Nissan Sentra B18 (2020-2025) Service Manual: Precautions

Precaution for Supplemental Restraint System (srs) "air Bag" and "seat Belt Pre-Tensioner"

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collisions.

Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” sections of this Service Manual.

Warning:

Always observe the following items for preventing accidental activation:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision that would result in air bag inflation, it is recommended that all maintenance and repair be performed by an authorized NISSAN/INFINITI dealer.

• Improper repair, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

Warning:

Always observe the following items for preventing accidental activation:

• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition/power switch ON or engine running, never use air or electric power tools or strike near the sensor(s) with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury.

• When using air or electric power tools or hammers, always switch the ignition/power switch OFF, disconnect the 12V battery or batteries, and wait at least 3 minutes before performing any service.

Precaution for Procedure Without Cowl Top Cover

Precaution for Procedure without Cowl Top Cover

When performing the procedure after removing cowl top cover, cover the lower end of windshield with urethane, etc to prevent damage to windshield.

General Precautions

General Precautions

• Turn ignition switch OFF and disconnect the battery cable from the negative terminal before connecting or disconnecting the CVT assembly harness connector. Because battery voltage is applied to TCM even if ignition switch is turned OFF.

  

• When connecting or disconnecting pin connectors into or from TCM, do not damage pin terminals (bend or break).

  

  Check that there are not any bends or breaks on TCM pin terminal, when connecting pin connectors.

• Perform TCM input/output signal inspection and check whether TCM functions normally or not before replacing TCM. Refer to Reference Value.

  

• Perform “DTC (Diagnostic Trouble Code) CONFIRMATION PROCEDURE”.

  

  If the repair is completed DTC should not be displayed in the “DTC CONFIRMATION PROCEDURE”.

• Always use the specified brand of CVT fluid. Refer to Fluids and Lubricants.

• Use lint-free paper not cloth rags during work.

• Dispose of the waste oil using the methods prescribed by law, ordinance, etc. after replacing the CVT fluid.

• Before proceeding with disassembly, thoroughly clean the outside of the transaxle. It is important to prevent the internal parts from becoming contaminated by dirt or other foreign matter.

• Disassembly should be done in a clean work area.

On Board Diagnosis (obd) System of Cvt and Engine

On Board Diagnosis (OBD) System of CVT and Engine

The TCM and ECM have an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the driver of a malfunction causing emission deterioration.

CAUTION:

• Be sure to turn the ignition switch OFF and disconnect the battery cable from the negative terminal before any repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause the MIL to light up.

• Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will cause the MIL to light up due to an open circuit. (Be sure the connector is free from water, grease, dirt, bent terminals, etc.)

• Be sure to route and secure the harnesses properly after work. Interference of the harness with a bracket, etc. may cause the MIL to light up due to a short circuit.

• Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MIL to light up due to a malfunction of the EGR system or fuel injection system, etc.

• Be sure to erase the unnecessary malfunction information (repairs completed) from the TCM and ECM before returning the Nissan Sentra vehicle to the customer.

Removal and Installation Procedure for Cvt Unit Connector

Removal and Installation Procedure for CVT Unit Connector

REMOVAL

Rotate bayonet ring counterclockwise.

Pull out CVT unit harness connector .

INSTALLATION

1. Align marking on CVT unit harness connector terminal with marking on bayonet ring. Insert CVT unit harness connector.

   

2. Rotate bayonet ring clockwise.

3. Rotate bayonet ring clockwise until marking on CVT unit harness connector terminal body is aligned with the slit on bayonet ring as shown in the figure (correctly fitting condition).

   

   CAUTION:

   • Securely align marking on CVT unit harness connector terminal body with bayonet ring slit . Then, be careful not to make a half fit condition as shown in the figure.

     

   • Never mistake the slit of bayonet ring for other dent portion.