P0180 - PROBLEM IN THE COMBUSTIBLE TEMPERATURE SENSOR CIRCUIT "A"

DTC P0180 basically implies that the Powertrain Control Module has find that the voltage signal of the FTP sensor (Fuel Tank Pressure) is not within the expected level. The Fuel Tank Pressure Sensor (FTP) is a computerized device and it gives a signal to the PowerTrain Control Module (PCM) the precise amount that is in the composition of the fuel, as well as the reading of the fuel temperature gas.

All the fuel that passes through the on-line sensor is controlled, and in this way the degree of ethanol, water and other contaminants that might be present are determined. It also indicates the degree of fuel contamination. This contamination is measured taking into account the percentage of contamination in the fuel and is received by the PCM in the form of a square wave of voltage.

If the Power Train Control Module (PCM) detects an input signal from the sensor, which suggests that the fuel temperature is not within the expected level, or even that the fuel temperature is not equal to the temperature environment, the DTC code P0180 OBD2 is established.

• The Check Engine light is on.
• There may be codes related to fuel composition.

• The cables or their respective connectors of the Fuel Tank Pressure Sensor (FTP) or the Input Air Temperature Sensor (IAT) is defective and therefore cause short circuits.
• The FTP sensor (Fuel Tank Pressure) can be defective.
• Perhaps the IAT sensor (Intake Air Temperature) is showing faults.

• Check the cables and connectors that lead to the Fuel Tank Pressure Sensor (FTP). Repair or replace the components that you find in poor condition or burned as necessary.
• In general, the Fuel Tank Pressure (FTP) sensor has a reference voltage of 5 volts plus a ground, and the circuit is completed with a varying resistance. Therefore, using a voltmeter, check the voltage and ground on the sensor connector. In case the reference voltage is not present, use the voltmeter to check the corresponding circuits in the connector of the PCM (Power Train Control Module).
• If there is no reference voltage in the connector of the Powertrain Control Module (PCM), it may indicate a PCM programming error, which requires professional assistance.
• In case the reference voltage and ground are present in the connector of the FTP sensor, connect the test leads to an oscilloscope and see the active data that are in wave form, then using an infrared thermometer to measure the temperature of the fuel and compare it with the temperature reflected by the oscilloscope. If the readings do not match, the sensor may be defective, so you can change it.