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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 P0734: 4TH 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. If during road test, transaxle did not shift from 3rd to 4th gear at specified speed, go to next step. If shift from 3rd to 4th gear is at specified speed, see DTC CONFIRMATION PROCEDURE .
  2. Perform line pressure test. See HYDRAULIC PRESSURE TESTS  under PERFORMANCE TESTS. If line pressure is not within specification, go to step  4. If line pressure is okay, remove valve body assembly. See appropriate SERVICING article. Check solenoid valve assembly operation. See appropriate tests under COMPONENT TESTS . Repair as necessary. If okay, go to next step.
  3. 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. Ensure hydraulic line is free from obstacles. Repair as necessary. After repairs, see DTC CONFIRMATION PROCEDURE .
  4. Remove valve body assembly. See appropriate SERVICING article. Check line pressure solenoid valve. See LINE PRESSURE SOLENOID VALVE  under COMPONENT TESTS. Repair or replace solenoid valve assembly as needed. If line pressure solenoid is okay, disassemble valve body assembly. See VALVE BODY ASSEMBLY under COMPONENT DISASSEMBLY & REASSEMBLY in appropriate OVERHAUL article. Check pressure regulator, pilot and pressure modifier valves for sticking. Repair as necessary. After repairs, see DTC CONFIRMATION PROCEDURE .
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