Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.

An intermittent TPS output will cause the ECM to receive a false output.

Fig 1: Intake Manifold Tuning Valve Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: Intake Manifold Tuning Valve Flow Chart

Courtesy of GENERAL MOTORS CORP.