Will not auto change gears allowing to accelerate

Tiny
BIGMIKE2803$$
  • MEMBER
  • 2004 KIA SORENTO
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 255,000 MILES
I worked on my vehicle listed above myself, I replaced almost everything. However, I am having trouble with auto gear changing. It starts, runs and drives fine, but will not auto change gears allowing to accelerate. Help
Wednesday, October 28th, 2020 AT 11:22 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The throttle position sensor is a key sensor for transmission shifting. I attached the flow chart for you to follow for this.

https://www.2carpros.com/articles/automatic-transmission-problems

Line pressure is also key to the transmission to work. I attached the chart for the proper pressures.

You will need to rent a gauge for the testing.

If both of these are okay, then it has an internal failure.

Roy

Throttle Position Sensor (TPS)

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The TPS is a variable resistor type that rotates with the throttle shaft to sense the throttle valve angle. As the throttle shaft rotates, the output voltage of the TPS changes. The ECU detects the throttle valve opening based on this voltage change.

Circuit Diagram
imageOpen In New TabZoom/Print

Harness Inspection Procedures
imageOpen In New TabZoom/Print

TROUBLESHOOTING HINTS

The TPS signal is important in the control of the automatic transaxle. Shift shock and other trouble will occur if the sensor is faulty.
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Wednesday, October 28th, 2020 AT 1:27 PM

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