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
- Condition
(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [LA4AX-EL (CD4E)].)
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
- Splines damaged
(See AUTOMATIC TRANSAXLE REMOVAL [LA4AX-EL (CD4E)].)
(See AUTOMATIC TRANSAXLE INSTALLATION [LA4AX-EL (CD4E)].)
Yes
Service if necessary
No
Go to the next step
4
Engine mounts
• Do any of the following malfunctions exist?
- Damage
- Loose parts
- Missing
(See AUTOMATIC TRANSAXLE REMOVAL [LA4AX-EL (CD4E)].)
(See AUTOMATIC TRANSAXLE INSTALLATION [LA4AX-EL (CD4E)].)
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 Bulletins and/or On-line Repair 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.