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