NO.13 SHIFT CONCERN: NO 1–2 SHIFT[LA4AX-EL (CD4E)]

id0503a2804100

13

Shift concern: no 1–2 shift

POSSIBLE CAUSE

•  Powertrain control system malfunction

•  Improper pressure

•  Control valve body malfunction

•  2/4 band and servo malfunction

•  Low OWC component malfunction

•  Reverse/fourth gear (REV/4GR) sun gear and shell malfunction

•  Transaxle case malfunction

13	Shift concern: no 1–2 shift
POSSIBLE CAUSE	• Powertrain control system malfunction • Improper pressure • Control valve body malfunction • 2/4 band and servo malfunction • Low OWC component malfunction • Reverse/fourth gear (REV/4GR) sun gear and shell 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 4
3	Control valve body • Do any of the following malfunctions exist? ― Bolts are not tightened to the specification ― Gaskets are damaged ― 1-2 shift valve, 2/4 accumulator, main regulator valve are stuck, damaged, or misassembled ― SS1, SS2 malfunction ― Pressure tap plate/gasket are damaged ― Separator plates are damaged ― Hydraulic passages are damaged	Yes	Service if necessary
3		No	Go to the next step
4	2/4 band and servo component (No fourth gear engagement also) • Do any of the following malfunctions exist? ― Seals are damaged or missing ― Piston is damaged ― Band is damaged or worn ― Springs are damaged ― Servo rod or rod bore is damaged	Yes	Service if necessary
4		No	Go to the next step
5	Low OWC component • Is there any damage?	Yes	Service if necessary
5	Low OWC component • Is there any damage?	No	Go to the next step
6	Reverse/fourth gear sun gear and shell • Do any of the following malfunctions exist? ― Damaged, or broken weld ― Lugs are damaged	Yes	Service if necessary
6		No	Go to the next step
7	Transaxle case • Do any of the following malfunctions exist? ― Band anchor area is damaged ― Porosity/leakage in servo apply, servo release 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.