Inspection Procedure 7: The Fluid Temperature Warning Lamp Illuminates Too Frequently

Inspection Procedure 7: The fluid temperature warning lamp illuminates too frequently.

PROBABLE CAUSES
^ Thermal deterioration of the transmission fluid
^ Damaged wiring harness and connectors
^ Malfunction of the transmission fluid temperature sensor
^ Clogged coolant system
^ Clogged air-cooled transmission fluid cooler system
^ Malfunction of the thermo valve
^ Malfunction of TCM
^ Malfunction of CVT assembly

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III special function
Check the deterioration level of the transmission fluid.

NOTE: The transmission fluid deterioration level is the accumulation of the values counted depending on the fluid temperature of a certain period of time, and it shows the thermal deterioration level of the transmission fluid.

Q: Is the deterioration level of the transmission fluid less than 210,000?
YES: Go to Step 2.
NO: Replace the transmission Fluid.

STEP 2. M.U.T.-III data list
Item 5: Transmission fluid temperature sensor.

Q: Is the check result normal?
YES: Go to Step 3.
NO: Diagnosis code No. P0712, P0713: Diagnose the transmission fluid temperature sensor.

STEP 3. Air-cooled transmission fluid cooler system clogging check [2.4 L engine]
Check if the air cooled transmission fluid cooler system is clogged according to the following procedure.

CAUTION:
Do not reuse the drained transmission fluid.

1) Remove the transmission fluid cooler hose assembly.





2) Blow air into the transmission fluid cooler hose assembly, and check that the air comes out from the opposite side.
3) Blow air into the air-cooled transmission fluid cooler (A in the figure), and check that the air comes out from the opposite side (B in the figure).
4) Install the parts, and replenish the transmission fluid to the specified quantity.

Q: Is the check result normal?
YES: Go to Step 4.
NO: Replace the part(s) having damage or other problems.

STEP 4. Thermo valve check

Q: Is the check result normal?
YES: Go to Step 5.
NO: Replace the thermo valve.

STEP 5. Coolant system clogging check
Check if the coolant system is clogged according to the following procedure.

CAUTION:
Do not reuse the drained coolant.

1) Drain the coolant.
2) Remove water feed hose A, water feed hose B and water return hose A.





3) Blow air into the removed parts, and check that the air comes out from the opposite side.
4) Blow air into the coolant outlet (A in the figure), and check that the air comes out from the opposite side (B in the figure).
5) Install the parts, and replenish the coolant to the specified quantity.

Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace the part(s) having damage or other problems.

STEP 6. Retest the system.

Q: Does a malfunction take place again?
YES: Replace the CVT assembly.
NO: Intermittent malfunction