Circuit Description

The powertrain control module (PCM) uses the 5-volt reference circuit as a sensor feed to the following sensors:

• The A/C pressure sensor
• The throttle position (TP) sensor 1
• The accelerator pedal position (APP) sensor 2
• The fuel tank pressure (FTP) sensor
• The supercharge inlet pressure (SCIP) sensor
• The barometric pressure (BARO) sensor
• The camshaft position (CMP) sensor

The PCM monitors the voltage on the 5-volt reference circuit. If the voltage is out of tolerance, the PCM will set DTC P0641.