EXCESSIVE SHIFT SHOCK ON TORQUE CONVERTER CLUTCH (TCC) [FW6A-EL]

id050315102200

TROUBLESHOOTING ITEM

Excessive shift shock on torque converter clutch (TCC)

DESCRIPTION

•  Strong shock is felt when TCC is engaged.

POSSIBLE CAUSE

1.  Insufficient TCM learning (Insufficient TCC learning)

2.  Signal malfunction

―  APP sensor malfunction

―  CKP sensor malfunction

3.  Poor GND

4.  Torque converter malfunction

TROUBLESHOOTING ITEM	Excessive shift shock on torque converter clutch (TCC)
DESCRIPTION	• Strong shock is felt when TCC is engaged.
POSSIBLE CAUSE	1. Insufficient TCM learning (Insufficient TCC learning) 2. Signal malfunction ― APP sensor malfunction ― CKP sensor malfunction 3. Poor GND 4. Torque converter malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	PERFORM INITIAL LEARNING AND TCC LEARNING Perform the initial learning. (See INITIAL LEARNING [FW6A-EL].) Perform TCC learning using the following procedure: (1) The ATF temperature is 20 °C {68 °F} or more. (2) Constantly maintain the accelerator pedal opening angle between 20 % to 60 %. (3) Accelerate the vehicle from a stop to 1st gear and from 1st to 2nd gear. (4) Perform the shifting above (3) ten times. • Does the symptom disappear?	Yes	Symptom troubleshooting is completed.
1		No	Go to the next step.
2	INSPECT SIGNAL PARTS FOR MALFUNCTION • Inspect the value at the following PCM PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) ― APP (APP sensor) ― RPM (CKP sensor) • Is there any malfunction?	Yes	Repair or replace any malfunctioning parts according to the inspection result.
2		No	Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FW6A-EL].)