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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Automatic Transmission Diagnosis - Re4R01A) >> Diagnostic Tests >> DTC P0734: 4TH Gear Function >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Infiniti QX4, 2001 Nissan Pathfinder, and 2001 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform road test procedure. See ROAD TEST  under PERFORMANCE TESTS. If transmission did not shift from 3rd to 4th gear at specified speed during cruise test, go to next step. If transmission did shift from 3rd to 4th gear at specified speed, see DTC CONFIRMATION PROCEDURE .
  2. Perform line pressure test. See HYDRAULIC PRESSURE TESTS  under PERFORMANCE TESTS. If pressure is not within specification go to step  6. If okay, go to next step.
  3. Check shift solenoid valves. See SOLENOID VALVES  under COMPONENT TESTS. Check solenoid valve assembly operation. Repair or replace as necessary. If okay, go to next step.
  4. Disassemble valve body assembly. See 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 control valve springs are free from damage, deformation and fatigue. Ensure hydraulic line is not plugged. Repair valve body assembly as necessary. After repair, go to next step.
  5. Road test vehicle. If 3-4 shift is at specified speed, see DTC CONFIRMATION PROCEDURE .
  6. Remove valve body assembly. See appropriate SERVICING article. Check line pressure solenoid valve. See SOLENOID VALVES  under COMPONENT TESTS. Replace as necessary. If okay, go to next step.
  7. Disassemble valve body assembly. See appropriate OVERHAUL article. Check line pressure circuit valves for sticking (pressure regulator valve, pilot valve and pressure modifier valve). After repairs, go to next step.
  8. Road test vehicle. If 3-4 shift is at specified speed, see DTC CONFIRMATION PROCEDURE . If 3-4 shift is not at specified speed, go to step  1.
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