Sentra 2007

Continually Variable Transmission (CVT)

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CVT Fluid Cooler Cleaning, Diagnosis, And Inspection



Specific to:

Nissan Sentra 2007-2012

Whenever an automatic transaxle is repaired, overhauled, or replaced, the CVT fluid cooler mounted in the radiator must be inspected and cleaned. Metal debris and friction material, if present, can be trapped or be deposited in the CVT fluid cooler. This debris can contaminate the newly serviced CVT or, in severe cases, can block or restrict the flow of CVT fluid. In either case, malfunction of the newly serviced CVT may occur. Debris, if present, may deposit as CVT fluid enters the cooler inlet. It will be necessary to back flush the cooler through the cooler outlet in order to flush out any built up debris.

CVT FLUID COOLER CLEANING PROCEDURE

  1. Position an oil pan under the transaxle's inlet and outlet cooler hoses.
  2.  
  3. Identify the inlet and outlet fluid cooler hoses.
  4.  
  5. Disconnect the fluid cooler inlet and outlet rubber hoses from the steel cooler tubes or bypass valve.
    NOTE
    Replace the cooler hoses if rubber material from the hose remains on the tube fitting.

  6.  
  7. Allow any CVT fluid that remains in the cooler hoses to drain into the oil pan.
  8.  
  9. Insert the extension adapter hose of a can of Transmission Cooler Cleaner (Nissan P/N 999MP AM006) into the cooler outlet hose.
    CAUTION
    Wear safety glasses and rubber gloves when spraying the Transmission Cooler Cleaner. Spray Transmission Cooler Cleaner only with adequate ventilation. Avoid contact with eyes and skin. Never breath vapors or spray mist.

  10.  
  11. Hold the hose and can as high as possible and spray Transmission Cooler Cleaner in a continuous stream into the cooler outlet hose until CVT fluid flows out of the cooler inlet hose for 5 seconds.
  12.  
  13. Insert the tip of an air gun into the end of the cooler outlet hose.
  14.  
  15. Wrap a shop rag around the air gun tip and end of the cooler outlet hose.
  16.  
  17. Blow compressed air regulated to 70 to 130 psi through the cooler outlet hose for 10 seconds to force out any remaining CVT fluid.
  18.  
  19. Repeat steps 5 through 9 three additional times.
  20.  
  21. Position an oil pan under the banjo bolts that connect the CVT fluid cooler steel lines to the transaxle.
  22.  
  23. Remove the banjo bolts.
  24.  
  25. Flush each steel line from the cooler side back toward the transaxle by spraying Transmission Cooler Cleaner in a continuous stream for 5 seconds.
  26.  
  27. Blow compressed air regulated to 70 to 130 psi through each steel line from the cooler side back toward the transaxle for 10 seconds to force out any remaining CVT fluid.
  28.  
  29. Ensure all debris is removed from the steel cooler lines.
  30.  
  31. Ensure all debris is removed from the banjo bolts and fittings.
  32.  
  33. Perform -CVT FLUID COOLER DIAGNOSIS PROCEDURE-.
  34.  

CVT FLUID COOLER DIAGNOSIS PROCEDURE


NOTE
Insufficient cleaning of the cooler inlet hose exterior may lead to inaccurate debris identification.

  1. Position an oil pan under the transaxle's inlet and outlet cooler hoses.
  2.  
  3. Clean the exterior and tip of the cooler inlet hose.
  4.  
  5. Insert the extension adapter hose of a can of Transmission Cooler Cleaner (Nissan P/N 999MP AM006) into the cooler outlet hose.
    CAUTION
    Wear safety glasses and rubber gloves when spraying the Transmission Cooler Cleaner. Spray Transmission Cooler Cleaner only with adequate ventilation. Avoid contact with eyes and skin. Never breath vapors or spray mist.

  6.  
  7. Hold the hose and can as high as possible and spray Transmission Cooler Cleaner in a continuous stream into the cooler outlet hose until CVT fluid flows out of the cooler inlet hose for 5 seconds.
  8.  
  9. Tie a common white, basket-type coffee filter to the end of the cooler inlet hose.
  10.  
  11. Insert the tip of an air gun into the end of the cooler outlet hose.
  12.  
  13. Wrap a shop rag around the air gun tip and end of cooler outlet hose.
  14.  
  15. Blow compressed air regulated to 70 to 130 psi through the cooler outlet hose to force any remaining CVT fluid into the coffee filter.
  16.  
  17. Remove the coffee filter from the end of the cooler inlet hose.
  18.  
  19. Perform -CVT FLUID COOLER INSPECTION PROCEDURE-.
  20.  

CVT FLUID COOLER INSPECTION PROCEDURE

  1. Inspect the coffee filter for debris.
    1. If small metal debris less than 0.040 in. (1 mm) in size or metal powder is found in the coffee filter, this is normal. If normal debris is found, the CVT fluid cooler/radiator can be reused and the procedure is ended.
    2.  
    3. If one or more pieces of debris are found that are over 0.040 in. (1 mm) in size and/or peeled clutch facing material is found in the coffee filter, the fluid cooler is not serviceable. The radiator/ fluid cooler must be replaced and the inspection procedure is ended.
    4.  

  2.  
  3. After performing all procedures, ensure that all remaining oil is cleaned from all components.
  4.  

Drain & Refill



Specific to:

Nissan Sentra 2007-2012

  1. Remove the drain plug from the oil pan and drain the CVT fluid.
  2.  
  3. Remove the drain plug gasket from the drain plug.
  4.  
  5. Install the drain plug gasket to the drain plug. Never reuse the drain plug gasket.
  6.  
  7. Install the drain plug to the oil pan.
  8.  
  9. Fill the CVT fluid from the CVT fluid charging pipe to the specified level.
    WARNING
    Use only Genuine NISSAN CVT Fluid NS-2. Never mix with other fluid. Using CVT fluid other than Genuine NISSAN CVT Fluid NS-2 will deteriorate in driveability and CVT durability, and may damage the CVT, which is not covered by the warranty.


    NOTE
    When filling the CVT fluid, take care not to scatter heat generating parts such as exhaust. Sufficiently shake the container of CVT fluid before using. Delete CVT fluid deterioration date with CONSULT-III after changing CVT fluid.

  10.  
  11. With the engine warmed up, drive the vehicle in an urban area.
    NOTE
    When ambient temperature is 68°F (20°C), it takes about 10 minutes for the CVT fluid to warm up to 122 to 176°F (50 to 80°C).

  12.  
  13. Check the CVT fluid level and condition.
  14.  
  15. Repeat steps 1 to 5 if CVT fluid has been contaminated.
  16.  

 
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