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Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Automatic Transmission) >> DTC/Circuit Diagnosis >> DTC P1721: Vehicle Speed Signal >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. 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. 

    With CONSULT 

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

    Is any DTC detected? 

    YES: Check DTC detected item. Refer to "DTC INDEX ".

    NO: GO TO 2.

  2. CHECK DTC OF TCM 

    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: GO TO 3.

  3. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace control valve & TCM. Refer to "EXPLODED VIEW ".

    NO: Repair or replace damaged parts.

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