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Home >> Infiniti >> 2004 >> I35 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle >> DTC P0731: A/T 1ST Gear Function >> Diagnostic Procedure >> 3 Check Control Valve

3 Check Control Valve

  1. Disassemble control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS " .
  2. Check to ensure that:
    • Valve, sleeve and plug slide along valve bore under their own weight.
    • Valve, sleeve and plug are free from burrs, dents and scratches.
    • Control valve springs are free from damage, deformation and fatigue.
    • Hydraulic line is free from obstacles.
Fig 1: Identifying Control Valve Assembly
G00792384Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 4.

NG: Repair control valve assembly.