NO.26 SHIFT CONCERN: HARSH 3–2 SHIFT (AUTOMATIC)[LA4AX-EL (CD4E)]

id0503a2806100

26

Shift concern: harsh 3–2 shift (automatic)

POSSIBLE CAUSE

•  Powertrain control system malfunction

•  Control valve body malfunction

•  Oil pump malfunction

•  Direct clutch component malfunction

•  2/4 band and servo component malfunction

•  Transaxle case malfunction

26	Shift concern: harsh 3–2 shift (automatic)
POSSIBLE CAUSE	• Powertrain control system malfunction • Control valve body malfunction • Oil pump malfunction • Direct clutch component malfunction • 2/4 band and servo 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 range (TR) switch ― Vehicle speedometer sensor (VSS) ― 3-2 timing/coasting clutch solenoid (3-2T/CCS) ― Transaxle fluid temperature (TFT) sensor ― Mass air flow (MAF) sensor ― Throttle position (TP) sensor ― Turbine shaft speed (TSS) sensor ― TCC solenoid	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 ― Gasket is damaged ― 3-2 timing valve, solenoid regulator valve, 3-2 control valve are stuck, damaged, or misassembled ― Hydraulic passages are damaged ― Separator plates are damaged or blocked ― 3-2T/CCS solenoid malfunction	Yes	Service if necessary
2		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 are damaged or misassembled	Yes	Service if necessary
3		No	Go to the next step
4	Direct clutch component • Do any of the following malfunctions exist? ― Return springs are damaged or broken ― Friction elements are damaged or worn ― Verify that the check ball is not exhausting ― Servo rod is bent or damaged	Yes	Service if necessary
4		No	Go to the next step
5	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 is damaged ― Servo return and cushion springs are damaged or misassembled ― Springs are damaged or misassembled	Yes	Service if necessary
5		No	Go to the next step
6	Transaxle case • Do any of the following malfunctions exist? ― Band anchor is damaged ― Leaks ― Servo rod bore is damaged	Yes	Service if necessary
6		No	The malfunction is not in the automatic transaxle Go to the engine symptom troubleshooting (See ENGINE SYMPTOM TROUBLESHOOTING[AJ (3.0L Duratec)].)
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.