NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [FS5A-EL]

id050308802100

16

Judder upon torque converter clutch (TCC) operation
DESCRIPTION
•  Vehicle jolts when TCC is engaged.
POSSIBLE CAUSE
•  Poor TCC engagement due to either slippage because the TCC is stuck or the line pressure is low.
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.
1.  Torque converter clutch piston slippage, burnt
•  Line pressure low
•  Shift solenoid A malfunction
•  Shift solenoid E malfunction
•  Control valve body malfunction
•  Body GND malfunction
•  Pressure control solenoid A malfunction
2.  Signal malfunction
•  VSS malfunction
•  Sensor GND malfunction
•  TFT sensor malfunction
•  APP sensor malfunction
•  CKP sensor malfunction
•  Input/turbine speed sensor malfunction
3.  Torque converter malfunction
Note
•  Before following the 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 [FS5A-EL].) (See BASIC INSPECTION [FS5A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  TSS
Is the PID value normal?
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts according to the inspection result.
2
Disconnect the TCM connector.
Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit.
Reconnect the TCM connector.
3
Inspect the resistance between shift solenoid A and E control circuit at the TCM connector and control valve body connector.
Inspect the resistance between shift solenoid A/E circuit at the TCM connector and control valve body connector.
Are the resistances less than 5.0 ohms?
Yes
Go to the next step.
No
Repair or replace the shift solenoid A and/or E circuit.
4
Inspect the shift solenoid A and E.
(See SOLENOID VALVE INSPECTION (PRIMARY CONTROL VALVE BODY) [FS5A-EL].)
Are the shift solenoids operating properly?
Yes
Go to the next step.
No
Overhaul the control valve body and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
5
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  LPS
Is the PID value normal?
Yes
Overhaul the control valve body and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
No
Replace the TCM.
(See TCM REMOVAL/INSTALLATION [FS5A-EL].)
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, troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.