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 range 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 throttle position signal
•  Incorrect accelerator pedal position signal
•  Incorrect engine speed signal
•  Incorrect engine coolant temperature 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 GND at TCC control solenoid related circuit.
Note
•  Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  With the ignition switch at the ON position.
•  Does the gear position indicator light indication correspond to the selector lever position?
Yes
Go to the next step.
No
Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE”, or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R AND N POSITION”.
(See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE [SJ6A-EL].)
(See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R AND N POSITION [SJ6A-EL].)
2
•  Disconnect the TCM connector.
•  Measure the resistance between the TCM ground terminal 1P, 1X and the body GND.
•  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
―  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
•  Remove the torque converter.
•  Inspect the torque converter.
•  Is the torque converter normal?
Yes
Inspect the ATF condition.
•  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].)