NO.3 HARSH ENGAGEMENT[LA4AX-EL (CD4E)]

id0503a2806600

3

Harsh engagement

POSSIBLE CAUSE

•  ATF

•  Powertrain control system malfunction

•  Improper pressure

•  Control valve body malfunction

•  Oil filter and seal malfunction

•  Internal and external linkage malfunction

•  Joint shafts malfunction

•  Engine mount malfunction

•  Forward clutch component (Forward only) malfunction

•  Reverse clutch component (Reverse only) malfunction

•  Low/reverse clutch component (Reverse only) malfunction

•  Direct clutch component (Reverse only) malfunction

3	Harsh engagement
POSSIBLE CAUSE	• ATF • Powertrain control system malfunction • Improper pressure • Control valve body malfunction • Oil filter and seal malfunction • Internal and external linkage malfunction • Joint shafts malfunction • Engine mount malfunction • Forward clutch component (Forward only) malfunction • Reverse clutch component (Reverse only) malfunction • Low/reverse clutch component (Reverse only) malfunction • Direct clutch component (Reverse only) malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	ATF • Are there any problems with the following? ― Level ― Condition (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[LA4AX-EL (CD4E)].)	Yes	Service if necessary
1		No	Go to the next step
2	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 ― 3-2 timing/coasting clutch solenoid (3-2 T/CCS) (Harsh forward only)	Yes	Run OBD test Perform DTC troubleshooting (See AUTOMATIC TRANSAXLE ON-BOARD DIAGNOSTIC FUNCTION[LA4AX-EL (CD4E)].)
2		No	Go to the next step
3	Improper pressure • Is the line pressure higher than normal? (See MECHANICAL SYSTEM TEST[LA4AX-EL (CD4E)].)	Yes	Verify engagements at minimum EPC using the transaxle tester If the line pressure remains high, inspect the following components: control valve body, oil filter, and seal component
3		No	Go to the next step
4	Control valve body • Do any of the following malfunctions exist? ― Bolts are not tightened to the specification ― Gaskets are damaged ― Low/reverse accumulator piston and spring (Reverse), main regulator valve, coast clutch valve (Forward) are damaged, missing, stuck, or misassembled ― Accumulator piston and spring are misassembled, stuck, or damaged ― EPC solenoid is stuck, or damaged	Yes	Service if necessary
4		No	Go to the next step
5	Oil Filter and seal component • Do any of the following malfunctions exist? ― Filter/seal is damaged or plugged ― Recirculation seal is damaged, plugged, or out of position	Yes	Replace if necessary
5		No	Go to the next step
6	Internal or external shift linkages • Do any of the following malfunctions exist? ― Damage ― Misadjustment	Yes	Service if necessary
6		No	Go to the next step
7	Joint shafts • Is there spline damage? (See AUTOMATIC TRANSAXLE REMOVAL[LA4AX-EL (CD4E)].) (See AUTOMATIC TRANSAXLE INSTALLATION[LA4AX-EL (CD4E)].)	Yes	Service if necessary
7		No	Go to the next step
8	Engine mounts • Do any of the following malfunctions exist? ― Loose, broken, missing, or misaligned parts ― Powertrain is contacting with other vehicle components (See AUTOMATIC TRANSAXLE REMOVAL[LA4AX-EL (CD4E)].) (See AUTOMATIC TRANSAXLE INSTALLATION[LA4AX-EL (CD4E)].)	Yes	Service if necessary
8		No	Go to the next step
9	F/C/D clutch component (Forward only) • Do any of the following malfunctions exist? ― Forward/coasting/direct (F/C/D) clutch cylinders are damaged ― Piston bore is damaged ― Friction elements are damaged or worn ― Forward clutch return spring is damaged or missing ― Inspect the ball for damage ― Piston or seals are damaged	Yes	Service if necessary
9		No	Go to the next step
10	Reverse clutch component (Reverse only) • Do any of the following malfunctions exist? ― Seals or piston are damaged ― Reverse piston is damaged ― Friction elements are damaged, worn, or misassembled ― Return spring component is damaged or worn ― Ball check valve is damaged or missing	Yes	Service if necessary
10		No	Go to the next step
11	Low/reverse clutch component (Reverse only) • Do any of the following malfunctions exist? ― Seals or piston are damaged ― Wave spring is damaged ― Friction elements are damaged, worn, misassembled ― Return spring component is damaged, worn, or misassembled ― Piston bore is damaged	Yes	Service if necessary
11		No	Go to the next step
12	Direct clutch component (Reverse only) • Are any of the friction elements severely damaged?	Yes	Service if necessary
12		No	The problem is resolved
13	• 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.