Circuit Description

WARNING: This page does not describe the selected car, but rather 36 other vehicles, including the 2002 Pontiac Firebird, 2002 Oldsmobile Bravada, 2002 GMC Yukon XL, 2002 GMC Yukon, and 2002 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.

The 2nd gear start switch located on instrument panel, above radio, enables driver to select a 2nd gear start for increased traction during slippery driving conditions. When driver selects 2nd gear, 2nd gear start switch input signal momentarily toggles to zero volts. PCM turns on 2nd gear start mode indicator light located within 2nd gear start switch, and de-energizes 1-2 shift solenoid, enabling 2nd gear.

During light and medium acceleration conditions, vehicle starts in 2nd gear when 2nd gear is selected. However, 2nd gear starts are overridden and 1st gear starts occur if a hard acceleration condition (wide open throttle) is requested. Normal 1st gear start mode is obtained by toggling 2nd gear start switch again, or when ignition switch is cycled off, and then on.