NO.11 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [DJVA-EL]

id050312247300

11

Torque converter clutch (TCC) non-operation
DESCRIPTION
•  Torque converter clutch (TCC) does not operate when vehicle reaches torque converter clutch (TCC) operation range.
POSSIBLE CAUSE
The transaxle may not perform lock-up during fail-safe operation. Inspect for any DTCs first.
Caution
•  If the torque converter clutch (TCC) piston is burnt, inspect it. In addition, inspect the oil cooler for foreign particles which may have mixed in with the CVT (continuously variable transaxle) fluid.
A lock-up-related signal error (CVT fluid temperature sensor, APP sensor, input/turbine speed sensor, and CAN communication) can be considered possible causes.
•  Torque converter clutch (TCC) piston burnt, slippage
―  Input signal malfunction (Characteristic defective)
•  APP sensor
•  CKP sensor
•  ECT sensor
•  Input/turbine speed sensor
•  Transaxle fluid temperature (TFT) sensor
•  VSS
•  Sensor GND
―  Control solenoid malfunction (Sticking)
•  Torque converter clutch (TCC) solenoid
•  Torque converter clutch (TCC) engage solenoid
•  Body GND
―  Control valve body malfunction (Improper operation, stuck, restrict oil line)
•  Torque converter clutch (TCC) operation system
•  APP sensor malfunction (Not operating linear)
•  Input/turbine speed sensor and/or VSS malfunction (Intermittent short circuit by vibration)
Note
•  Before following the symptom troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [DJVA-EL].) (See BASIC INSPECTION [DJVA-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Retrieve the DTC for TCM using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [DJVA-EL].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [DJVA-EL].)
No
Go to the next step.
2
Does the ON signal output to the torque converter clutch (TCC) engage the solenoid when the vehicle speed exceeds 50 km/h {31 mph} or more and the accelerator opening angle is at approx. 5.0% or more after warming up the engine?
Yes
CVT internal malfunction (Electrical system is normal).
•  Control valve body oil line is clogging.
•  Torque converter clutch (TCC) piston improper operation
Replace the CVT.
(See CVT (CONTINUOUSLY VARIABLE TRANSAXLE) REMOVAL/INSTALLATION [DJVA-EL].)
No
Electrical system malfunction.
•  Go to the next step.
3
Inspect the following TCM output signal circuit:
•  Torque converter clutch (TCC) solenoid
•  Torque converter clutch (TCC) engage solenoid
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
4
Inspect the following solenoids:
(See SOLENOID VALVE INSPECTION [DJVA-EL].)
•  Torque converter clutch (TCC) solenoid
•  Torque converter clutch (TCC) engage solenoid
Is there any malfunction?
Yes
Replace the CVT.
(See CVT (CONTINUOUSLY VARIABLE TRANSAXLE) REMOVAL/INSTALLATION [DJVA-EL].)
No
Go to the next step.
5
Access the following TCM PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [DJVA-EL].)
•  TFT
•  TFTV
Are all PID values normal?
Specification
•  TFT 20 °C: TFTV 3.5 V
•  TFT 130 °C: TFTV 0.6 V
Yes
Monitor the electrical system sensor input signals other than the transaxle fluid temperature (TFT) sensor to determine if the signal is caused by a no lock-up condition.
Repair or replace the malfunctioning part according to the inspection results.
No
Inspect the transaxle fluid temperature (TFT) sensor related wiring harness.
•  If normal:
―  Replace the CVT.
•  If not:
―  Repair or replace the suspected wiring harness.
6
•  Verify the test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If the malfunction remains, inspect the related Service Information and perform repair or diagnosis.
•  If the vehicle is repaired, the symptom troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION [DJVA-EL].)