Inspection Procedure 4: Poor Acceleration or Incomplete Shifting Operation

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

Q: Is the check result normal?
YES: Go to Step 4.
NO (stall speed is low.): Replace the torque converter.
NO (stall speed is high.): Go to Step 3.

STEP 3. 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.

STEP 4. 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.