SureTrack Real Fix: Erratic Fuel Temperature

Real Fixes from the SureTrackĀ® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-onĀ® diagnostic software version.

Diagnosing this Seat is easy using a scan tool. The Scanner and lab scope were used to electronically prove the failure indicated by the trouble code and determine if it was the sensor or the wiring. Another fix successfully completed.

2012 Seat Altea 2.0 Diesel

000387, Replaced Fuel Temperature Sensor

The customer states the check engine light is on.

Connected a scan tool and found code 000387 – Fuel Temperature Sensor A (G81): Open or Short to Plus. Performed a road test, used the scan tool to monitor live data and found the fuel temperature sensor signal parameter was erratic. With the key on, engine off, used a multi-meter to check for the presence of voltage and ground at the fuel temperature sensor, and found both were present. At idle, backprobed the fuel temperature sensor and monitored the sensor signal on a lab scope. The fuel temperature sensor signal observed on the lab scope was erratic. Used the multi-meter to measure the resistance of the fuel temperature sensor and found the measured resistance was out of specifications. The results of these tests verified the fuel temperature sensor was faulty.

Replaced the fuel temperature sensor, cleared codes, performed a road test and verified the vehicle operated properly.

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About the Author

Nick Taylor

Nick Taylor is the SureTrack Community Administrator and a Senior Applications Specialist at Mitchell 1 with over 25 years of experience with electronic repair data systems. Nick previously worked in the automotive dismantling and engine rebuilding industries.