Description & Operation: Introduction

WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.

Transaxle consists of 4 main units: automatic transaxle, torque converter, differential assembly with a viscous coupling (RE4F03W) or without a viscous coupling (RE4F03B) and Transaxle Control Module (TCM). The TCM electrically controls shifting functions. Internal transaxle components include forward clutch, forward one-way clutch, high clutch, low and reverse brake, overrun clutch, reverse clutch, brake band, band servo, accumulators and control valve (valve body) assembly.

The RE4F03B/W automatic transaxle is electronically controlled. Transaxle shifting and torque converter lock-up is controlled by the Transmission Control Module (TCM) for optimal performance. The TCM receives information from various input devices and uses this information to control shift and lock-up solenoid valves (output devices).

The following electronic signals, sensors, switches and solenoids are used to control transaxle shifting.

Engine Revolution Signal (Tach Signal)
Transmission Fluid Temperature (TFT) Sensor
Park/Neutral Position (PNP) Switch
Line Pressure Solenoid
Lock-Up Solenoid
Overdrive Switch
Overrun Clutch Solenoid
Mainshaft Revolution Sensor
Shift Solenoids "A" & "B"
Speed Sensor
Throttle Position (TP) Sensor With Integral Switch
Shift Lock System