NO.20 SHIFT CONCERN: SOFT/SLIPPING 3–2 SHIFT (AUTOMATIC)[LA4AX-EL (CD4E)]


id0503a2805000

20

Shift concern: soft/slipping 3–2 shift (automatic)

POSSIBLE CAUSE
•  Powertrain control system malfunction
•  Control valve body malfunction
•  Oil pump malfunction
•  2/4 band and servo component malfunction
•  Direct clutch component malfunction
•  Transaxle case malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
Powertrain control system
•  Are there any malfunctions with the following?
―  Electrical input/output
―  Vehicle wiring harness
―  PCM
―  Electrical pressure control (EPC) solenoid
―  Throttle position (TP) sensor
―  Vehicle speedometer sensor (VSS)
―  Mass air flow (MAF) sensor
―  3-2 timing/coasting clutch solenoid (3-2T/CCS)
Yes
Perform OBD test
Perform DTC troubleshooting
No
Go to the next step
2
Control valve body
•  Do any of the following malfunctions exist?
―  Bolts are not tightened to the specification
―  Gasket is damaged
―  3-2 Timing valve, solenoid regulator valve, 3-2 control valve are stuck, damaged, or misassembled
―  3-2T/CCS solenoid malfunction
―  Pressure tap plate/gasket leaks or is damaged
―  Separator plates are damaged or blocked
Yes
Service if necessary
No
Go to the next step
3
Oil pump
•  Do any of the following malfunctions exist?
―  Bolts are not tightened to the specification
―  Gaskets are damaged
―  Porosity/cross leaks
―  Pump support seal Rings #4, 5, 6 are damaged or misassembled
―  Forward to direct passage leaks
Yes
Service if necessary
No
Go to the next step
4
2/4 band and servo component
•  Do any of the following malfunctions exist?
―  2/4 band and/or reverse clutch drum component are damaged, worn, or misassembled
―  Servo piston are damaged
―  Servo return and cushion springs are damaged, or misassembled
―  Springs are damaged or misassembled
―  Servo rod is bent or damaged
Yes
Service if necessary
No
Go to the next step
5
Direct clutch component
•  Do any of the following malfunctions exist?
―  Return spring is damaged or broken
―  Friction elements is damaged or worn
―  The check ball is not releasing
―  Piston or seal is damaged
Yes
Service if necessary
No
Go to the next step
6
Transaxle case
•  Do any of the following malfunctions exist?
―  Band anchor is damaged
―  Leakage in the servo apply/release circuits
―  Case bore is damaged (Servo Rod)
Yes
Service if necessary
No
The malfunction is not in the automatic transaxle
Go to the engine symptom troubleshooting
7
•  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.