Circuit Description

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

• The throttle position (TP) sensors 1 and 2
• The accelerator pedal position (APP) sensor 2
• The fuel level sensor 1
• The air conditioning (A/C) refrigerant
• The fuel tank pressure (FTP) sensor
• The engine oil pressure (EOP) sensor

The ECM monitors voltage on the 5-volt reference circuit. If the ECM detects that the voltage on the 5-volt reference circuit is outside a calibrated range, DTC P0651 will set.