted or broken cables
- – Corroded and loose electrical connectors
- Blown cooling fan fuse 2
- – Failure of cooling fan control module (if applicable).
- – Defective engine coolant temperature sensor
- – The PCM has become faulty or requires reprogramming
What are the symptoms for P0694 Malfunction Codes?
These symptoms may be present in vehicles with code P0694.
- – Illumination for check engine lights
- – Not working cooling fan
- – Engine overheating
- – Air conditioner not working correctly
- – Lower engine performance
How to Fix the P0694 Fault Code
When dealing with problems in electrical circuits, it is important to test the battery voltage. The battery voltage should be between 12.6V and 13.8-14.5V when the engine is running.
Bloated cooling fan fuse is the most common reason for this fault code. You must locate the fuse, inspect it visually, and then remove it. The correct amperage fuse should be used to replace the fuse if it blows. If the fuse blows again after you have installed the new fuse, it is likely that there is a short circuit between the relay and the fuse. If the fuse blows again after the engine has reached operational temperature, it is likely that the cooling fan motor malfunctions. If the engine is not running and the ignition switch is off, turn the fan blades manually. The fan motor must be replaced if the blades do not rotate freely.
If the fuse works, the problem is probably the cooling fan relay. There may be one relay on some vehicles, while others have two. Look at the diagram on top of the fuse box to locate the relay and fuses. Refer to the vehicle’s repair manual if there isn’t one. A 5-pin relay is used in most applications. These pins can be identified by the numbers 85, 86 or 87, 87a, and 30. Multimeters can be used to test the reliability and stability of the relay. You can replace the relay with another relay that is the same. This is the easiest way to control it. If the problem persists, replace the relay with another one. It is important to be cautious when working around moving parts.
Note: It is important to ensure that the relay being replaced is exactly the same. A wrong relay could cause damage to the PCM. Particularly Nissan vehicles have different relays, which look similar. The socket inputs may look identical, but the characteristics of the sockets can cause problems for the PCM.
There are several repairs that can resolve the P0694 fault code.
- Replacing a defective cooling fan relay
- – Replacing an exploded fuse
- Repair of damaged, melted or corroded, short-circuited and broken cables
- Replacement of loose or rusty electrical connectors
- Repair or replacement of the cooling fan motor.
- – Replace the cooling fan control unit (if applicable).
- – Check the coolant temperature sensor for compliance, and replace it if it fails to meet manufacturer specifications.
- – Reprogramming or replacing the PCM
The fan motor can appear to be defective in rare instances, but it is actually fluid leakage from the power steering. The cooling fan motor is powered in part by hydraulic pressure from a power steering pump. This issue can impact the fan motor’s performance. The power steering pump must be replaced or repaired if there is a leak.
How serious is the P0694 fault code?
Although the P0694 code doesn’t prevent the vehicle from starting it, if the problem persists the engine could overheat and cause the air conditioner to not work properly. It is important to address this code as soon as possible due to the potential damage to the engine caused by excessive heat.
