Kia Tech Tip: Check Engine Light Is On

Kia Tech Tip: Check Engine Light Is On

The check engine light is on and there is a mass air flow (MAF) sensor range/performance code in the system. The engine will hesitate at times. The P0101 code is more of a rationality check. The MAF sensor signal isn't rationally making sense comparing to things like throttle position and engine rpm.

Applications: 2003-’05 Rio 1.6

Customer Concern: The check engine light is on and there is a mass air flow (MAF) sensor range/performance code in the system. The engine will hesitate at times.

Tech Tips: The P0101 code is more of a rationality check. The MAF sensor signal isn’t rationally making sense comparing to things like throttle position and engine rpm.

Tests/Procedures:

1. Check freeze-frame data for engine parameters when the code sets, and get the throttle position sensor (TPS) voltage, MAF sensor voltage and engine rpm, etc. to help find a potential cause for the problem. Verify the re-flash for code P0101 has been performed; read Kia TSB under engine volume 3, #20 for a re-flash for this code.

2. Verify that there are no air leaks — even a loose oil fill cap or a pulled out dipstick can set this code.

3. Check the MAF sensor for battery voltage on the red/green wire, ground on the yellow wire and output voltage on the green/yellow wire. Look for about 0.6 to 0.8 volts at warm idle.

4. Check the TPS signal voltage on the white wire specification is 0.2 to 0.8 volts closed throttle and then a nice, smooth voltage increase as the throttle is opened.

Courtesy of Identifix

You May Also Like

How To Diagnose Electrically Controlled Thermostats

Today’s thermostats need to work just as well in tropical heat as in arctic cold. Do you understand their differences?

An electrically controlled thermostat still uses expanding wax, but it controls the temperature of the wax. To do this, it uses a heater coil surrounding the wax capsule — no fancy stepper motors or plungers.

When the heater or driver circuit fails on an electronically controlled thermostat, the thermostat becomes a conventional thermostat and will not cause the engine to overheat. However,  the engine will know it has failed and will generate a code.

GM Catalytic Converter Break-In Information

A service engine soon light may be experienced on low-mileage vehicles.

Diagnosing P0420 Or P0430 DTCs with Catalytic Converters

It’s important to understand the basics of catalytic converter chemistry and how catalytic converter failures are diagnosed.

Exhaust Repair Options

If a replacement does not meet or exceed the flow characteristics of the original, it could mean more than a loss of power.

Catalytic Converters: Efficiency Code Diagnostics

Understanding catalytic converter efficiency codes can be a long road to a happy customer or an expensive comeback.

Other Posts

Exhaust Manifold Leaks Cause Issues For The Oxygen Sensors

The engine management system does not know there is a crack in the manifold.

Catalytic Converter Theft Crisis – Due to Covid-19?

Catalytic converters have become a hot product among thieves. Has the global pandemic played a part?

Tech Tip: Close-Coupled Converter And Engine Replacement

If an engine breakdown were to occur, debris may be deposited in the converter through engine exhaust ports.

Catalytic Converters: Regulation, Replacement and Theft

Catalytic converter replacement is easy – it is the ordering and associated paperwork that can be difficult.