What is P0693 fault code? What is the explanation of the Cooling Fan 2 Relay Control Circuit low error code? How can I fix the P0693 fault? What are the causes and symptoms of the P0693 error code?
What is the P0693? What is Fault Code? What does it mean?
If the powertrain control module, PCM detects a low voltage signal in an electric cooling fan control circuit, a code P0693 will be generated. There may be two cooling fans on some vehicles. The problem is caused by the cooling fan number 2.
Motor fans equipped with electric motors cool the radiator of vehicles. The PCM controls the temperature of the coolant temperature sensor (ECT) to turn these engines on or off. The fans are turned on by the PCM when the ECT reaches a set temperature. The fans are turned off by the PCM when the ECT reaches a temperature within the normal range.
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 not be below zero when it is grounded and switched on. If the PCM detects low voltage (10% less than the manufacturer’s parameters), the PCM sets the P0693 error code.
Vehicles susceptible to the P0693 fault code include but aren’t limited to various Saturn, Dodge and Jeep models as well as Ford, Fiat, Chrysler, Dodge, Chrysler, Fiat Chrysler, Dodge, Jeep, Chrysler and Ford models.
What causes the P0693 Fault code?
Here are some reasons why P0693 should be set.
- – Defective cooling fan relay 2
- – Defective cooling fan motor 2
- – Short-circuited, damaged, melted or broken cables
- – Corroded and/or loose electrical connectors
- – 2nd blow cooling fan fuse
- – If applicable, a defective cooling fan control module
- – Defective engine coolant temperature sensor
- – A PCM is not working properly or has to be reprogrammed
What are the Symptoms of the P0693 Fault Code
These symptoms may be present in vehicles with code P0693.
- – Illumination and control of the check engine light
- – Not working cooling fan
- – Engine overheating
- – Air conditioning not working properly
- – Lower engine performance
How do I fix the P0693 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 once more, you should replace it with the correct amperage fuse. The cooling fan motor may be defective if the fuse blows before the engine reaches operating temperature. If the engine is not running and the ignition switch is off, turn the fan blades manually. If they don’t, the fan motor needs to be replaced.
If the fuse is working, it is likely that the cooling fan relay is the problem. 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. You can refer to the vehicle manual for a diagram if you don’t have one. The majority of applications use a 5-pin relay. These pins can be identified by the numbers 85, 86 or 87a, and also 30. A multimeter can be used to verify the reliability of the relay. It is easiest to replace the relay with one that is identical. If the problem persists, replace the relay with another one. When working with components that are hot and moving, be careful.
Note: It is important to ensure that the relay being replaced is exactly the same. A wrong relay could cause damage to the PCM. The relays on Nissan vehicles are different, but they look almost identical. Although socket inputs look the same, their characteristics can be different which can cause damage to the PCM.
The following are some of the possible repairs that could resolve the P0693 fault codes:
- Relay cooling fan failure
- – Replacing a blown fuse
- – Repair of damaged or melted, corrosion, broken, and short-circuited cable
- – Repair of damaged or rusty electrical connectors
- Repair or replacement of the cooling fan motor.
- – If applicable, replacing the cooling fan control module.
- – Test the coolant temperature sensor and replace it if it is not up to manufacturer specifications
- – Reprogramming or replacing the PCM
Rarely, though the fan motor may seem to be failing, fluid leaking from power steering can cause the problem. The hydraulic pressure from the power steering pump drives the cooling fan motor. This can cause problems with the motor’s performance. If this happens, the power steering leak must be fixed or replaced.
How serious is the P0693 Fault code?
Although the P0693 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 heat damage that can cause to the engine.
