2003 Nissan Altima L31 Series Automatic Transaxle Service Manual • PN: 31940, revision date May 2004

2003 Nissan Altima L31 Series Automatic Transaxle Manual

• Covers 2003 Nissan Altima L31 Series automatic transaxles, including QR25DE and VQ35DE engine variants.
• Official Nissan publication (PN: 31940, revised May 2004).
• Over 80 pages of system schematics, diagnostic trouble code definitions, and hydraulic control circuit diagrams.
• Instant download access immediately after purchase—get right to work.
• Fully indexed PDF for quick keyword searches across all chapters and appendices.
• Detailed cross-sectional views of transaxle components for rapid on-the-bench identification.
• Includes factory-authorized CONSULT-II diagnostic procedures for exact DTC troubleshooting.

Diagnostic and System Documentation

This factory publication delivers the exact technical data you need to accurately evaluate the 2003 Altima automatic transaxle. It maps out the unit's internal architecture. You get clear breakdowns of the hydraulic control circuit, clutch and brake engagement patterns, and the Transmission Control Module (TCM) parameters for shift points and line pressure. We know shop time is money. That is why having the functional logic for the shift, overrun clutch, and torque converter clutch solenoids right on your screen saves hours of guesswork. Safety note: High-pressure transmission fluid and complex valve bodies require caution; always observe standard workshop safety protocols before opening the transaxle case.

Technical Reference and Specifications

Stop chasing intermittent electrical issues. The manual outlines confirmed test paths for DTCs ranging from P0705 to U1000, utilizing either CONSULT-II or standard diagnostic equipment. It also provides the hard factory numbers required for precise evaluation. For example, the stall test inspection section lists required revolutions at 2,350–2,800 rpm for QR25DE models and 2,550–3,050 rpm for VQ35DE engines. You will also find exact baseline specs, like the throttle position sensor output (0.5 V for closed-throttle conditions and 4 V for fully-open). These factory baselines eliminate the guesswork from your daily transaxle diagnostics.