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Home >> Infiniti >> 2003 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1574: ASCD Vehicle Speed Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. Check for A/T system DTCs. If problem is found, diagnose A/T system. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If problem is not found, go to next step.
  2. Check speedometer operation. If speedometer operates normally, go to next step. If speedometer does not operate normally, repair speedometer or vehicle speed sensor circuit. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
  3. Turn ignition off. Disconnect ECM harness connector. See Figure . Remove instrument cluster. Check continuity of Pink/Blue wire between instrument cluster harness connector M32 terminal No. 32 and ECM harness connector terminal No. 68. See Figure and Figure . Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step  5 .
  4. Check the following:
    • Check for poor connection at White, 18-pin harness connector F66 terminal No. 2 (Pink/Blue wire). See Figure . Connector is located under instrument panel. See Figure .
    • Check for open or short between instrument cluster and ECM.
    Repair as necessary.
  5. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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