Kia Rio: Automatic Transaxle System / Automatic Transaxle System

Kia Rio 2017-2023 YB Service Manual / Automatic Transaxle System / Automatic Transaxle System

Repair procedures
Repair procedures

Torque Converter Stall Test

This test measures the maximum engine speed when the select lever is at the "D" or "R" position and the torque converter stalls to test the operation of the torque converter, starter motor and one-way clutch operation and the holding performance of the clutches and brakes in the transmission.


Do not let anybody stand in front of or behind the vehicle while this test is being carried out.


Check the automatic transmission fluid level and temperature and the engine coolant temperature.

Fluid level : At the HOT mark on the oil level gauge

Fluid temperature : 80 - 100°C (176 - 212°F)

Engine coolant temperature : 80 - 100°C (176 - 212°F)


Check both rear wheels (left and right).


Pull the parking brake lever on, with the brake pedal fully depressed.


Start the engine.


Move the select lever to the "D" position, fully depress the accelerator pedal and take a reading of the maximum engine speed at this time.


The throttle should not be left fully open for any more than 5 seconds.

If carrying out the stall test two or more times, move the select lever to the "N" position and run the engine at 1,000 r/min to let the automatic transaxle fluid cool down before carrying out subsequent tests.

Move the select lever to the "R" position and carry out the same test again.

Stall rpm : 2,000 - 2,700 RPM

Passable cause
R range slip
REV in D range normal
L/R in D range abnormal
D1 range slip
D range 1st/ Sports mode 1st
L/R in reverse range abnormal
UD in reverse range normal
D3 range slip
3rd gear hold
OD in 3rd gear slip
(1st and 2nd gear normal)
Forwarding, reverse slip
D range, R range
Torque converter
Oil pump, Manual valve in the valve
Driving device abnormal

Hydraulic Pressure Test


Warm up the engine until the automatic transaxle fluid temperature is 80 - 100°C(176 - 212°F).


Jack up the vehicle so that the wheels are free to turn.


Connect the special tools(09452-21500, 09452-21000, 09452-21600) oil pressure gauge to each pressure discharge port.


Measure the hydraulic pressure at each port under the conditions given in the standard hydraulic pressure table, and check that the measured values are within the standard value ranges.


If a value is outside the standard range, correct the problem while referring to the hydraulic pressure test diagnosis table.

1. RED pressure port
2. OD pressure port
3. 2ND pressure port
4. REV pressure port
5. DA pressure port
6. UD pressure port
7. LR pressure port
8. DR pressure port

Standard Hydraulic Pressure Table

[Measure condition]

Rotational seed of oil pump : 2500rpm

Position of manual valve : "D"

Condition of solenoid valve : 3rd

LP Sol Dury Rate : 0 %

PCSV-A Duty Rate : 0 %

PCSV-B Duty Rate : 100 %

PCSV-C Duty Rate : 0 %

ON/OFF Sol Duty Rate : OFF

PCSV-D Duty Rate (%)
DA Pressure [kgf/cm²]
DR Pressure [kgf/cm²]
3.4 ± 0.8
5.2 ± 0.8
2.3 ± 0.5
Max. 0.2
9.0 ± 0.8
Max. 0.2

* Satisfy above condition at both ascending part of PCSV-D Sol (0 → 100%) and descending part (100 → 0%).

* Duty rate of PCSV-D Sol having 0.2 kgf/cm² of DA pressure must pass through the range of 20 - 30%.

* Minimum value should be below 0.2 kgf/cm².

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