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Continuously Variable Transmission (Cvt): Maintenance Nissan Versa I

Automatic Trans 14 illustrations ~1390 words

CVT FLUID COOLER SERVICE

If CVT fluid contains friction material (clutches, brakes, etc.), or if an CVT is replaced, inspect and clean the CVT fluid cooler mounted in the radiator or replace the radiator. Flush cooler lines using cleaning solvent and compressed air after repair. For CVT fluid cooler cleaning procedure, refer to " CVT FLUID COOLER CLEANING ". For radiator replacement, refer to " RADIATOR ".

FLUID LEVEL CHECK

Fluid level should be checked with the fluid warmed up to 50 to 80°C (122 to 176°F).

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Scheme 54: FLUID LEVEL CHECK
Scheme 54: FLUID LEVEL CHECK

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Scheme 56
  1. Check for fluid leakage.
  2. With the engine warmed up, drive the vehicle to warm up the CVT fluid. When ambient temperature is 20°C (68°F), it takes about 10 minutes for the CVT fluid to warm up to 50 to 80°C (122 to 176°F).
  3. Park the vehicle on a level surface and set the parking brake.
  4. With engine at idle, while depressing brake pedal, move the selector lever throughout the entire shift range and return it to the "P" position.
  5. Press the tab on the CVT fluid level gauge to release the lock and pull out the CVT fluid level gauge from the CVT fluid charging pipe.
  6. Wipe fluid off the CVT fluid level gauge. Then rotate the CVT fluid level gauge 180° and re-insert it into the CVT charging pipe as far as it will go. CAUTION: Always use lint free paper towels to wipe fluid off the CVT fluid level gauge.
  7. Remove the CVT fluid level gauge and check that the fluid level is within the specified range as shown. If the fluid level is at or below the low side of the range, add the necessary specified NISSAN CVT fluid through the CVT charging pipe. Fluid grade: Refer to " «FLUIDS AND LUBRICANTS»(ref-319466-S33479922702009062600000) ". CAUTION: Only use specified NISSAN CVT fluid. Do not overfill the CVT.
  8. Install the CVT fluid level gauge to the CVT fluid charging pipe until it locks. CAUTION: When CVT fluid level gauge is installed into the CVT fluid charging pipe, make sure that the CVT fluid level gauge is securely locked in place.

FLUID CONDITION CHECK

Fluid statusConceivable causeRequired operation
Varnished (viscous varnish state)Clutch, brake scorchedReplace the CVT fluid and check the CVT main unit and the vehicle for malfunctions (wire harness, cooler pipes, etc.)
Milky white or cloudyWater in the fluidReplace the CVT fluid and check for places where water is getting in.
Large amount of metal powder mixed in fluidUnusual wear of sliding parts within CVTReplace the CVT fluid and check for improper operation of the CVT.

FLUID CONDITION CHART

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Scheme 57
Scheme 57

Scheme 58

Scheme 58: Changing CVT Fluid
Scheme 58: Changing CVT Fluid
  1. Warm up CVT fluid by driving the vehicle for 10 minutes. <== : Vehicle front Radiator (2) CVT fluid cooler hose [inlet side (3)] Transaxle assembly (4)
  2. Drain CVT fluid from CVT fluid cooler hose [outlet side (1)] and refill with new specified NISSAN CVT fluid in the CVT fluid charging pipe with the engine running at idle speed. Fluid capacity and grade: Refer to " «FLUIDS AND LUBRICANTS»(ref-319466-S33479922702009062600000) ". CAUTION: Only use the specified NISSAN CVT fluid.
  3. Refill until new CVT fluid comes out from CVT fluid cooler hose [outlet side (1)]. NOTE: About 30 to 50% extra fluid will be required for this procedure.
  4. Check fluid level and condition. Refer to " «CHECKING CVT FLUID»(ref-319466-S42267542722009062600000) ". CAUTION: Delete CVT fluid deterioration date with CONSULT-III after changing CVT fluid. Refer to " «CHECK CVT FLUID DETERIORATION DATE»(ref-337628-S35634125062009080600000) ".

CVT Fluid Cooler Cleaning

Whenever a CVT 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 become deposit 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.

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Scheme 59: CVT FLUID COOLER CLEANING PROCEDURE
Scheme 59: CVT FLUID COOLER CLEANING PROCEDURE

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  1. Identify the CVT inlet and outlet fluid cooler hoses.
  2. Position an oil pan under the inlet and outlet cooler hoses.
  3. Disconnect the fluid cooler inlet and outlet rubber hoses from the steel cooler tubes. NOTE: Replace the cooler hoses if rubber material from the hose remains on the tube fitting.
  4. Allow any CVT fluid that remains in the cooler hoses to drain into the oil pan.
  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. Do not breath vapors or spray mist.
  6. 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.
  7. Insert the tip of an air gun into the end of the cooler outlet hose.
  8. Wrap a shop rag around the air gun tip and of the cooler outlet hose.
  9. Blow compressed air regulated to 5 to 9 kg/cm 2 (70 to 130 psi) through the cooler outlet hose for 10 seconds to force out any remaining CVT fluid.
  10. Repeat steps 5 through 9 three additional times.
  11. Position an oil pan under the banjo bolts that connect the CVT fluid cooler steel lines to the transaxle.
  12. Remove the banjo bolts.
  13. Flush each steel line from the cooler side back toward the transaxle by spraying Transmission Cooler Cleaner in a continuous stream for 5 seconds.
  14. Blow compressed air regulated to 5 to 9 kg/cm 2 (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.
  15. Ensure all debris is removed from the steel cooler lines.
  16. Ensure all debris is removed from the banjo bolts and fittings.
  17. Perform " «CVT FLUID COOLER DIAGNOSIS PROCEDURE»(ref-337628-S31776276912009080600000) ".

CVT Fluid Temperature Sensor

If an unexpected signal is sent from the CVT fluid temperature sensor to the TCM, the gear ratio in use before receiving the unexpected signal is maintained or the gear ratio is controlled to keep engine speed under 3500 RPM.

Transmission Fluid Pressure Sensor A (Secondary Pressure Sensor)

  1. If an unexpected signal is sent from the transmission fluid pressure sensor A (secondary pressure sensor) to the TCM, the secondary pressure feedback control is stopped and the offset value obtained before the non-standard condition occurs is used to control line pressure.
  2. If transmission fluid pressure sensor A (secondary pressure sensor) error signal is input to TCM, secondary pressure feedback control stops, but line pressure is controlled normally.

Fluid Leakage and Fluid Level Check

  1. Inspect for fluid leakage and check the fluid level. Refer to " «CHECKING CVT FLUID»(ref-319466-S42267542722009062600000) ".

Inspect the fluid condition.

Fluid statusConceivable causeRequired operation
Varnished (viscous varnish state)Clutch, brake scorchedReplace the CVT fluid and check the CVT main unit and the vehicle for malfunctions (wire harnesses, cooler pipes, etc.)
Milky white or cloudyWater in the fluidReplace the CVT fluid and check for places where water is getting in.
Large amount of metal powder mixed inUnusual wear of sliding parts within CVTReplace the CVT fluid and check for improper operation of the CVT.

FLUID CONDITION CHART

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Scheme 62

Scheme 63

Scheme 63: Stall Test Procedure
Scheme 63: Stall Test Procedure

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  1. Inspect the amount of engine oil. Replenish the engine oil if necessary.
  2. Drive for about 10 minutes to warm up the vehicle so that the CVT fluid temperature is 50 to 80°C (122 to 176°F). Inspect the amount of CVT fluid. Replenish if necessary.
  3. Securely engage the parking brake so that the tires do not turn.
  4. Install a tachometer where it can be seen by driver during test. It is good practice to mark the point of specified engine RPM on indicator .
  5. Start engine, apply foot brake, and place selector lever in "D" position.
  6. While holding down the foot brake, gradually press down the accelerator pedal.
  7. Quickly read off the stall speed, and then quickly remove your foot from the accelerator pedal. CAUTION: Do not hold down the accelerator pedal for more than 5 seconds during this test. Stall speed: 2,600 - 3,150 RPM
  8. Move the selector lever to the "N" position.
  9. Cool down the CVT fluid. CAUTION: Run the engine at idle for at least 1 minute.
  10. Repeat steps 6 through 9 with selector lever in "R" position.

Check CVT Fluid Deterioration Date

"CVTF DETERIORATION DATE"

More than 210000

It is necessary to change CVT fluid.

Less than 210000

It is not necessary to change CVT fluid.

CAUTIONTouch "CLEAR" after changing CVT fluid, and then erase "CVTF DETERIORATION DATE".
  1. Turn ignition switch OFF.
  2. Disconnect CVT unit harness connector.
  3. Check resistance between CVT unit harness connector terminals. RESISTANCE REFERENCE CHART Name Connector Terminal Temperature °C (°F) Resistance (Approx.) CVT fluid temperature sensor F46 17 - 19 20 (68) 6.5 kohms 80 (176) 0.9 kohms
  4. If NG, replace the transaxle assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-337628-S00709375092009080600000) ".
NameConditionCONSULT-III "DATA MONITOR" (Approx.)Resistance (Approx.)
ATF TEMP SEN20°C (68°F)2.0 V6.5 kohms
80°C (176°F)1.0 V0.9 kohms

CVT FLUID TEMPERATURE SENSOR REFERENCE CHART

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