Inspection Procedure 4

Inspection Procedure 4: Poor Acceleration or Incomplete Shifting Operation

SYMPTOMS

Vehicle does not creep. Incomplete shifting operation or extremely poor acceleration is observed.

PROBABLE CAUSES

- Malfunction of forward clutch

- Malfunction of torque converter

- Malfunction of CVT assembly

- Malfunction of valve body assembly

- Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. Engine-related troubleshooting check

Check for engine malfunction.

Q. Is the check result normal?

YES Go to Step 2.
NO Carry out the engine-related troubleshooting.
STEP 2. Torque converter stall test implementation

Refer to Torque Converter Stall Test.

Q. Is the check result normal?

YES Go to Step 3.
NO (stall speed is low.) : Replace the torque converter.
NO (stall speed is high.) : Go to Step 4.
STEP 3. Forward clutch pressure check

Carry out "hydraulic test"(Refer to Hydraulic Pressure Test).

Q. Is the check result normal?

YES Replace the forward clutch.
NO Replace the valve body assembly.
STEP 4. Retest the system.

Replace TCM, and then recheck symptoms.

Q. Does the malfunction take place again?

YES Replace the CVT assembly.
NO The inspection is complete.