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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 203 (Automatic Transmission (DTC/Circuit Diagnosis) (Re7R01B)) >> DTC/Circuit Diagnosis >> DTC P1721: Vehicle Speed Signal >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OF UNIFIED METER AND A/C AMP. 

    SYMBOL With CONSULT

    Perform "Self Diagnostic Results" in "METER/M&A".

    Is any DTC detected?

    YES

    Check DTC detected item. Refer to DTC Index (TYPE A) or DTC Index (TYPE B). To identify vehicle type, refer to Information .

    NO

    GO TO STEP 2  .

  2. CHECK DTC OF TCM 

    SYMBOL With CONSULT

    Perform "Self Diagnostic Results" in "TRANSMISSION".

    Is any DTC other than "P1721" detected?

    YES

    Check DTC detected item. Refer to DTC Index .

    NO

    Replace the control valve & TCM. Refer to Removal and Installation .