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 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." 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.