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EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING [EV6A-EL, EV6AX-EL]

EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING [EV6A-EL, EV6AX-EL]

SM2566164


id0503n9102100

Troubleshooting item

Excessive shift shock is felt when upshifting and downshifting

Description
• Excessive shift shock is felt when depressing accelerator pedal to accelerate at upshifting.
• During cruising, excessive shift shock is felt when depressing accelerator pedal at downshifting.
Possible cause
1. Insufficient TCM learning
2. Signal malfunction
― APP sensor malfunction
3. Poor installation or worn of engine mount, suspension
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
VERIFY MALFUNCTION SYMPTOM
• Is the malfunction symptom (shift shock/shifting time) at the same level compared to a vehicle of the same model (EV6A-EL, EV6AX-EL vehicles)?
Yes
Symptom troubleshooting is completed.
No
Go to the next step.
2
PERFORM INITIAL LEARNING
• Perform the initial learning. (See INITIAL LEARNING [EV6A-EL, EV6AX-EL].)
• Does the symptom disappear?
Yes
Symptom troubleshooting is completed.
No
Go to the next step.
3
PERFORM ON-BOARD DIAGNOSTIC TO VERIFY HYDRAULIC PRESSURE SWITCH OPERATION PRESSURE
• Is the operation pressure normal?
Yes
Go to the next step.
No
Replace the control valve body.
4
INSPECT SIGNAL PARTS FOR MALFUNCTION
• Inspect the value at the following PCM PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
― APP (APP 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
Go to the next step.
5
INSPECT ENGINE MOUNT/SUSPENSION FOR POOR TIGHTENING
• Is there any malfunction?
Yes
Repair or replace any malfunctioning parts according to the inspection result.
No
Symptom troubleshooting is completed.