Inspection Procedure 9

INSPECTION PROCEDURE 9: Shift Shock and Slipping

COMMENT

If shift shock when driving is due to upshifting or downshifting and the transaxle speed become higher than the engine speed, the cause is probably abnormal line pressure or a malfunction of a solenoid valve, oil pump, valve body or of a brake or clutch.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CONDITION:)

- Abnormal line pressure
- Malfunction of each solenoid valve
- Malfunction of the oil pump
- Malfunction of the valve body
- Malfunction of each brake or each clutch
- Malfunction of the PCM

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, check actuator test.





(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Set scan tool MB991958 to the actuator test mode for following items.
1. Item 1: Low-reverse solenoid valve

2. Item 2: Underdrive solenoid valve

3. Item 3: Second solenoid valve

4. Item 4: Overdrive solenoid valve

5. Item 5: Reduction solenoid valve [5A/T]

- An audible clicking or buzzing should be heard when the solenoid valves are energized.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Are the solenoid valves operating properly?

YES Go to Step 2.

NO Repair or replace the solenoid valves. Valve Body Disassembly and Assembly Valve Body Valve Body Disassembly and Assembly. Then confirm that the symptom is eliminated.

STEP 2. Check the hydraulic pressure.

(1)Measure the hydraulic pressure of each element. Check if each hydraulic pressure is within the standard value. Refer to Hydraulic Pressure Test, Hydraulic Pressure Test.

(2)If some elements pressure are within the standard value and some are not, recheck the symptom.

Q. Are all hydraulic pressures within the standard value?

YES Go to Step 6.
NO Go to Step 3.
STEP 3. Adjust the line pressure.

Adjust the line pressure. Refer to Adjustments, Line Pressure Adjustment.
Then check the symptom.

Q. Is the symptom eliminated?

YES The procedure is complete.
NO Go to Step 4.
STEP 4. Disassemble and clean the valve body.





Check the O-ring installation bolts for looseness and the valve body for damage. Repair or replace the faulty parts. Valve Body Disassembly and Assembly Valve Body Valve Body Disassembly and Assembly.
Replace the valve body assembly if the damages are thought to be irreparable. Then check the symptom.

Q. Is the symptom eliminated?

YES The procedure is complete.

NO Go to Step 5.

STEP 5. Check the oil pump.

(1)Remove the transaxle.





(2)Check the oil pump (incorrect installation, damage and etc.) and replace the oil pump assembly if necessary (The oil pump cannot be disassembly). Transaxle Disassembly and Assembly Transaxle Transaxle Disassembly and Assembly. Confirm that the malfunction symptom is eliminated.

Q. Is the symptom eliminated?

YES The procedure is complete.

NO Go to Step 7.

STEP 6. Check each brake and clutch.

(1)Remove the transaxle.









(2)Check the facing for seizure and piston seal ring for damage and interference with retainer.
Repair or replace the faulty parts. Transaxle Disassembly and Assembly, Underdrive Clutch and Input Shaft Underdrive Clutch and Input Shaft Disassembly and Assembly, Reverse and Overdrive Clutch Reverse and Overdrive Clutch Disassembly and Assembly Transaxle Transaxle Disassembly and Assembly, Underdrive Clutch and Input Shaft Underdrive Clutch and Input Shaft Disassembly and Assembly, Reverse and Overdrive Clutch Reverse and Overdrive Clutch Disassembly and Assembly. Then Retest the system.

Q. Is the symptom eliminated?

YES The procedure is complete.

NO Go to Step 7.

STEP 7. Replace the PCM.

When the PCM is replaced, register the encrypted code. Immobilizer System.

Q. Is the symptom eliminated?

YES The procedure is complete.
NO Start over at Step 1.