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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Automatic Transmission Diagnosis - Re4F03 Series) >> Diagnostic Tests >> DTC P0731: 1ST Gear Function >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove valve body. See appropriate SERVICING article. Check shift solenoid valve "A" and "B" operation. See appropriate tests under COMPONENT TESTS . Repair or replace shift solenoid valve assembly as needed. After repairs, see DTC CONFIRMATION PROCEDURE . If shift solenoid valves "A" and "B" are okay, go to next step.
  2. Disassemble valve body assembly. See VALVE BODY ASSEMBLY under COMPONENT DISASSEMBLY & REASSEMBLY in appropriate OVERHAUL article. Ensure valves, sleeve and plug slide along valve bore under their own weight, and are free of burrs, dents and scratches. Ensure valve springs are free from damage, deformation and fatigue. Repair valve body assembly as necessary. After repairs, see DTC CONFIRMATION PROCEDURE .
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