Inspection Procedure 10: Shift Shock and Slipping

COMMENTS ON TROUBLE SYMPTOM

PROBABLE CAUSES

Malfunction of each solenoid valve
Abnormal line pressure
Malfunction of valve body
Malfunction of oil pump
Malfunction of each brake or each clutch
Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

Item 01: Low-reverse solenoid valve
Item 02: Underdrive solenoid valve
Item 03: Second solenoid valve
Item 04: Overdrive solenoid valve

OK: Operating sound can be heard.

Q. Is the check result normal?

	Go to Step 2.

	Replace the defective solenoid valve.

STEP 2. M.U.T.-III data list

Item 11: Shift position (Refer to data list reference table ).
Item 12, 13, 14, 15: Each solenoid valve duty ratio (Refer to data list reference table ).

Q. Is the check result normal?

	Go to Step 3.

	Replace the A/T-ECU.

STEP 3. Hydraulic pressure test

Check all hydraulic pressures within the standard value.

OK: Refer to .

Q. Is the check result normal?

	Go to Step 6.

	Go to Step 4.

STEP 4. Line pressure adjustment

(1)Adjust the line pressure (Refer to

(2)Test drive the vehicle.

(3)Verify that the condition described by the customer exists.

Q. Does a malfunction take place again?

	Go to Step 5.

	The inspection is complete.

STEP 5. Valve body disassembly clean and assembly

(1)Check the bolts for looseness and the O-ring, solenoid valve and valve body for damage.
Replace the valve body assembly if the damages are thought to be irreparable.

(2)Test drive the vehicle.

(3)Verify that the condition described by the customer exists.

Q. Does a malfunction take place again?

	Check the oil pump for incorrect installation, damage and etc., and replace the oil pump assembly if necessary (The oil pump cannot be disassembled).

	The inspection is complete.

STEP 6. Each clutch and brake check

Check the facing for seizure and the piston seal ring for damage and interference with the retainer.

Q. Is the check result normal?

	The inspection is complete.

	Repair or replace each clutch and brake.