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NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [FN4A-EL]

BME050301030220

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 high
  • Shift solenoid A malfunction
  • Control valve body malfunction
  • Body GND malfunction
  • Pressure control solenoid malfunction

  2. Signal malfunction

  • Vehicle speed sensor malfunction
  • Sensor GND malfunction
  • TFT sensor malfunction
  • TP sensor malfunction or mis-adjustment
  • 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.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | Inspect the value at the following PCM PID using the WDS or equivalent. (See PCM INSPECTION [L3].) • TSS Is the PID values normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts.
2 | Disconnect the PCM connector. Is the resistance between the ground terminal at the PCM connector and the body ground less than 5.0 ohms? | Yes | Go to the next step.
No | Repair the open ground circuit.
3 | Inspect the resistance between shift solenoid A control circuit at the PCM connector and control valve body connector. Inspect the resistance between shift solenoid A circuit at the PCM connector and control valve body connector. Are the resistances less than 5.0 ohms? | Yes | Go to the next step.
No | Repair the shift solenoid A circuit.
4 | Inspect the shift solenoid. (See SOLENOID VALVE INSPECTION [FN4A-EL].) Is the solenoid valve operating properly? | Yes | Go to the next step.
No | Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)
5 | Inspect the LPS PID value using the WDS or equivalent. Is the LPS PID value normal? (See PCM INSPECTION [L3].) | Yes | Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)
No | Replace the PCM.