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EXCESSIVE SHIFT SHOCK ON TORQUE CONVERTER CLUTCH (TCC) [ET6A-EL (US)]

EXCESSIVE SHIFT SHOCK ON TORQUE CONVERTER CLUTCH (TCC) [ET6A-EL (US)]

SM2566142

id0503n21022n5

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. Torque converter malfunction
4. Engine control system malfunction
System wiring diagram
• Not applicable
Connector diagram
• Not applicable



Diagnostic procedure

Note
• If a DTC is stored in the PCM, the malfunction may be resolved by repairing the malfunctioning location.

Step

Inspection

Results

Action
1
PERFORM INITIAL LEARNING AND TCC LEARNING
Perform the initial learning. (See INITIAL LEARNING [ET6A-EL (US)].)
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.
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 PID/DATA MONITOR INSPECTION.)
― APP (APP sensor)
― ENG_RPM (CKP sensor)
• Is there any malfunction? (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-G (US))].)
Yes
Repair or replace any malfunctioning parts according to the inspection result.
No
Replace the automatic transaxle.
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6A-EL (SKYACTIV-G 2.0, SKYACTIV-G 2.5) (US)].)