Kia Tech Tip: DTC P0460 Update for Sephia Models

Kia Tech Tip: DTC P0460 Update for Sephia Models

The original logic used for DTC P0460 (fuel level sensor circuit malfunction) in 2000 model year Sephias would illuminate the MIL and store a fault code for circuit-related problems (open or short), and for a fuel level input signal that failed to stay within the "plausibility" test limits stored in the ECM. "Plausibility" or "rationality" checks are frequently built into the ECM software to make sure that test results outside the normal range are detected as possible faults.

In this case, that means that the ECM monitors fuel level increases (from refueling) and fuel level ­decreases (from running the vehicle). From these, it calculates the amount of fuel that has left the tank and compares it to the amount of fuel that was delivered (injected) to the engine. When this comparison results in too large of a difference, the ECM concludes that the fuel level input signal is “implausible” and therefore DTC P0460 is set, and the MIL will come on.

However, experience has shown that these “plausibility” tests could also cause DTC P0460 to set ­because of large fluctuations in fuel level input signal from fuel being drained or siphoned from the tank, or due to stopping or parking on a steep incline, etc. ­Because these conditions were never meant to set the code, a change in the ECM software has been made to prevent unjustified “MIL on” occurrences.

Starting with vehicles produced after October 13, 1999 (VIN KNAFB1217Y5857427), the logic has been changed so that “implausible” fuel level alone will no longer cause the MIL to come on.

Of course, a malfunctioning circuit will still set the DTC and illuminate the MIL.

Because of the way the software has been changed, occurrences of “implausible” fuel level indications may still be stored in the ECM. However, unless these are accompanied by an MIL (and as long as there are no problems reported with the fuel level indication or gauge), no further action will be required.

Courtesy of Kia Technician Times.

You May Also Like

ADAS Calibration Tips

Here are 10 tips to follow during ADAS Calibration.

Millimeters Matter

When you set up a target or fixture for a camera or radar, the position and distance from the vehicle are critical to the performance and operation of the system. If the target or fixture is a few millimeters off when placed a few meters from the sensor, it can change the alignment of the sensor by meters when it is pointed down the road or the vehicle’s height is in the blind spot

Air Ride Diagnostics: Reservoirs and Compressors

The secret to diagnosing air ride problems is knowing what criteria the system uses to regulate the compressor/reservoir and having the right tool.

Mazda SkyActiv Engine Service Tips

These engines have been reliable, but there are four pattern failures you might see.

Honda Indirect TPMS Systems

Honda indirect TPMS systems do not have air pressure sensors inside the tires.

Honda Oil System Inspection

The leading cause of low oil pressure-related complaints with Honda vehicles is the oil level.

Other Posts

Mercedes-Benz ABC Suspensions

The system provides great ride & handling, but it can be complicated to service if you do not have the right training.

Now Available – March’s Digital Edition of ShopOwner

The March issue includes technical and management content and is free to download.

Chassis Diagnostic Procedures

The secret is to be quiet & listen, as the customer will tell you almost everything relevant to the repair you need to know.

ASE Education Foundation, Goodguys Continue Partnership

Goodguys is one of many industry relationships the foundation has developed to help solve the technician shortage.