S Nissan Sentra Manuals Library
Factory-style information for owners and repair work

Nissan Sentra techinfo

Find Nissan Sentra owner information, maintenance instructions, technical references, service procedures and useful repair pages in one clean online library.

Quick access Sentra Docs
B18 Owner's 2020-2025 Sentra owner information B18 Service 2020-2025 Sentra Workshop manual B17 Owner's 2013-2019 Sentra owner documentation B17 Service 2013-2019 Sentra service information

Nissan Sentra B18 (2020-2025) Service Manual: Dtc/circuit Diagnosis

Eco Mode Switch

Component Function Check

Component Function Check

  1. CHECK ECO MODE SWITCH OPERATION

    1. Ignition switch ON.

    2. Check ECO mode indicator turns ON/OFF on combination meter when turn ECO mode switch ON/OFF.

    Is the inspection result normal?

    YES >>

    Inspection End

    NO >>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK ECO MODE SWITCH CIRCUIT

    1. Turn OFF the headlamp.

    2. Ignition switch OFF.

    3. Disconnect ECO mode switch harness connector.

    4. Ignition switch ON.

    5. Check voltage between ECO mode switch harness connector terminals.

      ECO mode switch

      Voltage

      (Approx.)

      Connector

      +

      -

      Terminal

      M152

      6

      8

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    GO TO 2.

  2. CHECK GROUND CIRCUIT

    1. Ignition switch OFF.

    2. Check the continuity between ECO mode switch harness connector and ground.

      ECO mode switch

      —

      Continuity

      Connector

      Terminal

      M152

      8

      Ground

      Yes

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace harness.

  3. CHECK CIRCUIT BETWEEN BCM AND ECO MODE SWITCH

    1. Disconnect BCM harness connector .

    2. Check continuity between BCM harness connector terminal and ECO mode switch harness connector terminal.

      BCM

      ECO mode switch

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M83

      80

      M152

      6

      Yes

    3. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace harness.

  4. CHECK BCM INPUT/OUTPUT SIGNAL

    1. Connect all of disconnected connectors.

    2. Check input/output signal of BCM. Refer to Reference Value.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident .

    NO >>

    Repair or replace malfunctioning components.

  5. CHECK ECO MODE SWITCH

    Check ECO mode switch. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident .

    NO >>

    Replace ECO mode switch. Refer to Removal and Installation .

Component Inspection

Component Inspection

  1. CHECK ECO MODE SWITCH

    Check continuity between ECO mode switch connector terminals.

    ECO mode switch

    Condition

    Continuity

    Terminal

    6 – 8

    ECO mode switch is depressed.

    Yes

    ECO mode switch is released.

    No

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Replace ECO mode switch. Refer to Removal and Installation .

Eco Mode

Component Function Check

Component Function Check

  1. CHECK ECO MODE OPERATION

    1. Ignition switch ON.

    2. Check ECO mode indicator lamp turns ON/OFF on combination meter when turn ECO mode switch ON/OFF.

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Proceed to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK DTC IN ECM

    CONSULT

    Select “Self Diagnostic Results” mode of “ENGINE”.

    Are any DTC detected?

    YES >>

    Check DTC detected item. Refer to DTC Index.

    NO >>

    GO TO 2.

  2. CHECK DTC IN COMBINATION METER

    CONSULT

    Select “Self Diagnostic Results” mode of “METER/M&A”.

    Is any DTC detected?

    YES >>

    Check DTC detected item. Refer to DTC Index Combination meter (Type A) or DTC Index Combination meter (Type B).

    NO >>

    GO TO 3.

  3. CHECK COMBINATION METER

    CONSULT

    1. Select “Data Monitor” mode of “METER/M&A”.

    2. Check that “ECO MODE IND” turns ON/OFF when ECO mode switch is operated. Refer to Values on the Diagnosis Tool Combination meter (Type A) or Values on the Diagnosis Tool Combination meter (Type B).

    Is the inspection result normal?

    YES >>

    Replace combination meter. Refer to Removal and Installation Combination meter (Type A) or Removal and Installation Combination meter (Type B).

    NO >>

    GO TO 4.

  4. CHECK ECO MODE SWITCH SYSTEM

    Check ECO mode switch system. Refer to Component Function Check.

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Repair or replace malfunctioning components.

    Basic Inspection. Diagnosis and Repair Work Flow
    Diagnosis and Repair Work Flow Work Flow Work Flow OVERALL SEQUENCE DETAILED FLOW GET INFORMATION FOR SYMPTOM Get the detailed information from the customer about the symptom (t...
    Symptom Diagnosis. The Eco Mode Indicator Does Not Turn on
    The Eco Mode Indicator Does Not Turn on Diagnosis Procedure Diagnosis Procedure CHECK ECO MODE OPERATION Ignition switch ON. Check ECO mode indicator lamp turns ON/OFF on combin...

    Other materials:

    Power Supply, Ground & Circuit Elements. Basic Inspection
    Battery How to Handle Battery How to Handle Battery CAUTION: If it becomes necessary to start the engine with a booster battery and jumper cables, use a 12-volt booster battery. After connecting battery cables, ensure that they ...

    Precaution. Precautions
    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”, u ...

    P0171 Fuel Injection System Function
    Dtc Description DTC Description With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculatesthe necessary compensation to corre ...