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Nissan Sentra B18 (2020-2025) Service Manual: P155b Energy Management Control

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P155B

Energy management control

(Energy management control)

Diagnosis condition

Ignition switch ON

Signal (terminal)

ECM power supply

Threshold

Battery voltage measured by ECM below or above threshold.

Diagnosis delay time

20 seconds or more

POSSIBLE CAUSE

  • Harness or connectors

  • ECM

  • IPDM E/R

  • Battery

  • Generator

FAIL-SAFE

Engine Control System

Not applicable

Idle Start/Stop System

When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.

When ECM detects error while operating the idle start/stop system, ECM restarts the engine.

Confirmation Procedure

Confirmation Procedure

  1. CHECK DTC PRIORITY

    If DTC P155B is displayed with DTC P155E and P155F first perform the trouble diagnosis for DTC P155E andP155F.

    Witch DTC is detected?

    YES >>

    Refer to DTC Index.

    NO >>

    GO TO 2.

  2. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.

    2. Turn ignition switch ON.

    3. Turn ignition switch OFF and wait at least 10 seconds.

    TESTING CONDITION:

    Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

    >>

    GO TO 3.

  3. DTC CONFIRMATION PROCEDURE

    1. 1. Start engine and let it idle for at least 20 seconds.

    2. Check DTC.

    Witch DTC is detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO-2 >>

    Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK CHARGE SYSTEM

    Check charge system. Refer to Work Flow (With 165-DSS-5000P) or Work Flow (Without 165-DSS-5000P).

    Witch DTC is detected?

    YES >>

    INSPECTION END

    NO >>

    Repair or replace the error-detected parts.

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