Circuit Description

The powertrain control module (PCM) provides a 5-volt reference to the following sensors:

• The throttle position (TP) sensor 1
• The accelerator pedal position (APP) sensor 2
• The AC pressure sensor
• The fuel tank pressure (FTP) sensor

The PCM monitors voltage on the 5-volt reference circuit. If the voltage is higher or lower than required, DTC P0641 will set.