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HOMESERVICE MANUALSNISSAN-DATSUN2024FRONTIER SL, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (DTC/CIRCUIT DIAGNOSIS) (1 OF 6)DTC/CIRCUIT DIAGNOSISDTC B1902: DC/DC CONVERTERDTC DESCRIPTION
2024 Nissan-Datsun Frontier SL, RWD

DTC Description

2024 Nissan-Datsun Frontier SL, RWDSECTION DTC Description

DTC DETECTION LOGIC 

DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition
B1902-00 DC/DC CONVERTER (DC/DC converter power supply output 1 circuit) Diagnosis condition -
Signal (terminal) -
Threshold DC/DC converter detects power supply output 1 is 5.0 V or less when restart the engine.
Diagnosis delay time -

POSSIBLE CAUSE 

  • Harness and connectors (DC/DC converter circuit is open or shorted.)
  • DC/DC converter
  • Component power - supplied from DC/DC output 1

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.

DTC CONFIRMATION PROCEDURE 

  1. 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.

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE 

    SYMBOL With CONSULT

    1. Start the engine and warm it up to normal operating temperature.
    2. Select "AUTO STOP START" in "ACTIVE TEST" mode of "ENGINE" with CONSULT.
    3. Touch "START" and operate idle start/stop system. (Stop the engine.)
    4. Touch "CANCEL" and restart the engine.
    5. Check 1st trip DTC.

    Is 1st trip DTC detected?

    >>

    Proceed to Diagnosis Procedure .

    >>

    INSPECTION END

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • 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.