12

Torque converter clutch (TCC) non-operation

DESCRIPTION

• TCC does not operate when vehicle reaches TCC operation range.

POSSIBLE CAUSE

• Basically, the TCC does not operate when the fail-safe is operating. Verify the DTC at first. If the TCC operates when driving at high speeds only, the malfunction (improper adjustment) is in the M position switch circuit or TR switch circuit.

  CAUTION:

  • If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which may have mixed in with the ATF.

• TCC slippage, burnt

• Line pressure low

• Incorrect accelerator pedal position signal

• Incorrect engine speed signal

• Incorrect engine coolant temperature signal

• Incorrect brake switch signal

• Incorrect engine torque signal

• Turbine sensor malfunction

• VSS malfunction

• Output solenoid valve system malfunction (Sticking)

• TCC control solenoid malfunction

• Control valve body system malfunction (Poor operation, sticking)

• TCC hydraulic pressure system malfunction

• APP sensor malfunction (Not operating linearly)

• Turbine sensor or VSS malfunction

• Operation of fail-safe function.

• Short to power or ground at TCC control solenoid related circuit.

STEP

INSPECTION

ACTION

1

• With the ignition switch at the ON position.

• Does the gear position indication correspond to the selector lever position?

Yes

Go to the next step.

No

Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATION ILLUMINATES IN D POSITION”, or “NO.28 GEAR POSITION INDICATION DOES NOT ILLUMINATE IN M POSITION”.

(See NO.27 GEAR POSITION INDICATION ILLUMINATES IN D POSITION [SJ6A-EL].)

(See NO.28 GEAR POSITION INDICATION DOES NOT ILLUMINATE IN M POSITION [SJ6A-EL].)

2

• Disconnect the TCM connector.

  (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)

• Measure the resistance between the TCM ground terminal 1P, 1X and the body ground.

• Is the resistance less than 5.0 ohms?

Yes

Go to the next step.

No

Repair or replace the suspected wiring harness.

3

• Access the following PCM PIDs using the M-MDS:

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• RPM

• APP

• TP_REL

• BOO

• ECT

• Are the PIDs value normal?

  (See PCM INSPECTION [SKYACTIV-G 2.0].)

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

4

• Inspect the TFT sensor.

  (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION [SJ6A-EL].)

• Is the TFT sensor normal?

Yes

Go to the next step.

No

Replace the TFT sensor.

(See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR REMOVAL/INSTALLATION [SJ6A-EL].)

5

• Inspect the TCC control solenoid.

  (See SOLENOID VALVE INSPECTION [SJ6A-EL].)

• Is the line pressure control solenoid normal?

Yes

Go to the next step.

No

Replace the control valve body.

(See CONTROL VALVE BODY REMOVAL [SJ6A-EL].)

(See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

6

• Inspect the ATF condition.

  (See AUTOMATIC TRANSMISSION FLUID (ATF) INSPECTION [SJ6A-EL].)

• Are there any metal specks found in ATF?

Yes

• If a large amount of metal specks are found, overhaul the transmission and repair or replace any malfunctioning parts.

  (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].)

  (See Automatic Transmission Workshop Manual [SJ6A-EL].)

• If a large amount of metal specks are not found, replace the control valve body.

  (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].)

  (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

No

Replace the torque converter.

(See TORQUE CONVERTER REMOVAL/INSTALLATION [SJ6A-EL].)

7

• Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.

• If the vehicle is repaired, troubleshooting completed.

• If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)