NO.10 SHIFT CONCERN: FEELS HARSH[LA4AX-EL (CD4E)]


id0503a2803800

10

Shift concern: feels harsh

POSSIBLE CAUSE
•  ATF
•  Powertrain control system malfunction
•  Joint shaft malfunction
•  Engine mount malfunction
•  Improper pressure malfunction
•  Control valve body malfunction
•  Torque converter component malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
ATF
•  Are there any problems with the following?
―  Level
Yes
Service if necessary
No
Go to the next step
2
Powertrain control system
•  Are there any malfunctions with the following?
―  Electrical input/output
―  Vehicle wiring harness
―  PCM
―  Electrical pressure control (EPC) solenoid
―  Transaxle fluid temperature (TFT) sensor
―  Turbine shaft speed (TSS) sensor
―  Throttle position (TP) sensor
―  Vehicle speedometer sensor (VSS)
―  Mass air flow (MAF) sensor
―  TCC solenoid
―  Transaxle range (TR) switch
―  3-2 timing/coasting clutch solenoid (3-2T/CCS)
Yes
Perform OBD Tests
Perform DTC troubleshooting
No
Go to the next step
3
Joint shafts
•  Do any of the following malfunctions exist?
―  Damage
―  Loose parts
Yes
Service if necessary
No
Go to the next step
4
Engine mounts
•  Do any of the following malfunctions exist?
―  Damage
―  Loose parts
Yes
Service if necessary
No
Go to the next step
5
Improper pressure
•  Is the line pressure high?
Yes
Inspect the line pressure
Service if necessary
If the pressures are normal and a specific shift position is harsh, refer to the following chart:
No
Go to the next step
6
Control valve body
•  Do any of the following malfunctions exist?
―  Bolts are not tightened to the specification
―  Gaskets are damaged
―  Main regulator valve, by‐pass valve, line modulator valve are stuck, damaged, or misassembled springs are tangled, missing, or damaged
―  Electrical pressure control (EPC) solenoid is stuck or damaged
―  Hydraulic passages are damaged
―  Separator plate is damaged or blocked
Yes
Service if necessary
No
Go to the next step
7
Torque converter component
•  TCC applied during shifts
•  Do any of the following malfunctions exist?
―  Piston is damaged
―  Pump support seal #1 (CBY) is leaking, missing or damaged
―  Case leakage
―  Converter component is damaged
Yes
Service if necessary
If heat scorched, replace the converter
No
The problem is not in the automatic transaxle
Go to the engine symptom troubleshooting
8
•  Verify the test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If the malfunction remains, inspect the related Service Information and perform repair or diagnosis.
•  If the vehicle is repaired, troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.