NO.22 SHIFT CONCERN: HARSH 1–2 SHIFT[LA4AX-EL (CD4E)]

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22

Shift concern: harsh 1–2 shift

POSSIBLE CAUSE

•  Powertrain control system malfunction

•  Control valve body malfunction

•  Oil pump malfunction

•  2/4 band and servo component malfunction

•  Forward clutch component malfunction

•  Transaxle case malfunction

22	Shift concern: harsh 1–2 shift
POSSIBLE CAUSE	• Powertrain control system malfunction • Control valve body malfunction • Oil pump malfunction • 2/4 band and servo component malfunction • Forward 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 ― Turbine shaft speed (TSS) sensor ― Throttle position (TP) sensor ― Vehicle speedometer sensor (VSS) ― Mass air flow (MAF) sensor ― TCC ― 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	Control valve body • Do any of the following malfunctions exist? ― Bolts are not tightened to the specification ― Gasket leaks ― 2/4 accumulator valve, 3-2 control valve (also harsh 3-4 shift) are stuck, damaged, or misassembled ― Separator plates are damaged ― Hydraulic passages are damaged	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 ― Oil pump support seal rings #3 and #4 are damaged ― Porosity/cross leakage	Yes	Service if necessary
3		No	Go to the next step
4	2/4 band and servo component • Do any of the following malfunctions exist? ― Cushion return springs are damaged ― Band is damaged, worn ― 2/4 band and/or reverse clutch drum component are worn, damaged, or misassembled	Yes	Service if necessary
4		No	Go to the next step
5	Forward clutch component • Do any of the following malfunctions exist? ― Seals are damaged ― Return spring is damaged ― Friction elements are damaged	Yes	Service if necessary
5		No	Go to the next step
6	Transaxle case • Is the band anchor area damaged?	Yes	Service if necessary
6	Transaxle case • Is the band anchor area damaged?	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.