No Engine Braking In "1" Position
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.
Possible cause: misadjusted or damaged PNP switch, control linkage or TP sensor. Faulty revolution sensor or VSS signal. Damaged overrun clutch solenoid, shift solenoid valve "A" or "B", valve body assembly, low and reverse brake, or overrun clutch.