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NO.14 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION

BHE050301026W19

14 | Torque converter clutch (TCC) non-operation
DESCRIPTION | • TCC does not operate when vehicle reaches TCC operation range.
POSSIBLE CAUSE | 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. • While performing the driving test, monitor output signal to TCC solenoid. • If output signal is sent normally to TCC solenoid and TCC does not occur, oil passage of TCC solenoid is clogged or TCC piston is operating improperly. • If output signal is not sent to TCC solenoid normally, TFT sensor governing TCC is malfunctioning. (TCC does not occur when ATF temperature is 10 °C {50 °F} or less.) • Improper adjustment of TR switch 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.)

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 | Go to No.27 "GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M RANGE", or No.30 "GEAR POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE OR P, N, R POSITIONS".
2 | Inspect the following values. (See PCM INSPECTION.) (See TCM INSPECTION.) PCM PIDs (using WDS or equivalent): • APP1 • APP2 • TP_REL • VSS TCM terminal voltage: • 2G (turbine sensor) • 2K (VSS) Are they normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts.
3 | Disconnect the TCM connector. Is the resistance between ground terminal 2M or 2Q at the TCM connector and body ground 5.0 ohms or less? | Yes | Go to the next step.
No | Repair the wiring harness.
4 | Inspect the TFT sensor. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION.) Is the TFT sensor normal? | Yes | Go to the next step.
No | Replace the TFT sensor.
5 | Inspect the TCC solenoid. Is the TCC solenoid normal? | Yes | Go to the next step.
No | Replace the TCC solenoid.
6 | Remove the torque converter. Inspect the torque converter. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION.) (See AT Workshop Manual.) Is the torque converter normal? | Yes | Overhaul the control valve body and repair or replace any malfunctioning parts. (See AT Workshop Manual.) If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts. (See AT Workshop Manual.)
No | Replace the torque converter. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION.)
7 | Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the 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.)