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

PROBABLECAUSES

Malfunction of the engine: Engine output change
Malfunction of the A/T-ECU
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 PROCEDURE

STEP 1. Check the engine performance.

Check the engine-ECU side especially for throttle signal-related abnormality.
Check the stall speed (refer to ). If the speed is low, check the engine side.

Q. Is the check result normal?

	Go to Step 2.

	Repair the failure, and perform adjustment.

STEP 2. Replace the A/T-ECU.

Q. Is the failure resolved?

	The procedure is complete.

	Go to Step 3.

STEP 3. Perform a hydraulic test.

Refer to

Q. Is the check result normal?

	The procedure is complete.

	Go to Step 4.

STEP 4. Compare with another same model vehicle.

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

	Go to Step 5.

	The procedure is complete.

STEP 5. Remove the transmission assembly from the vehicle.

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

Q. Is the check result satisfactory?

	Replace the transmission assembly.

	Replace the failure part.