Speedometer & VSS Circuit Test
WARNING: This page is about a different car, the 2002 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
Ensure self-diagnostic systems for ABS, TCS and VDC are functioning properly and that no fault codes exist for these systems. Perform combination meter self-diagnostic check. See ENTERING SELF-DIAGNOSTIC MODE under SELF-DIAGNOSTIC SYSTEM.