Circuit Description

The supercharger inlet pressure (SCIP) sensor measures both the atmospheric pressure and the vacuum that exists, under different operating conditions, in the supercharger intake plenum. The plenum volume between the throttle body and the supercharger is where this sensor is located, and for the purpose of this diagnostic, this area is considered to be the intake manifold.

The SCIP sensor has the following types of circuits:

• A powertrain control module (PCM) supplied and regulated 5-volt reference circuit
• A PCM supplied ground for the low reference circuit
• A sensor signal circuit that supplies a voltage input to the PCM

The diaphragm within the SCIP sensor responds to the pressure changes in the intake manifold, and provides a signal voltage to the PCM on the signal circuit, relative to those pressure changes.

The PCM monitors the SCIP sensor signal for voltage that is outside of the normal range of a properly operating sensor. If the PCM detects a SCIP sensor signal voltage that is excessively low, DTC P1183 sets.