2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Components Function

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
COMPONENTS FUNCTION

Component parts Function
Transfer control unit Controls transfer control device and switches 4H-4LO under 4WD condition and 2WD-4WD.
Transfer control device Actuator motor and actuator position switch are integrated so as to switch driving types.
Actuator motor Controls shift rods by signals from transfer control unit.
Actuator position switch Detects actuator motor position.
Wait detection switch Detects if transfer is under 4WD condition.
4LO switch Detects if transfer is under 4LO condition.
ATP switch (A/T models) Detects if transfer is under neutral condition.
4WD shift switch Able to select from 2WD, 4H or 4LO.
4WD warning lamp
  • Illuminates if malfunction is detected in electrical system of 4WD system.
  • There is 1 blink in 2 seconds if rotation difference of front wheels and rear wheels is large.
ATP warning lamp (A/T models) Indicates that A/T parking mechanism does not operate when A/T selector lever is in "P" position and transfer is under neutral condition.
4WD shift indicator lamp Displays driving condition selected by 4WD shift switch.
4LO indicator lamp Displays 4LO condition.
PNP switch (M/T models) Detects if manual transmission is under neutral condition.
ABS actuator and electric unit (control unit) Transmits the following signals via CAN communication to Transfer control unit.
  • Vehicle speed signal
  • Stop lamp switch signal (brake signal)
TCM (A/T models) Transmits the following signal via CAN communication to Transfer control unit.
  • Output shaft revolution signal
  • A/T position indicator signal (PNP switch signal)
ECM Transmits engine speed signal via CAN communication to Transfer control unit.
Factory Service Tools

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  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.