Locate the coolant temperature sensor: It's usually mounted on the engine block near the thermostat housing.
Check the sensor condition: Inspect the sensor for any signs of damage, corrosion, or leaks. If there are any issues, the sensor needs to be replaced.
Test the sensor: Disconnect the electrical connector from the sensor and check if the resistance reading of the sensor is within the specifications mentioned in the vehicle's repair manual. If the reading is off, replace the sensor.
Inspect the wiring harness: Examine the wiring connected to the sensor for damage, such as cuts or breaks. If necessary, repair the wiring or replace the entire harness.
Check the thermostat: If the coolant temperature sensor seems to be functional, the problem could be with the thermostat. A malfunctioning thermostat might cause the engine to run at lower temperatures than normal, resulting in the coolant temperature circuit low input code.
Verify coolant levels: Ensure the coolant level in the vehicle is adequate and check for leaks in the cooling system. Insufficient coolant can lead to temperature sensor issues.
Scan for other codes: Use an OBD-II scanner to scan the vehicle's computer system for additional error codes. Other detected problems may be related to the coolant temperature sensor or its circuit.
Retest the system: After the troubleshooting and any necessary repairs, reconnect the components, clear any codes, and test-drive the vehicle to verify that the issue is resolved.
Here are some additional details to keep in mind when troubleshooting this problem:
If you replace the coolant temperature sensor, use a high-quality sensor designed specifically for your vehicle model and year.
Properly bleeding the cooling system after any repairs involving coolant drainage is crucial to ensure that the system operates correctly.
Consult the vehicle's repair manual for precise steps and specifications related to testing, diagnosis, and replacement procedures for your particular model.
If the problem persists or if you're unsure about any of the steps, consider seeking assistance from a professional mechanic or technician experienced in Ford vehicles.
