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 engine cooling fan speed sensor
• The AC pressure sensor
• The fuel tank pressure (FTP) sensor
• The oil pressure sensor (OPS)

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