Today’s video will guide you through the troubleshooting process for a common issue with engine coolant temperature sensors. Many people feel overwhelmed by sensor troubleshooting and resort to replacing parts without diagnosing the real problem. In this tutorial, we will break down the process and make it easy for you to understand.
The problem we will address is a p0117 engine coolant temperature sensor circuit low voltage. The temperature sensor is located in the front of the driver’s side head on an LS Vortec motor. It operates on a simple principle of receiving five volts and ground, which varies in resistance based on the temperature.
Firstly, when diagnosing this issue, the ignition should be turned on, and a scanner can be used to read the data. If the scan tool shows an unrealistic temperature reading, such as 280 degrees Fahrenheit or 138 degrees Celsius, the next step is to disconnect the coolant temperature sensor and observe the reading again. If it still shows an incorrect reading, it indicates the need for sensor replacement. If the readings are within the expected range, further testing is required.
One of the additional tests involves checking the continuity and potential short to ground in the wires connected to the sensor. This step ensures that the sensor signal is reaching the PCM without interference. It’s a straightforward process that can be easily done with basic tools.
It’s important to note that if there are other codes present, they may need to be addressed before tackling the coolant temperature sensor issue. Other codes can impact the sensor readings and would require a different approach to troubleshooting.
By following these troubleshooting steps, you can avoid the common mistake of replacing parts unnecessarily and gain a better understanding of how the sensors work within the vehicle. If you have any questions or comments, feel free to post them below the video. I will continue creating diagnostic videos to help people grasp the theory behind troubleshooting and steer clear of haphazard part replacements.
What is the p0117 engine coolant temperature sensor circuit low voltage?
The p0117 code indicates a low voltage in the engine coolant temperature sensor circuit. This sensor, located in the front of the driver’s side head in the LS Vortec motor, operates with 5 volts coming in and a ground. It measures different resistance based on the temperature, which is used to calculate the temperature of the engine.
How to troubleshoot the p0117 engine coolant temperature sensor circuit?
The first step is to turn the ignition on and use a scanner to read the data. If the temperature reading is significantly off, further testing is needed. This includes disconnecting the coolant temperature sensor and observing the reading. If it indicates extreme temperatures, the sensor may need replacement. Additionally, checking the continuity and potential shorting of wires is necessary to ensure proper functioning of the sensor.
What should be done if other codes are present during the troubleshooting process?
If other codes are present, they may affect the situation and the troubleshooting process for the p0117 engine coolant temperature sensor circuit. In such cases, the specific diagnostic steps for the other codes will need to be addressed. It’s important to address all relevant codes to ensure comprehensive troubleshooting and repairs.