SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSNISSAN-DATSUN2024FRONTIER SL, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (DTC/CIRCUIT DIAGNOSIS) (5 OF 6)DTC/CIRCUIT DIAGNOSISDTC P1603: ECMDTC DIAGNOSIS PROCEDURE
2024 Nissan-Datsun Frontier SL, RWD

DTC Diagnosis Procedure

2024 Nissan-Datsun Frontier SL, RWDSECTION DTC Diagnosis Procedure
  1. INSPECTION START 

    Check that the battery negative terminal is not disconnected during ignition switch ON.

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    GO TO 2.

  2. ERASE DTC 
    1. Start the engine and let it idle at least 10 seconds.
    2. Turn ignition switch OFF.
    3. Repeat steps 1 and 2 for 4 times.
    4. Erase DTC.
    5. Turn ignition switch OFF and wait at least 10 seconds.
    6. Start the engine and let it idle for 10 seconds.
    7. Check 1st trip DTC.

    Is DTC P1603 detected again?

    YES>>

    Replace ECM. Refer to Removal and Installation .

    NO>>

    INSPECTION END

  3. CHECK ECM POWER SUPPLY AND GROUND CIRCUIT 

    Check ECM power supply and ground circuit. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair or replace error-detected parts.

  4. CHECK INTERMITTENT INCIDENT 

    Check intermittent incident. Intermittent Incident .

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    Repair or replace error-detected parts.

  5. PERFORM DTC CONFIRMATION PROCEDURE 
    1. Turn ignition switch ON.
    2. Erase DTC.
    3. Perform confirmation procedure. Refer to DTC Confirmation Procedure .

    Is the DTC P1603 detected again?

    YES>>

    Replace ECM. Refer to Removal and Installation .

    NO>>

    INSPECTION END

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.