NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [SJ6A-EL]

id050307801700

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.

Diagnostic procedure

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.
•  Measure the resistance between the TCM ground terminal 2P, 2X 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:
―  RPM
―  APP
―  TP_REL
―  BOO
―  ECT
•  Are the PIDs value normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
4
•  Inspect the TFT sensor.
•  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.
•  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.
•  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 Workshop Manual [SJ6A-EL].)
•  If a large amount of metal specks are not found, replace the control valve body.
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 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].)