4 GEARS August 2013

A Sneak Peek into the Kia A6LF1

Expo is just around the corner, so this’d be a good time to give

everyone a sneak peek into the Kia/Hyundai six-speed A6LF1 transmission.

In the GEARS January/February issue, we discussed

-cation along with the apply charts. We also examined pre-mature failure of the under-drive brake clutch due to a worn inner lip seal, caused by a rough area inside the under-drive brake drum.

Although this transmis-sion was developed in the lat-ter part of the 2009 model year, the shops that are doing them have seen some short-term failures. The rubber cooler hoses have been known to burst, and there have also been some engine coolant contami-nation problems.

Another issue is the side or valve body cover may be-come warped and leak past the

some silicone to prevent any leaks.

Solenoid OperationThe two on/off solenoids,

shift solenoids A and B, are

by Mike Souzamembers.atra.com

THE WORD ON THE STREET

Figure 1

Figure 2

A Sneak Peek into the Kia A6LF1

6 GEARS August 2013

A Sneak Peek into the Kia A6LF1

is turned off, the solenoid is open, so pressure in the circuit is exhausted.

The diaphragm spring at the bottom of the solenoid pushes the rod toward the valve, opening the exhaust. When the solenoid is ener-gized (source voltage), the pressure in the circuit is high (71.12 PSI). The solenoid cur-rent forces the valve against the diaphragm spring to close the exhaust. Both solenoids have about 10-11 ohms resis-tance.

The line pressure sole-noid (LP) is a variable force solenoid (VFS). It’s a nor-mally High (N/H) solenoid

is turned off, the solenoid is closed, so the pressure in the circuit is high.

The valve inside the sole-noid is forced away from the solenoid by spring tension. This valve position blocks the exhaust and allows feed oil

When the solenoid is energized (50–850 mA), the pressure in the circuit var-ies (1.42–72.54 PSI).

Solenoid current will vary the posi-tion of the valve, controlling the amount of pressure in the circuit. The solenoid has about 5.1 ohms resistance.

The torque converter and 2-6 brake variable force solenoids (VFS) are nor-

When the solenoid is turned off, the solenoid is open, so the pressure in the circuit is exhausted. When the solenoid is energized (50–850 mA), the pressure in the circuit is high (1.42–72.54 PSI).

Solenoid current will vary the position of the valve, controlling the amount of pressure in the circuit. These solenoids also have about 5.1 ohms re-sistance.

overdrive solenoids are also variable

solenoids work similar to the line pres-

sure solenoid. They are normally high (N/H) solenoids. When the solenoid is turned off, the solenoid is closed, so the pressure in the circuit is high. When the solenoid is energized (50–850 mA), the pressure in the circuit is low (1.42–72.54 PSI).

Solenoid current will vary the position of the valve, controlling the amount of feed and exhaust pressure in the circuit. The solenoid has about 5.1 ohms resistance.

IMPORTANT: Always mark which location each solenoid came from.

Figure 3

Figure 4

Solenoid current will

vary the position of the valve,

controlling the amount of

pressure in the circuit.

*See our website for full warranty details

8 GEARS August 2013

A Sneak Peek into the Kia A6LF1

Although the connector color and re-sistance of the solenoids are the same, each solenoid has a different part num-ber associated with that lo-

-lenoids back in their original

Transmission Fluid Level Check

Start the engine but don’t step on the brake pedal and accelerator at

--

-

If temperature is too high, the

Shift from park to drive and drive to park; hold each position for at least

Remove the oil level plug on

Figure 5

Figure 6

Figure 7

10 GEARS August 2013

A Sneak Peek into the Kia A6LF1

5. Add ATF (SP-IV) if necessary

characteristics are different from --

-

9).

of GEARS

drive function at the ATRA EXPO in youse

Figure 8

Figure 9