Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 22 other vehicles, including the 1992 GMC Yukon, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.

Disregard Code 23 if SERVICE ENGINE SOON light goes out when throttle is returned to idle.

Fig 1: CODE 23, Schematic, TPS Misadjusted

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 23, Flow Chart, TPS Misadjusted

Courtesy of GENERAL MOTORS CORP.