EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING [ET6A-EL (US)]
EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING [ET6A-EL (US)]
SM2566141
id0503n21021n5
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Troubleshooting item |
Excessive shift shock is felt when upshifting and downshifting |
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Description
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• 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.
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Possible cause
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1. Insufficient TCM learning
2. Signal malfunction
3. Poor installation or worn of engine mount, suspension
4. Engine control system malfunction
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic procedure
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Note
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• If a DTC is stored in the PCM, the malfunction may be resolved by repairing the malfunctioning location.
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Step |
Inspection |
Results |
Action |
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1
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VERIFY MALFUNCTION SYMPTOM
• Is the malfunction symptom (shift shock/shifting time) at the same level compared to a vehicle of the same model (ET6A-EL vehicles)?
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Yes
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Symptom troubleshooting is completed.
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No
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Go to the next step.
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2
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PERFORM INITIAL LEARNING
• Perform the initial learning. (See INITIAL LEARNING [ET6A-EL (US)].)
• Does the symptom disappear?
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Yes
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Symptom troubleshooting is completed.
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No
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Go to the next step.
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3
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PERFORM ON-BOARD DIAGNOSTIC TO VERIFY HYDRAULIC PRESSURE SWITCH OPERATION PRESSURE
• Is the operation pressure normal?
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Yes
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Go to the next step.
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No
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Replace the control valve body.
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4
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INSPECT SIGNAL PARTS FOR MALFUNCTION
• Inspect the value at the following PCM PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is there any malfunction? (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-G (US))].)
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Yes
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Repair or replace any malfunctioning parts according to the inspection result.
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No
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Go to the next step.
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5
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INSPECT ENGINE MOUNT/SUSPENSION FOR POOR TIGHTENING
• Is there any malfunction?
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Yes
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Repair or replace any malfunctioning parts according to the inspection result.
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No
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Symptom troubleshooting is completed.
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