NO.14 SHIFT CONCERN: NO 2–3 SHIFT[LA4AX-EL (CD4E)]

id0503a2804200

14

Shift concern: no 2–3 shift

POSSIBLE CAUSE

•  Powertrain control system malfunction

•  Improper pressure

•  Control valve body malfunction

•  Oil pump malfunction

•  Direct clutch component malfunction

•  2/4 servo malfunction

•  Transaxle case malfunction

14	Shift concern: no 2–3 shift
POSSIBLE CAUSE	• Powertrain control system malfunction • Improper pressure • Control valve body malfunction • Oil pump malfunction • Direct clutch component malfunction • 2/4 servo malfunction • Transaxle case malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Powertrain control system • Do any of the following malfunctions exist? ― Electrical input/output ― Vehicle wiring harness ― PCM ― Shift solenoid No.1 (SS1), Shift solenoid No.2 (SS2) ― Transaxle range (TR) switch	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	Improper pressure • Do any of the following malfunctions exist? ― High line pressure ― Low line pressure (See MECHANICAL SYSTEM TEST[LA4AX-EL (CD4E)].)	Yes	Go to the next step
2		No	Go to step 5
3	Control valve body • Do any of the following malfunctions exist? ― Bolts are not tightened to the specification ― Gasket leaks ― 2-3 shift valve (no fourth gear engagement also), main regulator valve are stuck, damaged, or misassembled ― SS1, SS2 malfunction (no fourth gear engagement also) ― Separator plates are damaged ― Pressure tap plate/gasket leaks ― Hydraulic passages are damaged	Yes	Service if necessary
3		No	Go to the next step
4	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 and #5, are damaged	Yes	Service if necessary
4		No	Go to the next step
5	Direct clutch component • Do any of the following malfunctions exist? ― Seals or piston is damaged ― Piston bore is damaged ― Friction elements are severely damaged, worn ― Check ball is not seated properly ― Return spring component is damaged ― Cylinder bore/splines is damaged ― Shell/hub are damaged	Yes	Service if necessary
5		No	Go to the next step
6	2/4 servo • Do any of the following malfunctions exist? ― Piston or piston bore is damaged ― Rod bore or rod is damaged or leaking	Yes	Service if necessary
6		No	Go to the next step
7	Transaxle case • Does the following malfunction exist? ― Leakage in the servo apply, servo release or direct clutch circuits	Yes	Service or replace case if necessary
7		No	The malfunction is not in the automatic transaxle Go to the engine symptom troubleshooting (See ENGINE SYMPTOM TROUBLESHOOTING[AJ (3.0L Duratec)].)
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.