P1186: FTS Low - Fuel Pump Temperature Sensor Low

Definition

The OBD2 code P1186 indicates that the Fuel Temperature Sensor is reading a low voltage or signal, suggesting a potential issue with the sensor or its circuit, which may affect fuel delivery and engine performance

Common causes

Faulty fuel pump temperature sensor
Wiring issues (shorts, opens, or corrosion)
Poor electrical connections
Faulty fuel pump
Engine control module (ECM) issues
Low fuel level or fuel quality problems
Overheating fuel pump due to lack of fuel flow

Common misdiagnoses

Fuel pump failure
Fuel pressure regulator issues
Wiring or connector problems
Engine control module (ECM) faults
Fuel filter blockage
Fuel injector issues
Low fuel level or fuel quality problems

Troubleshooting steps

1. Check for Additional Codes

Use an OBD-II scanner to check for any other trouble codes that may be present. This can help identify if there are related issues that need to be addressed
2. Inspect the Fuel Temperature Sensor
3. Locate the fuel temperature sensor and visually inspect it for any signs of damage, corrosion, or loose connections
4. Ensure that the wiring harness and connectors are secure and free from damage
5. Test the Fuel Temperature Sensor
6. Use a multimeter to test the resistance of the fuel temperature sensor. Compare the readings to the specifications provided in the vehicle's service manual
7. If the resistance is outside the specified range, the sensor may be faulty and should be replaced
8. Check the Fuel Pump and Circuit
9. Inspect the fuel pump for proper operation. A failing fuel pump can cause low fuel temperature readings
10. Check the fuel pump relay and fuse to ensure they are functioning correctly
11. Examine the Fuel System
12. Look for any signs of fuel leaks or blockages in the fuel lines that could affect fuel temperature
13. Ensure that the fuel is at the correct level and that the fuel quality is acceptable
14. Inspect the Engine Coolant Temperature Sensor
15. Sometimes, the engine coolant temperature sensor can affect the fuel temperature readings. Check its operation and wiring
16. Check for Ground Issues
17. Ensure that the ground connections for the fuel temperature sensor and fuel pump are clean and secure. Poor grounding can lead to erroneous readings
18. Clear the Codes and Test Drive
19. After performing the necessary repairs or replacements, clear the trouble codes using the OBD-II scanner
20. Take the vehicle for a test drive to see if the code reappears
21. Consult a Professional
22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1186 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect the Fuel Temperature Sensor

3. Locate the fuel temperature sensor and visually inspect it for any signs of damage, corrosion, or loose connections

4. Ensure that the wiring harness and connectors are secure and free from damage

5. Test the Fuel Temperature Sensor

6. Use a multimeter to test the resistance of the fuel temperature sensor. Compare the readings to the specifications provided in the vehicle's service manual

7. If the resistance is outside the specified range, the sensor may be faulty and should be replaced

8. Check the Fuel Pump and Circuit

9. Inspect the fuel pump for proper operation. A failing fuel pump can cause low fuel temperature readings

10. Check the fuel pump relay and fuse to ensure they are functioning correctly

11. Examine the Fuel System

12. Look for any signs of fuel leaks or blockages in the fuel lines that could affect fuel temperature

13. Ensure that the fuel is at the correct level and that the fuel quality is acceptable

14. Inspect the Engine Coolant Temperature Sensor

15. Sometimes, the engine coolant temperature sensor can affect the fuel temperature readings. Check its operation and wiring

16. Check for Ground Issues

17. Ensure that the ground connections for the fuel temperature sensor and fuel pump are clean and secure. Poor grounding can lead to erroneous readings

18. Clear the Codes and Test Drive

19. After performing the necessary repairs or replacements, clear the trouble codes using the OBD-II scanner

20. Take the vehicle for a test drive to see if the code reappears

21. Consult a Professional

22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1186 code