Automatic Transaxle Diagnosis & Overhaul: Other Kia Optima I

RESULTS

1. Stall speed is too high in both D and R ranges Low line pressure Low & reverse brake slippage
2. Stall speed is too high in D range only Underdrive clutch slippage
3. Stall speed is too high in R range only Reverse clutch slippage
4. Stall speed too low in both D and R ranges Malfunction of torque converter Insufficient engine output

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1. Warm up the engine until the automatic transmission fluid temperature is 80-100°C.
2. Jack up the vehicle so that the wheels are free to turn.
3. Connect the special tools oil pressure gauge to each pressure discharge port.
4. 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.
5. If a value is outside the standard range, correct the problem while referring to the hydraulic pressure test diagnosis table.

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COMPONENTS

1. Apply gear oil sparingly to the speedometer driven shaft and insert the shaft.

THROTTLE POSITION SENSOR CHECK

1. Disconnect the throttle position sensor connector.
2. Measure the resistance between the throttle position sensor side connector terminal 2 and terminal 3. Standard value : 1.6-2.4 kW
3. Measure the resistance between the throttle position sensor side connector terminal 1 and terminal 3. Normal condition
4. If the resistance is outside the standard value, or if it doesn't change smoothly, replace the throttle position sensor.

OIL TEMPERATURE SENSOR CHECK

1. Remove the oil temperature sensor.
2. Measure the resistance between terminals No. 1 and No. 2 of the oil temperature sensor connector. Standard value

VEHICLE SPEED SENSOR CHECK

1. Remove the vehicle speed sensor and connect 3-10 Kohms resistance as shown in the illustration.
2. Turn the shaft of the vehicle speed sensor and check that there is voltage between terminals 2-3 (1 turn=4 pulses).

A/T CONTROL RELAY CHECK

1. Remove the A/T control relay.
2. Use jumper wires to connect A/T control relay terminal (2) to the battery (-) terminal and terminal (4) to the battery (+) terminal.
3. Check the continuity between terminal (1) and terminal (3) of the A/T control relay when the jumper wires are connected to and disconnected from the battery.
4. If there is a problem, replace the A/T control relay.

SOLENOID VALVE CHECK

1. Disconnect the solenoid valve connector

Solenoid valve resistance : 2.7-3.4ohms (at 20°C)

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1. Remove the two front console screws.
2. Remove the two rear console screws after moving front seats forward.
3. Remove two seat heater switches on the center panel.
4. Remove lever panel.
5. Remove the center panel, pulling out the center with hand after loosening two screw panel trim.
6. Remove the 12V power outlet connector pin from the center panel.
7. Remove the console after loosening four screws from the console bracket.
8. Remove the shift lock cable and the key lock cable.
9. Remove the control cable clip and pin from the shift levers.
10. Remove the shift lever mounting bolts and connector.
11. Remove the shift lever assembly.
12. Remove the clip, flange nut from the transaxle sides.
13. Remove the transaxle control cable assembly.
14. Remove the shift lock cable and the key lock cable.

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1. Apply a coating of the specified grease to the interior of the adjust bushing. Specified grease: SAE J310, NLGI No. 0
2. Move the shift lever and the transaxle range switch to the "N" position, and install the transaxle control cable.
3. When connecting the control cable to the transaxle mounting bracket, install the clip until it contacts the control cable, in the position shown in the illustration.
4. Install the shift lever assembly and connector.
5. When connecting the control cable to the shift lever mounting bracket, install the clip until it contacts the control cable.
6. Install the control cable, the key lock cable and the shift cable mounting bolt.
7. Position the console and tighten eight screws.
8. Install the center panel after connecting 12V power outlet pin, then tighten two screws.
9. Install lever panel.
10. Install two seat heater switches to the center panel.

PROCEDURE FOR CHECKING THE SHIFT LOCK

1. When the brake pedal is not depressed, the push button of the shift lever at "P" position must not be operable. (Shift lever cannot be shifted at the other positions from "P")
2. When the brake pedal stroke is 15-22 mm (with shift lever at "P" position), the push should be operable without catching and the shift lever should be shift smoothly to other positions.
3. When the brake pedal is not depressed, the shift lever should shift smoothly to "P" position from all heading other positions.
4. The brake pedal must operate smoothly without catching.
5. When the ignition key is at the "LOCK" position, although brake pedal is depressed, the push button should be operable.
6. The Ignition key must not be able to the turned to the "LOCK" position except in the "P" position.
7. If the shift lever is shifted to the "P" position, the ignition key must turn to the "LOCK" position smoothly.