Automatic Transaxle - RE4F04B: Specifications — Nissan Sentra B15 (1998-2006)

Automatic Transaxle - RE4F04B: Specifications Nissan Sentra B15

Automatic Trans 47 illustrations ~473 words

TORQUE CONVERTER SERVICE

The torque converter should be replaced under any of the following conditions

External leaks in the hub weld area.
Converter hub is scored or damaged.
Converter pilot is broken, damaged or fits poorly into crankshaft.
Steel particles are found after flushing the cooler and cooler lines.
Pump is damaged or steel particles are found in the converter.
Vehicle has TCC shudder and/or no TCC apply. Replace only after all hydraulic and electrical diagnoses have been made. (Converter clutch material may be glazed.)
Converter is contaminated with engine coolant containing antifreeze.
Internal failure of stator roller clutch.
Heavy clutch debris due to overheating (blue converter).
Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are worn or damaged - indicates that lining material came from converter. The torque converter should not be replaced if
The fluid has an odor, is discolored, and there is no evidence of metal or clutch facing particles.
The threads in one or more of the converter bolt holes are damaged.
Transaxle failure did not display evidence of damaged or worn internal parts, steel particles or clutch plate lining material in unit and inside the fluid filter.
Vehicle has been exposed to high mileage (only). The exception may be where the torque converter clutch dampener plate lining has seen excess wear by vehicles operated in heavy and/or constant traffic, such as taxi, delivery or police use.

Torque Converter Clutch Solenoid Valve Control

The torque converter clutch solenoid valve is controlled by the TCM. The plunger closes the drain circuit during the OFF period, and opens the circuit during the ON period. If the percentage of OFF-time increases in one cycle, the pilot pressure drain time is reduced and pilot pressure remains high.

Scheme 980

Scheme 980: Torque Converter Clutch Solenoid Valve Control

The torque converter clutch piston is designed to slip to adjust the ratio of ON-OFF, thereby reducing lock-up shock.

OFF-time INCREASING --> Amount of drain DECREASING --> Pilot pressure HIGH --> Lock-up RELEASING

Scheme 981

Scheme 982

Scheme 982: Torque Converter Clutch Control Valve Operation

General Specifications

Engine		QR25DE
Automatic transaxle model		RE4F04B
Automatic transaxle assembly	Model code number	85X63
Transaxle gear ratio	1st	2.785
	2nd	1.545
	3rd	1.000
	4th	0.694
	Reverse	2.272
	Final drive	4.087
Recommended fluid		Nissan Matic "D" (Continental U.S. and Alaska) or Canada Nissan Automatic Transmission Fluid (1)
Fluid capacity l (US qt, Imp qt)		8.5 (9, 7.5)
(1) Refer to MA-13. "RECOMMENDED FLUIDS AND LUBRICANTS" .

(1)	Refer to MA-13. "RECOMMENDED FLUIDS AND LUBRICANTS" .

General Specifications

Scheme 983

Scheme 983: VEHICLE SPEED WHEN SHIFTING GEARS THROTTLE POSITION

Scheme 984

Scheme 984: VEHICLE SPEED WHEN PERFORMING AND RELEASING LOCK-UP

Note. Lock-up vehicle speed indicates the speed in D4 (O/D ON) position. Perform Lock-up inspection after warming up engine. Lock-up vehicle speed may vary depending on the driving conditions and circumstances.