Inspection Procedure 9

INSPECTION PROCEDURE 9: The shift shock is large at a certain gear shift. (1st to 2nd, 2nd to 3rd, etc.)

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

- Malfunction of the engine: Engine output change

- Malfunction of the TCM

- A/T failure: Hydraulic system (valve body assembly), driving force transmission system (clutch/brake)

NOTE:
When the engine output is low, shock occurs. Care must also be taken during cold, after warm up, and temperature, humidity, and air pressure differences.

DIAGNOSIS

STEP 1. Check the engine performance.

- Check the ECM side especially for throttle signal-related abnormality.

- Check the stall speed (refer to Torque Converter Stall Test). If the speed is low, check the engine side.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the failure, and perform adjustment.
STEP 2. Replace the TCM.

Q. Is the failure resolved?

YES The procedure is complete.
NO Go to Step 3.
STEP 3. Perform a hydraulic test.

Refer to Hydraulic Pressure Test.

Q. Is the check result normal?

YES The procedure is complete.
NO Go to Step 4.
STEP 4. Compare with another same model vehicle.

Q. Is there a difference from the same model vehicle?

YES Go to Step 5.
NO The procedure is complete.
STEP 5. Remove the transaxle assembly from the vehicle.

Disassemble and check the transaxle assembly to check if there is a foreign material inside.

Q. Is the check result satisfactory?

YES Replace the transaxle assembly.
NO Replace the failure part.