NO.16 SHIFT CONCERN: SOFT/SLIPPING 1–2 SHIFT[LA4AX-EL (CD4E)]

id0503a2804400

16

Shift concern: soft/slipping 1–2 shift

POSSIBLE CAUSE

•  Powertrain control system malfunction

•  Control valve body malfunction

•  2/4 band and servo component malfunction

•  Forward OWC component malfunction

•  Forward clutch component malfunction

•  Low OWC component malfunction

•  Low/reverse clutch component malfunction

•  Transaxle case malfunction

16	Shift concern: soft/slipping 1–2 shift
POSSIBLE CAUSE	• Powertrain control system malfunction • Control valve body malfunction • 2/4 band and servo component malfunction • Forward OWC component malfunction • Forward clutch component malfunction • Low OWC component malfunction • Low/reverse 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 ― Transaxle fluid temperature (TFT) sensor	Yes	Perform OBD test Perform DTC troubleshooting (See AUTOMATIC TRANSAXLE ON-BOARD DIAGNOSTIC FUNCTION[LA4AX-EL (CD4E)].)
1		No	Go to the next step
2	Control valve body • Do any of the following malfunctions exist? ― Bolts are not tightened to the specification ― Gaskets are damaged ― 2/4 accumulator piston plug and seal (also soft 3-4 shift), main regulator valve, or line modulator valve (also soft 3-4 shift) are stuck, damaged, or misassembled ― Hydraulic passages are damaged ― Pressure tap plate/gasket is damaged ― Separator plates are damaged	Yes	Service if necessary
2		No	Go to the next step
3	2/4 band and servo component • Do any of the following malfunctions exist? ― Piston seals or piston bore are damaged, or missing ― Servo rod or rod bore is damaged ― 2/4 band and/or reverse clutch drum component are worn, damaged, or misassembled ― Springs are damaged ― Servo cover and seal are damaged	Yes	Service if necessary
3		No	Go to the next step
4	Forward OWC component (Slips in first gear) • Is the forward OWC component damaged or not holding?	Yes	Service if necessary
4		No	Go to the next step
5	Forward clutch component (Slip in first gear) • Do any of the following malfunctions exist? ― Seals are damaged ― Return spring is damaged ― Friction elements are damaged ― Pump support seals #3, #4 are damaged	Yes	Service if necessary
5		No	Go to the next step
6	Low OWC component • Is the low OWC component damaged or slipping?	Yes	Service if necessary
6		No	Go to the next step
7	Low/reverse clutch component • Is there any severe friction damage?	Yes	Service if necessary
7		No	Go to the next step
8	Transaxle case • Do any of the following malfunctions exist? ― Band anchor is damaged ― Porosity/leakage in servo apply/servo release circuits	Yes	Service if necessary
8		No	The malfunction is not in the automatic transaxle Go to the engine symptom troubleshooting (See ENGINE SYMPTOM TROUBLESHOOTING[AJ (3.0L Duratec)].)
9	• 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.